Abstract:
An embodiment of the invention discloses an optoelectronics system. The optoelectronic system includes an optoelectronic element having a first width; an adhesive material enclosing the optoelectronic element and having a second width larger than the first width; a phosphor structure formed between the optoelectronic element and the adhesive material; and a transparent substrate formed on the adhesive material.

Description:
REFERENCE TO RELATED APPLICATION 
       [0001]    This application is a continuation application of Ser. No. 12/840,848, filed Jul. 21, 2010, which is a continuation-in-part application of Ser. No. 11/160,588, filed Jun. 29, 2005, which is a continuation-in-part application of Ser. No. 10/604,245, filed Jul. 4, 2003, and claims the right of priority based on Taiwan application Ser. No. 098124681, filed Jul. 21, 2009, and Taiwan application Ser. No. 098146171, filed Dec. 30, 2009, and the content of which is hereby incorporated by reference. 
     
    
     TECHNICAL FIELD 
       [0002]    The application relates to an optoelectronic system, and more particularly to an integrated optoelectronic system. 
       DESCRIPTION OF BACKGROUND ART 
       [0003]    An optoelectronic element such as an LED (Light Emitting Diode) package is usually made from a complicated bare-chip packaging process. An optoelectronic system can be further built by integrating the packaged optoelectronic element with other electronic element such as capacitor, inductor, and/or non-electronic element. 
         [0004]    Similar to the trend of small and slim commercial electronic product, the development of the optoelectronic element also enters into an era of miniature package. One promising packaging design for semiconductor and optoelectronic element is the Chip-Level Package (CLP). 
       SUMMARY OF THE DISCLOSURE 
       [0005]    An optoelectronic system in accordance with embodiments of present application is disclosed. The optoelectronic system includes an optoelectronic element having a first width; an adhesive material enclosing the optoelectronic element and having a second width larger than the first width; a phosphor structure formed between the optoelectronic element and the adhesive material; and a transparent substrate formed on the adhesive material. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]      FIG. 1  illustrates a conventional LED package. 
           [0007]      FIGS. 2A˜2D  illustrate steps of making an optoelectronic system in accordance with an embodiment of the present invention. 
           [0008]      FIG. 3  illustrates an optoelectronic system in accordance with an embodiment of the present invention. 
           [0009]      FIG. 4  illustrates a system unit and a carrier in accordance with an embodiment of the present invention. 
           [0010]      FIG. 5  illustrates a system unit and a sub-carrier in accordance with an embodiment of the present invention. 
           [0011]      FIG. 6  illustrates electrical connections of system units in an optoelectronic system in accordance with an embodiment of the present invention. 
           [0012]      FIG. 7  illustrates electrical connections of system units in an optoelectronic system in accordance with another embodiment of the present invention. 
           [0013]      FIG. 8  illustrates electrical connections of system units in an optoelectronic system in accordance with further embodiment of the present invention. 
           [0014]      FIGS. 9A˜9D  illustrate steps of making an optoelectronic system in accordance with another embodiment of the present invention. 
           [0015]      FIG. 10  illustrates electrical connections of system units in an optoelectronic system in accordance with an embodiment of the present invention. 
           [0016]      FIG. 11  illustrates sub-groups of an optoelectronic system in accordance with an embodiment of the present invention. 
           [0017]      FIG. 12  illustrates electrical connection infrastructures of sub-groups in accordance with an embodiment of the present invention. 
           [0018]      FIG. 13  illustrates electrical connection infrastructure of sub-groups in accordance with another embodiment of the present invention. 
           [0019]      FIG. 14  illustrates the dimensions of one system unit in accordance with an embodiment of the present invention. 
           [0020]      FIG. 15  illustrates a deployment of a wave conversion material in an optoelectronic system in accordance with an embodiment of the present invention. 
           [0021]      FIG. 16  illustrates a deployment of a wave conversion material in an optoelectronic system in accordance with another embodiment of the present invention. 
           [0022]      FIG. 17  illustrates a deployment of a wave conversion material in an optoelectronic system in accordance with further embodiment of the present invention. 
           [0023]      FIG. 18  illustrates a deployment of a wave conversion material in an optoelectronic system in accordance with one embodiment of the present invention. 
           [0024]      FIG. 19  illustrates a deployment of a wave conversion material in an optoelectronic system in accordance with another embodiment of the present invention. 
           [0025]      FIG. 20  illustrates deployments of wave conversion materials in an optoelectronic system in accordance with further embodiment of the present invention. 
           [0026]      FIG. 21  illustrates deployments of system units in an optoelectronic system in accordance with further embodiment of the present invention. 
           [0027]      FIG. 22  illustrates deployments of optoelectronic elements or system units in an optoelectronic system in accordance with one embodiment of the present invention. