Illumination device with inclined light emitting element disposed on a transparent substrate

A semiconductor light emitting element includes a transparent substrate and a plurality of light emitting diode (LED) structures. The transparent substrate has a support surface and a second main surface disposed opposite to each other. At least some of the LED structures are disposed on the support surface and form a first main surface where light emitted from with a part of the support surface without the LED structures. Each of the LED structures includes a first electrode and a second electrode. Light emitted from at least one of the LED structures passes through the transparent substrate and emerges from the second main surface. An illumination device includes the semiconductor light emitting element and a supporting base. The semiconductor light emitting element is disposed on the supporting base, and an angle is formed between the semiconductor light emitting element and the supporting base.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a semiconductor light emitting element and an illumination device thereof, and more particularly, to a semiconductor light emitting element providing light in multi-directions, and an illumination device including the semiconductor light emitting element.

2. Description of the Prior Art

A light beam emitted from a light emitting diode (LED) is a kind of directional light source, which is different from a dispersive light source of a conventional bulb. Accordingly, applications of LED are limited. For instance, the conventional LED cannot or may be hard to provide required lighting effect for indoor and outdoor illumination applications. Additionally, conventional LED illumination devices emit light beams from a single side and luminous efficiency of the conventional LED illumination device is relatively low accordingly.

SUMMARY OF THE INVENTION

It is one of the objectives of the present invention to provide a semiconductor light emitting element providing light in multi-directions, an illumination device including the semiconductor light emitting element, and a device frame of the illumination device. The purposes of luminous efficiency enhancement, light shape improvement, and cost reduction may then be achieved.

A preferred embodiment of the present invention provides a semiconductor light emitting element. The semiconductor light emitting element includes a transparent substrate and a plurality of light emitting diode (LED) structures. The transparent substrate has a support surface and a second main surface disposed opposite to each other. At least some of the LED structures are disposed on the support surface and form a first main surface where light emitted from with at least a part of the support surface without the LED structures. Each of the LED structures includes a first electrode and a second electrode. Light emitted from at least one of the LED structures passes through the transparent substrate and emerges from the second main surface.

A preferred embodiment of the present invention provides an illumination device. The illumination device includes at least one semiconductor light emitting element and a supporting base. The semiconductor light emitting element includes a transparent substrate and a plurality of LED structures. The transparent substrate has a support surface and a second main surface disposed opposite to each other. At least some of the LED structures are disposed on the support surface and form a first main surface where light emitted from with at least a part of the support surface without the LED structures. Each of the LED structures includes a first electrode and a second electrode. Light emitted from at least one of the LED structures passes through the transparent substrate and emerges from the second main surface. The semiconductor light emitting element is disposed on the supporting base, and a first angle may exist between the semiconductor light emitting element and the supporting base.

Another preferred embodiment of the present invention provides a semiconductor light emitting element. The semiconductor light emitting element includes a transparent substrate and at least one LED structure. The transparent substrate has a support surface and a second main surface disposed opposite to each other. The LED structure is disposed on the support surface and forms a first main surface where light emitted from with at least a part of the support surface without the LED structure. The LED structure includes a first electrode and a second electrode. The LED structure has a beam angle greater than 180 degrees, and at least a part of light beams emitted from the LED structure pass through the transparent substrate and emerge from the second main surface.

Another preferred embodiment of the present invention provides a semiconductor light emitting element. The semiconductor light emitting element includes a transparent substrate and at least one LED structure. A material of the transparent substrate includes sapphire, and the transparent substrate has a support surface and a second main surface disposed opposite to each other. The LED structure is disposed on the support surface The LED structure has a beam angle greater than 180 degrees. At least a part of light beams emitted from the LED structure pass through the transparent substrate and emerge from the second main surface.

Another preferred embodiment of the present invention provides a semiconductor light emitting element. The semiconductor light emitting element includes a transparent substrate, at least one LED structure and a wavelength conversion layer. The transparent substrate has a support surface and a second main surface disposed opposite to each other. The LED structure is disposed on the support surface and forms a first main surface where light emitted from with at least a part of the support surface without the LED structure. The LED structure has a beam angle greater than 180 degrees, and at least apart of light beams emitted from the LED structure pass through the transparent substrate and emerge from the second main surface. The wavelength conversion layer is at least disposed on the LED structure or the second main surface. The wavelength conversion layer at least partially absorbs a light beam emitted from the LED structure and coverts the light beam into another light beams having different wavelength range.

Another preferred embodiment of the present invention provides a semiconductor light emitting element. The semiconductor light emitting element includes a transparent substrate and a plurality of LED structures. The transparent substrate has a support surface and a second main surface disposed opposite to each other. The LED structures are disposed on the support surface. A light emitting surface of each LED structure uncovered by the transparent substrate and at least a part of the support surface without the LED structures form a first main surface where light emitted from. Each of the LED structures has a beam angle greater than 180 degrees. Light emitted from at least one of the LED structures passes through the transparent substrate and emerges from the second main surface. An area of the first main surface or an area of the second main surface is larger than 5 times of a total area formed from at least one of the light emitting surfaces of each LED structure.

Another preferred embodiment of the present invention provides a semiconductor light emitting element. The semiconductor light emitting element includes a transparent substrate, at least one diamond-like carbon (DLC) film, and at least one LED structure. The transparent substrate has a support surface and a second main surface disposed opposite to each other. The DLC film is disposed on the transparent substrate. The LED structure is disposed on the support surface. A light emitting surface of the LED structure uncovered by the transparent substrate and at least a part of the support surface without the LED structure forma first main surface where light emitted from. The LED structure has a beam angle greater than 180 degrees, and at least a part of light beams emitted from the LED structure pass through the transparent substrate and emerge from the second main surface.

Another preferred embodiment of the present invention provides a semiconductor light emitting element. The semiconductor light emitting element includes a transparent substrate, at least one LED structure and a reflector. The transparent substrate has a support surface and a second main surface disposed opposite to each other. The reflector is disposed on the second main surface. The LED structure is disposed on the support surface. A light emitting surface of the LED structure uncovered by the transparent substrate and at least a part of the support surface without the LED structure form a first main surface where light emitted from. The LED structure has a beam angle greater than 180 degree.

Another preferred embodiment of the present invention provides a semiconductor light emitting element. The semiconductor light emitting element includes a transparent substrate, at least one LED structure, a first connecting electrode and a second connecting electrode. The transparent substrate has a support surface and a second main surface disposed opposite to each other. The LED structure is disposed on the support surface and forms a first main surface where light emitted from with at least a part of the support surface without the LED structure. The LED structure has a beam angle greater than 180 degrees, and at least a part of light beams emitted from the LED structure pass through the transparent substrate and are emitted from the second main surface. The first connecting electrode and the second connecting electrode are respectively disposed on different sides of the transparent substrate. The first connecting electrode and the second connecting electrode are electrically connected to the LED structure.

Another preferred embodiment of the present invention provides an illumination device. The illumination device includes a semiconductor light emitting element and a support. The semiconductor light emitting element includes a transparent substrate, at least one LED structure, a first connecting electrode and a second connecting electrode. The transparent substrate has a support surface and a second main surface disposed opposite to each other. The LED structure is disposed on the support surface and forms a first main surface where light emitted from with at least a part of the support surface without the LED structure. The LED structure has a beam angle greater than 180 degrees, and at least a part of light beams emitted from the LED structure pass through the transparent substrate and are emitted from the second main surface. The first connecting electrode and the second connecting electrode are respectively disposed on different sides of the transparent substrate. The first connecting electrode and the second connecting electrode are electrically connected to the LED structure. The support includes at least one opening, and the semiconductor light emitting element is disposed correspondingly to the opening.

Another preferred embodiment of the present invention provides an illumination device. The illumination device includes a plurality of semiconductor light emitting elements and a device frame. Each of the semiconductor light emitting elements includes a transparent substrate, at least one LED structure, a first connecting electrode and a second connecting electrode. The transparent substrate has a support surface and a second main surface disposed opposite to each other. The LED structure is disposed on the support surface and forms a first main surface where light emitted from with at least a part of the support surface without the LED structure. The LED structure has a beam angle greater than 180 degrees, and at least a part of light beams emitted from the LED structure pass through the transparent substrate and are emitted from the second main surface. The first connecting electrode and the second connecting electrode are respectively disposed on different sides of the transparent substrate. The first connecting electrode and the second connecting electrode are electrically connected to the LED structure. The device frame includes a supporting base and a plurality of supports extending outward from the supporting base. Each of the supports includes at least one opening, and the semiconductor light emitting elements are disposed correspondingly to at least some of the openings.

Another preferred embodiment of the present invention provides an illumination device. The illumination device includes a plurality of semiconductor light emitting elements and a light bar. Each of the semiconductor light emitting elements includes a transparent substrate, at least one LED structure, a first connecting electrode and a second connecting electrode. The transparent substrate has a support surface and a second main surface disposed opposite to each other. The LED structure is disposed on the support surface and forms a first main surface where light emitted from with at least a part of the support surface without the LED structure. The LED structure has a beam angle greater than 180 degrees, and at least a part of light beams emitted from the LED structure pass through the transparent substrate and are emitted from the second main surface. The first connecting electrode and the second connecting electrode are respectively disposed on different sides of the transparent substrate. The first connecting electrode and the second connecting electrode are electrically connected to the LED structure. The light bar includes a plurality of openings. The light bar has an extending direction, and the openings are disposed along the extending direction. The semiconductor light emitting elements are disposed correspondingly to at least some of the openings.

Another preferred embodiment of the present invention provides an illumination device. The illumination device includes a plurality of semiconductor light emitting elements and a supporting base. Each of the semiconductor light emitting elements includes a transparent substrate, at least one LED structure, a first connecting electrode and a second connecting electrode. The transparent substrate has a support surface and a second main surface disposed opposite to each other. The LED structure is disposed on the support surface and forms a first main surface where light emitted from with at least a part of the support surface without the LED structure. The LED structure has a beam angle greater than 180 degrees, and at least a part of light beams emitted from the LED structure pass through the transparent substrate and are emitted from the second main surface. The first connecting electrode and the second connecting electrode are respectively disposed on different sides of the transparent substrate. The first connecting electrode and the second connecting electrode are electrically connected to the LED structure. The supporting base includes a plurality of openings. The openings are disposed as an array. The semiconductor light emitting elements are disposed correspondingly to at least some of the openings.

Another preferred embodiment of the present invention provides an illumination device. The illumination device includes at least one light emitting element, a supporting base and at least one support. The light emitting element is disposed on the support, and the support is coupled to the supporting base. The support is inclined that at least a part of the support is more near to a central axis of the supporting base. At least a part of the support is inclined inward or outward relative to the central axis of the supporting base, and a first angle between the light emitting element and the supporting base may range from 45 degrees to 75 degrees, such that the luminance of the light illumination device near to the central axis of the supporting base is increased.

Another preferred embodiment of the present invention provides an illumination device. The illumination device includes at least one light emitting element, a supporting base and at least one support. The support includes a first connected portion and a second connected portion. One end of the second connected portion is disposed on the supporting base, and the other end of the second connected portion is connected to one end of the first connected portion. The light emitting element is disposed on the other end of the first connected portion. The first connected portion extends inward or outward relative to a central axis of the supporting base and is rotatably connected to the second connected portion. The second connected portion is rotatable relative to the supporting base. A second angle exists between the first connected portion and the second connected portion ranges for increasing the luminance near to the central axis. A third angle between the second connected portion and the supporting base ranges from 45 degrees to 85 degrees for increasing the luminance near to the central axis.

Another preferred embodiment of the present invention provides an illumination device. The illumination device includes at least one light emitting element, a supporting base and at least one support. The support is flexible to form an arc-shaped structure, a parabolic structure or an ellipse-shaped structure. The illumination device is a crystal lamp.

Another preferred embodiment of the present invention provides a device frame of an illumination device. The device frame includes a supporting base and a plurality of supports. Each of the supports extends from the supporting base. Each of the supports includes at least one opening and a plurality of electrodes disposed on two sides of the opening.

In the illumination device of the present invention, the LED structure is fixed on the transparent substrate, and the transparent substrate allows the light beam emitted by the LED structure passing through. Accordingly, the illumination device in the present invention can emit light in at least multi-directions or all directions. The luminous efficiency of the illumination device may be accordingly enhanced, and the light shape of the LED illumination device may also be improved.

DETAILED DESCRIPTION

Please refer toFIG. 1andFIG. 2.FIG. 1andFIG. 2are schematic structure diagrams illustrating a semiconductor light emitting element according to a preferred embodiment of the present invention. As shown inFIG. 1andFIG. 2, a semiconductor light emitting element1includes a transparent substrate2, a support surface210, a first main surface21A, a second main surface21B and at least one light emitting diode (LED) structure3providing light in multi-directions. The transparent substrate2, which is a sheet type substrate, has two main surfaces, and one of the surfaces is the support surface210. The LED structure3capable of emitting light is disposed on the support surface210. A light emitting surface34of the LED structure3uncovered by the transparent substrate2and at least a part of the support surface210without the LED structure form the first main surface21A where light emitted from. The second main surface21B is another main surface of the transparent substrate2without the LED structures3. The disposition described above may also be reversed, or the LED structure3may be disposed on the two surfaces of the transparent substrate2. In one embodiment, LED structures3may be disposed on the support surface210of the transparent substrate2interlacedly corresponding to other LED structures3disposed on the second main surface21B, such that light beams emitted from LED structures3on one surface of the transparent substrate2would not be blocked by other LED structures3on another surface of the transparent substrate2. The luminance of the semiconductor light emitting element1may be increased accordingly. A material of the transparent substrate2, such as sapphire, ceramic, glass, plastic, rubber or etc., may comprise one selected from aluminum oxide (Al2O3), magnesium oxide, beryllium oxide, yttrium oxide, thorium dioxide, zirconium dioxide, lead zirconium titanate, gallium arsenide, zinc sulfide, zinc selenide, calcium fluoride, magnesium fluoride, silicon carbide (SiC) or polymer. Preferably, the transparent substrate may be a sapphire substrate in a preferred embodiment of the present invention. The structure of the sapphire substrate is substantially single crystal. The sapphire substrate has properties of higher light transmittance and better heat dissipation capability. The sapphire substrate may be used to increase the life time of the semiconductor light emitting element1. However, the conventional sapphire substrate used for growing a conventional light emitting diode may be fragile when applied in the present invention. According to experiment results of the present invention, the transparent substrate2of the present invention is preferably a sapphire substrate having a thickness thicker than or equal to 200 micrometers so as to perform better reliability, supporting performance and transparency. For effectively emitting light in multi-directions, including dual-directions or full directions, from the semiconductor light emitting element1, the LED structure3in this invention preferably has a beam angle greater than 180 degrees. Accordingly, the LED structure3disposed on the transparent substrate2may emit light beams from the light emitting surface34toward a direction away from the transparent substrate2, and the LED structure3may also emit light beams at least partially entering the transparent substrate2. The light beams entering the transparent substrate2may emerge from the second main surface21B opposite to the first main surface21A, and the light beams entering the transparent substrate2may also be emitted from a part of the support surface210without LED structures3or emitted from other surface of the transparent substrate2. The semiconductor light emitting element1may then be capable of emitting light in multi-directions including dual-directions or full directions. In this invention, an area of the first main surface21A or an area of the second main surface21B is larger than 5 times of a total area formed from at least one of the light emitting surfaces34of each LED structure, and this is a preferred proportion according to the consideration of both the luminous efficiency and the heat dissipation performance.

Additionally, in another preferred embodiment of the present invention, a difference in color temperatures of light beams emitted from the first main surface21A and the second main surface21B is smaller than or equal to 1500K so as to uniform light emitting effects of the semiconductor light emitting element1. In addition, under the thickness condition of the transparent substrate2mentioned above, a light transmittance of the transparent substrate3is larger than or equal to 70% for light beams having a wavelength range larger than or equal to 420 nanometers, or light beams having a wavelength rage smaller than or equal to 470 nanometers.

The present invention is not limited to the embodiment described above. The following description will detail the different embodiments in the present invention. To simplify the description, similar components in each of the following embodiments are marked with identical symbols. For making it easier to understand the differences between the embodiments, the following description will detail the dissimilarities among different embodiments and the identical features will not be redundantly described.

Please refer toFIGS. 3-5. In the present invention, the LED structure3includes a first electrode31A and a second electrode31B for receiving electricity. The first electrode31A and the second electrode31B are respectively and electrically connected to a first connecting conductor23A and a second connecting conductor23B on the transparent substrate2.FIGS. 3-5are schematic diagrams illustrating different types of electrically coupling approaches between the light emitting diode structure3and the conductors.FIG. 3illustrates a horizontal type LED structure, the LED structure3is formed on the support surface210of the transparent substrate2, and the electrodes31A and31B are coupled to the connecting conductors23A and23B by wire bonding.FIG. 4illustrates a flip chip type LED structure3, and the LED structure3is disposed reversely and electrically coupled to the transparent substrate2by the first electrode31A and the second electrode31B. The first electrode31A and the second electrode31B may be directly coupled to the first connecting conductor23A and the second connecting conductor23B by welding or adhering. As shown inFIG. 5, the first electrode31A and the second electrode31B are disposed on different surfaces of the LED structure3, and the LED structure3is vertically disposed so as to respectively connect the electrodes31A and31B to the connecting conductors23A and23B.

Please refer toFIG. 6andFIG. 7. The semiconductor light emitting element1in the present invention may further include a wavelength conversion layer4. The wavelength conversion layer4may be selectively disposed on the first main surface21A or/and the second main surface21B, or directly on the LED structures3. The wavelength conversion layer4may directly contact the LED structures3, or the wavelength conversion layer4may be separated from the LED structures3by a distance without directly contact. The wavelength conversion layer4contains at least one kind of fluorescent powders such as organic fluorescent powder or inorganic fluorescent powder of garnet series, sulfate series or silicate series. The wavelength conversion layer4may then be able to at least partially absorb a light beam emitted from the LED structure3and covert the light beam into another light beams having different wavelength range. For example, when blue light beams are emitted from the LED structure3, a part of the blue light beams may be converted into yellow light beams by the wavelength conversion layer4, and the blue light beams and the yellow light beams may be mixed for presenting white light beams emitted from the semiconductor light emitting element1. Additionally, a luminance of the first main surface21A is different from a luminance of the second main surface21B because a light source of the first main surface21A mainly comes from light beams directly emitted from the LED structure3, and a light source of the second main surface21B comes from light beams passing through the transparent substrate2. Therefore, in a semiconductor light emitting element1of another preferred embodiment, concentrations of the fluorescent powders in the wavelength conversion layer4disposed on the first main surface21A and the wavelength conversion layer4disposed on the second main surface21B are arranged correspondingly. Preferably, a ratio of a fluorescent powder concentration in the wavelength conversion layer4disposed on the first main surface21A to a fluorescent powder concentration in the wavelength conversion layer4disposed on the second main surface21B may ranges from 1:0.5 to 1:3, or a ratio of the fluorescent powder concentration in the wavelength conversion layer4disposed on the second main surface21B to the fluorescent powders in the wavelength conversion layer4disposed on the first main surface21A may ranges from 1:0.5 to 1:3. The luminance and the lighting effect of the semiconductor light emitting element1may become more appropriate for different applications accordingly. A difference in color temperatures of light beams emitted from the first main surface21A and the second main surface21B may then be controlled to be smaller than or equal to 1500K. A wavelength converting efficiency and light emitting performance of the semiconductor light emitting element1may then be enhanced.

Please refer toFIG. 8.FIG. 8is a cross-sectional diagram illustrating a semiconductor light emitting element1according to another preferred embodiment of the present invention. As shown inFIG. 8, the semiconductor light emitting element1in this embodiment includes a transparent substrate2and at least one LED structure14providing light in multi-directions. The transparent substrate2has a support surface210and a second main surface21B, or a bottom surface, disposed opposite to each other. The LED structure14is disposed on the support surface210, or a covered surface of the support surface210, of the transparent substrate2. The LED structure14includes a first electrode16and a second electrode18. The first electrode16and the second electrode18are configured to be electrically connected to other devices. A light emitting surface34of the LED structure14uncovered by the transparent substrate2and at least a part of the support surface210without the LED structure14form a first main surface21A, or an uncovered surface, where light emitted from.

The LED structure14may include a substrate141, an N-typed semiconductor layer142, an active layer143and a P-typed semiconductor layer144. In this embodiment, the substrate141of the LED structure14may be attached on the transparent substrate2by such as a chip bonding layer28. Apart from being used to attach the LED structure14, a light intensity may also be increased by optimizing the material property of the chip bonding layer28. For example, a refractive index of the chip bonding layer28is preferably between a refractive index of the substrate141and a refractive index of the transparent substrate2so as to increase the intensity of light emitted from the LED structure14. In addition, the chip bonding layer28may be a transparent adhesive or other appropriate bonding material. The first electrode16and the second electrode18are disposed on the side of the LED structure14opposite to the chip bonding layer28. The first electrode16and the second electrode18are electrically connected to the P-typed semiconductor layer144and the N-typed semiconductor layer142respectively (FIG. 8does not show the connecting relation between the second electrode18and the N-typed semiconductor layer142). Horizontal level of an upper surface of the first electrode16and an upper surface of the second electrode18are substantially the same. The first electrode16and the second electrode18may be metal electrodes, but not limited thereto. In addition, the semiconductor light emitting element1further includes a first connecting conductor20, a second connecting conductor22and a wavelength conversion layer4. The first connecting conductor20and the second connecting conductor22are disposed on the transparent substrate2. The first connecting conductor20and the second connecting conductor22may be metal wires or other conductive patterns, but not limited thereto. The first electrode16and the second electrode18are respectively connected to the first connecting conductor20and the second connecting conductor22electrically by wire bonding or welding, but not limited thereto. The wavelength conversion layer4is disposed on the transparent substrate2, and the wavelength conversion layer4may cover the LED structure14. Additionally, the wavelength conversion layer4may further cover the second main surface21B of the transparent substrate2.

In addition, a non-planar structure12M may be selectively disposed on the surfaces of the transparent substrate2for increasing the intensity of light emitted from the transparent substrate2and unifying the distribution of the emitted light. The non-planar structure12M may be a convex geometric structure or a concave geometric structure, such as a pyramid, a cone, a hemispheroid, a triangular prism and so forth. The non-planar structures12M may be arranged regularly or randomly. Furthermore, a diamond-like carbon (DLC) film25may be selectively disposed on the surfaces of the transparent substrate2so as to enhance the thermal conductive ability and the heat dissipating performance.

Please refer toFIG. 9.FIG. 9is a cross-sectional diagram illustrating a semiconductor light emitting element according to another preferred embodiment of the present invention. Compared with the embodiment shown inFIG. 8, in the semiconductor light emitting element1of this embodiment, the first electrode16, the second electrode18and a first chip bonding layer28A are disposed on the same surface of the LED structure14. That the first electrode16and the second electrode18are electrically connected to the first connecting conductor20and the second connecting conductor22by flip chip. The first connecting conductor20and the second connecting conductor22may respectively extend corresponding to the positions of the first electrode16and18. And the first electrode16and the second electrode18may be respectively connected to the first connecting conductor20and the second connecting conductor22electrically through a second chip bonding layer28B. The second chip bonding layer28B may be a conductive bump such as a gold bump or a solder bump, a conductive glue such as a silver glue, or an eutectic layer such as an Au—Sn alloy eutectic layer or an In—Bi—Sn alloy eutectic layer, but not limited to this. By employing the second chip bonding layer28B, the first chip bonding layer28A under the LED structure14may not be required or may be replaced by the wavelength conversion layer4.

Please refer toFIG. 10.FIG. 10is a schematic diagram illustrating a semiconductor light emitting element according to another preferred embodiment of the present invention. As shown inFIG. 10, a semiconductor light emitting element310in this invention includes the transparent substrate2, at least one LED structure3, a first connecting electrode311A, a second connecting electrode311B and at least one wavelength conversion layer4. The LED structure3is disposed on the support surface210of the transparent substrate2and forms a first main surface21A where light emitted from. In this embodiment, the LED structure3has a beam angle greater than 180 degrees, and at least a part of light beams emitted from the LED structure3penetrate into the transparent substrate2. At least a part of the penetrating light beams may be emitted from a second main surface21B which is opposite to the first main surface21A, and the other penetrating light beams may be emitted from other surfaces of the transparent substrate2, so as to form the semiconductor light emitting element310providing light in multi-directions. The first connecting electrode311A and the second connecting electrode311B are respectively disposed on different sides of the transparent substrate2or on the same side of the transparent substrate2(not shown inFIG. 10). The first connecting electrode311A and the second connecting electrode311B may be electrodes of the semiconductor light emitting element310respectively formed by extension parts of a first connecting conductor and a second connecting conductor on the transparent substrate2, and the first connecting electrode311A and the second connecting electrode311B are electrically connected to the LED structure3accordingly. The wavelength conversion layer4at least covers the LED structure3and exposes at least a part of the first connecting electrode311A and the second connecting electrode311B. The wavelength conversion layer4at least partially absorbs a light beam emitted from the LED structure3or/and the transparent substrate2, and coverts the light beam into alight beam having another wavelength range. The converted light and the light which are not absorbed by the wavelength conversion layer4are mixed to extend the total wavelength range of the light beams emitted from the semiconductor light emitting element310and improve the light emitting performance of the semiconductor light emitting element310. Because the semiconductor light emitting element310in this embodiment includes the first connecting electrode311A and the second connecting electrode311B respectively disposed on the transparent substrate2, traditional LED packaging process may be omitted and the semiconductor light emitting element310may be independently manufactured and then combined with an appropriate supporting base. Accordingly, the total manufacturing yield may be improved, the structure may be simplified and applications of the corresponding supporting base may also be increased.

Please refer toFIG. 11. An illumination device11is provided in this embodiment. The illumination device11includes a supporting base5and the semiconductor light emitting element described above. The transparent substrate2of the semiconductor light emitting element may stand on (or lie on) and be electrically coupled to the supporting base5. A first angle θ1exists between the transparent substrate2and the supporting base5. The first angle θ1may be fixed or be adjusted according to the light shape requirement of the illumination device. Preferably, the first angle θ1ranges from 30 degrees to 150 degrees.

Please refer toFIG. 12. The supporting base5of the illumination device11in the present invention may further include a circuit board6electrically coupled to a power supply. The circuit board6is electrically coupled to a first connecting conductor and a second connecting conductor (not shown inFIG. 12) so as to be electrically connected to the LED structure3. The power supply may then provide electricity to the LED ship3for emitting light via the circuit board6. In other preferred embodiment of the present invention, the LED structure3may also be electrically connected to the supporting base directly via the first connecting conductor and the second connecting conductor (not shown inFIG. 12) without the circuit board6, and the power supply may provide electricity to the LED ship3via the supporting base5.

Please refer toFIG. 13. The illumination device11of the present invention may further include a reflector or filter8disposed on the second main surface21B or the support surface210. The reflector or filter8may be used to reflect at least a part of light beams emitted from the LED structure3and passing through the transparent substrate2. At least apart of the reflected light beams may be changed to be emitted from the first main surface21A. The reflector8may include at least one metal layer or a Bragg reflector, but not limited thereto. The Bragg reflector may be composed of a plurality of insulating thin films with different refractive indexes disposed in a stack configuration, or the Bragg reflector may be composed of a plurality of insulating thin films with different refractive indexes and a plurality of metal oxide layers disposed in a stack configuration.

Please refer toFIG. 14. The illumination device11of the present invention may further include a diamond-like carbon (DLC) film9disposed on the support surface210or/and the second main surface21B of the transparent substrate2so as to enhance the thermal conductive ability and the heat dissipating performance.

Please refer toFIG. 15.FIG. 15is a schematic diagram illustrating an illumination device according to another preferred embodiment of the present invention. As shown inFIG. 15, an illumination device10in this embodiment includes a supporting base26and the semiconductor light emitting element described in the present invention. The semiconductor light emitting element includes a transparent substrate2and at least one LED structure14. The semiconductor light emitting element may be at least partially embedded into the supporting base26. An electrode30and an electrode32of the supporting base26are electrically connected to the connecting conductors of the semiconductor light emitting element. Driving voltage V+ and V− may be accordingly provided through the electrodes30and32respectively to the LED structure14for emitting the light beam L. The LED structure14includes a first electrode16and a second electrode18respectively and electrically connected to the first connecting conductor20and the second connecting conductor22by wire bonding, but not limited thereto. Additionally, the LED structure14has a beam angle greater than 180 degrees or has a plurality of light emitting surfaces, and then the illumination device10may emit light beams from the first main surface21A and the second main surface21B. Furthermore, because some of the light beams may be emitted directly from the LED structure14and/or the other four side surfaces of the transparent substrate2, the illumination device10may accordingly emit light from multi sides or six sides or in full directions.

The semiconductor light emitting element may further include a wavelength conversion layer4selectively disposed on the LED structure14, the first main surface21A or the second main surface21B. The wavelength conversion layer4may at least partially absorb a light beam emitted from the LED structure14and covert the light beam into another light beam having different wavelength range so as to emit light with specific color or light having a wider wavelength range from the illumination device10. For example, when blue light beams are emitted from the LED structure14, a part of the blue light beams may be converted into yellow light beams by the wavelength conversion layer4, and the blue light beams and the yellow light beams may be mixed for presenting white light beams emitted from the illumination device10. Additionally, the transparent substrate2may be directly or indirectly fixed on the supporting base26in a parallel state or a non-parallel state. For instance, the transparent substrate2may be vertically fixed on the supporting base26by mounting a side wall of the transparent substrate2with the supporting base26directly, or the transparent substrate2may be horizontally disposed on the supporting base26, but not limited thereto. The transparent substrate2preferably includes materials with high thermal conductivity, and heat generated from the LED structure14may be accordingly dissipated to the supporting base26through the transparent substrate2, such that the high power LED structures can be applied in the illumination device of the present invention accordingly. However, in a preferred embodiment of the present invention, at the same power consumption of the illumination device, more LED structures with relatively low power are dispersed on the transparent substrate2so as to fully utilize the thermal conductivity capability of the transparent substrate2. For example, a power of the LED structure in this embodiment may be equal to or lower than 0.2 watt, but not limited thereto.

Please refer toFIG. 16.FIG. 16is a schematic diagram illustrating an illumination device according to another preferred embodiment of the present invention. Compared with the illumination shown inFIG. 15, an illumination device10′ in this embodiment includes a plurality of LED structures14, and at least some of the LED structures14are electrically connected to each other in series. Each of the LED structures14includes the first electrode16and the second electrode18. The first electrode16of one LED structure14disposed on one end of the series is electrically connected to the first connecting conductor20, and the second electrode18of another LED structure14disposed on another end of the series is electrically connected to the second connecting conductor22, but not limited thereto. The LED structures14may be electrically connected in series or in parallel. The LED structures14may be LED structures emitting identical color, such as blue LED structures, or LED structures emitting different colors may also be applied and combined according to different demands. The illumination device10′ may emit light in much more different colors by further employing the wavelength conversion layer4according to the present invention.

Please refer toFIG. 17.FIG. 17is a schematic diagram illustrating an illumination device according to another preferred embodiment of the present invention. Compared with the illumination devices shown inFIG. 15andFIG. 16, an illumination device50in this embodiment further includes a support51configured to connect the semiconductor light emitting element and the supporting base26. The transparent substrate2of the semiconductor light emitting element is fixed on a side of the support51by a unit bonding layer52, and another side of the support51may be disposed on or inserted into the supporting base26. Additionally, the support51is flexible so as to form an angle between the transparent substrate2and the supporting base26, and the angle ranges from 30 degrees to 150 degrees. A material of the support51may include one selected from aluminum, composite metallic material, copper conductor, electric wire, ceramic substrate, printed circuit board, or other appropriate materials.

Please refer toFIGS. 18-20. When the transparent substrate2in the present invention is disposed on a supporting base5, the transparent substrate2may be inserted or bonded to the supporting base5.

As shown inFIG. 18. When the transparent substrate2is disposed on the supporting base5, the transparent substrate2is inserted in to a single socket61of the supporting base5, and the semiconductor light emitting element may be electrically coupled to the single socket61via connecting conductors. The LED structures (not shown inFIG. 18) on the transparent substrate2have to be electrically coupled to a power supply from or through the supporting base5, and at least part of the conductive pattern or the connecting conductors are extended to an edge of the transparent substrate2and integrated in to an connecting finger having a plurality of conductive contact sheets or an electrically connecting port such as the connecting electrodes311A and311B described above (not shown inFIG. 18). When the transparent substrate2is inserted into the socket61, the LED structure (not shown inFIG. 18) may then receive electricity from or through the supporting base5, and the transparent substrate2may be fixed by the socket61of the supporting base5accordingly.

Please refer toFIG. 19.FIG. 19is a schematic diagram illustrating the transparent substrate2inserted into a multi sockets of the supporting base5. In this embodiment, the transparent substrate2has a dual-pin structure. One of the pins may be configured as a positive electrode of the device, and another one of the pins may be configured as a negative electrode of the device. Both of the pins have at least one conductive contact sheet respectively so as to act as connecting ports. Accordingly, there are at least two sockets61having corresponding shape and size with the pins so as to smoothly insert the transparent substrate2into the supporting base5and provide electricity to the LED structure.

Please refer toFIG. 20. The transparent substrate2is bonded to the supporting base5by the device bonding layer. In the bonding process, metal materials such as gold, tin, indium, bismuth or silver may be used in combining or welding the transparent substrate2and the supporting base5. Additionally, conductive silica gel or epoxy material may also be used in fixing the transparent substrate2on the supporting base5. The conductive pattern and the connecting conductors of the semiconductor light emitting element may be electrically connected to the supporting base via the device bonding layer accordingly.

Please refer toFIG. 21andFIG. 22. The supporting base5of the illumination device11described in the present invention may be a substrate comprising one selected from metal such as aluminum, composite metallic material including aluminum, copper conductor, electric wire, ceramic substrate or printed circuit board. There is at least one support62on a surface or edge of the supporting base5. The support62may be separated from the supporting base5, or the support62and the supporting base5are monolithically integrated. The semiconductor light emitting element may be electrically coupled to the support62by bonding, and a device bonding layer63is used to fix the transparent substrate2on the supporting base5. The first angle θ1is maintained between the transparent substrate2and a surface of the supporting base5without supports. The semiconductor light emitting elements may also be disposed on the surface of the supporting base5without supports so as to enhance the light emitting performance of the illumination device11. Additionally, the semiconductor light emitting element may also be inserted and connected to the support62(not shown inFIG. 21andFIG. 22), wherein a connector may be used to connect the semiconductor light emitting element and the support (and/or the support and the supporting base) so as to fix the transparent substrate2on the supporting base5. Because the supporting base5and the support62are flexible, it is more convenient to apply the present invention to different applications. Moreover, the color variety of the illumination device11may be enhanced for different demands by combining using the semiconductor light emitting elements having different light color.

Please refer toFIG. 23. As shown inFIG. 23, an illumination device in this embodiment includes at least one semiconductor light emitting element1and a supporting base5. The supporting base5includes at least one support62and at least one circuit pattern P. An end of the transparent substrate of the semiconductor light emitting element1is electrically coupled to the support62so as to avoid or reduce the shielding influence caused by the support62for light emitting from the semiconductor light emitting element1. The supporting base5may be selected from metal such as aluminum, composite metallic material including aluminum, copper conductor, electric wire, ceramic substrate or printed circuit board. The support62may be formed by cutting and bending a part of the supporting base5to form an angle (as the first angle θ1shown inFIG. 21andFIG. 22). The circuit pattern P is disposed on supporting base5, and the circuit pattern P has at least one set of electrical port to be electrically connected to a power supply. Another part of the circuit pattern P extends on the support62so as to be electrically connected to the semiconductor light emitting element1, and the semiconductor light emitting element1may than be electrically connected to the power supply via the circuit pattern P of the supporting base5. In addition, the supporting base5may further include at least one hole H or at least one gap G, and fixing devices such as screws, nails or bolts may be used to combine the supporting base5with other device via the hole H or the gap G according to the application conditions of the illumination device. Meanwhile, the hole H or the gap G may also be used to increase the heat radiating area and enhance the heat dissipation capability of the illumination device.

Please refer toFIG. 24.FIG. 24is a schematic diagram illustrating a device frame of an illumination device according to another preferred embodiment of the present invention. As shown inFIG. 24, a device frame322in this embodiment includes a supporting base5and at least one support62. Compared with the embodiment shown inFIG. 23, the support62in this embodiment includes at least one stripe part342and an opening330. The electrode30and the electrode32are respectively disposed on two sides of the opening330. The stripe part342forms at least one wall of the opening330. One semiconductor light emitting element described in the present invention is disposed correspondingly to the opening330and electrically coupled to the support62. The connecting conductors of the semiconductor light emitting element is electrically connected to the electrode30and the electrode32so as to drive the semiconductor light emitting element by a power supply via the support62and the circuit pattern on the supporting base5. A size of the opening330may not be smaller than a main light emitting surface of the semiconductor light emitting element so as to prevent light beams emitted from the semiconductor light emitting element from being blocked by the support62. A connection part between the support62and the supporting base5may be adjustable so as to adjust the angle between the support62and the supporting base5as required.

Please refer toFIG. 24andFIG. 25.FIG. 25is a schematic diagram illustrating an illumination device according to another preferred embodiment of the present invention. Compared with the embodiment shown inFIG. 24, an illumination device302shown inFIG. 25further includes at least one support62having a plurality of openings330. The openings330are respectively disposed on two opposite sides of the support62, and the stripe part342forms at least one wall of each opening330. The semiconductor light emitting element310are disposed correspondingly to the openings330, and the conductive pattern or the connecting electrodes (not shown inFIG. 25) of each semiconductor light emitting element310are respectively disposed correspondingly and electrically connected to the electrode30and32. The illumination device302in this embodiment may further include a plurality of the supports62. The support62is disposed between the semiconductor light emitting element1and the supporting base5. A length of the support62may substantially range from 5.8 to 20 um. Angles between the supporting base5and the supports62with the semiconductor light emitting element disposed on may be modified respectively. In other words, an angle between the supporting base5and at least one of the supports62may be different from an angle between the supporting base5and another one of the supports62so as to perform required light emitting effects, but not limited thereto. Additionally, semiconductor light emitting elements emitting light having different wavelength ranges may be disposed on an identical support or on different supports so as to enrich the color effect of the illumination device.

For enhancing the luminance and improving the light emitting effect, in an illumination device of another preferred embodiment of the present invention, a plurality of the semiconductor light emitting elements comprising the transparent substrates are disposed on the supporting bases detailed above or on other supporting structures. A point-symmetric distribution or a line-symmetric distribution may be applied. The semiconductor light emitting elements comprising the transparent substrates may be point-symmetrically disposed on the supporting structure or line-symmetrically disposed on the supporting structure. Please refer toFIGS. 26-29. In the illumination devices of the embodiments shown inFIGS. 26-29, the semiconductor light emitting elements are disposed on the supporting structures having different shapes. The light beams emitted from the illumination devices11may be uniform because of the point-symmetric distribution or the line-symmetric distribution (the LED structures are not shown inFIGS. 26-29). The light emitting effects of the illumination devices11may be further improved by adjusting the first angle described above. As shown inFIG. 26, the semiconductor light emitting elements are point-symmetrically arranged and form an angle between each other in 90 degrees. Therefore, at least two of the semiconductor light emitting elements may face any one of the four sides of the illumination device11. As shown inFIG. 27, the angle between the semiconductor light emitting elements is smaller than 90 degrees. As shown inFIG. 29, the angle between the semiconductor light emitting elements is larger than 90 degrees. In another preferred embodiment of the present invention (not shown), the semiconductor light emitting elements may be asymmetrically disposed and at least apart of the semiconductor light emitting elements may be disposed in a crowd or separately disposed so as to perform required light shape according to different applications of the illumination device.

Please refer toFIG. 30.FIG. 30is a schematic diagram illustrating an illumination device according to another preferred embodiment of the present invention. As shown inFIG. 30, an illumination device301includes a semiconductor light emitting element310and a support321. The support321includes an opening330, and the semiconductor light emitting element310is disposed correspondingly to the opening330. In this embodiment, an external part of the support321may be work as a pin or be bent to form a connecting pad required in surface mounting so as to be fixed and electrically connected to other electrical circuit units. A light emitting surface of the semiconductor light emitting element310is disposed in the opening330, and the illumination device301may still emit light from multi sides or six sides accordingly whether the support321is transparent or not.

Please refer toFIG. 31. An illumination device is provided in this embodiment of the present invention. The illumination device includes a lamp housing7having a tube shape, at least one semiconductor light emitting element1and a supporting structure60. The semiconductor light emitting element1is disposed on the supporting structure60, and at least a part of the semiconductor light emitting element1is disposed in space formed by the lamp housing7. Please refer toFIG. 32. When more semiconductor light emitting elements1are disposed in the lamp housing7, the first main surfaces21A of the semiconductor light emitting elements1are arranged separately and not parallel to one another. Additionally, the semiconductor light emitting elements1are at least partially disposed in space formed by the lamp housing7, and the semiconductor light emitting elements1are not closely adjacent to an inner wall of the lamp housing7. Preferably, a distance D between the semiconductor light emitting element1and the lamp housing7may be equal to or larger than 500 micrometers. However, the lamp housing7may also be formed by filling glue, and the lamp housing7may at least partially cover and directly contact the semiconductor light emitting element1.

Please refer toFIG. 33. According to another embodiment of the present invention, an illumination device303includes at least one light emitting element1, a supporting base5, and at least one support62. The light emitting element1is disposed on the support62and the support62is coupled to the supporting base5. In contrast to the embodiment as disclosed inFIG. 21, the support62of this embodiment is inclined that at least a part of the support62may be nearer to a central axis D1of the supporting base5. More specifically to this embodiment, the illumination device303includes two supports62and two light emitting elements1disposed on the two supports62respectively. The two supports62are connected to the supporting base5for better heat conduction. The supports62are inclined inward relative to the central axis D1of the supporting base5, and a first angle θ1between the light emitting element1and the supporting base5as shown in the figure (that is, an angle between the support62and the supporting base5) may range from 45 degrees to 75 degrees, such that the size of the illumination device303can be reduced in contrast to the embodiment as disclosed inFIG. 21. The luminance of the light illumination device303near to the central axis D1of the supporting base5is increased as well.

Please refer toFIG. 34-37. In contrast to the above embodiments of the present invention, illumination devices304/305/306/307according to different embodiments of the present invention are more flexible for various applications, and illumination devices304/305/306/307may be crystal lamps. The illumination device304includes at least one light emitting element1, a supporting base5, and at least one support62, as shown inFIG. 34. The support62may further include a first connected portion621and a second connected portion623. One end of the second connected portion623is disposed on the supporting base5, and the other end of the second connected portion623corresponding to the supporting base5is connected to one end of the first connected portion621. The light emitting element1is disposed on the other end of the first connected portion621corresponding to the second connected portion623. The first connected portion621may further be rotatable relative to the second connected portion623. More specifically to this embodiment, the first connected portion621extends outward or inward relative to the central axis D1of the supporting base5, and a second angle θ2between the first connected portion621and the second connected portion623may range from 135 degrees to 175 degrees, such that the luminance near to the central axis D1may be increased or decreased for different applications. The second connected portion623is perpendicular to the supporting base5, but not limited to this. A third angle θ3between the second connected portion623and the supporting base5may range from 45 degrees to 85 degrees according to some other embodiments of the present invention. The second connected portion623may further be rotatable relative to the supporting base5. According to this embodiment, the luminance near to the central axis D1of the supporting base5of the illumination device304can be higher than the embodiment as disclosed inFIG. 21, and the size of the illumination device304can be reduced.

Please refer toFIG. 35. In contrast to the embodiment as shown inFIG. 34, an illumination device305may include at least one support62including a first connected portion621and a second connected portion623, wherein a light emitting element1is disposed on one end of the first connected portion621and the end of the first connected portion621is connected to one end of the second connected portion623, and the other end of the second connected portion623corresponding to the first connected portion621is coupled to a supporting base5. The other end of the first connected portion621corresponding to the second connected portion623may extend inward or outward relative to a central axis D1of the supporting base5, and a second angle θ2between the first connected portion621and the second connected portion623may range from 5 degrees to 45 degrees for increasing the luminance near to the central axis C1. The other components of the illumination device305may be same as the illumination device304and are not reiterated here.

Additionally, please refer toFIG. 36. A support62of an illumination device306may be flexibly formed as an arc-shaped structure. A radius of the arc-shaped support62ranges from 10 millimeters to 200 millimeters, and a center of the arc-shaped structure may be near to or away from a central axis D1of a supporting base5of the illumination device306. Additionally, according to another embodiment as shown inFIG. 37, an illumination device307includes a support62which may be formed as a parabolic structure. Two light emitting elements1are disposed on the opposite sides of a central axis D1of the parabolic support62. Not limited to this, the support62can be an ellipse-shaped structure.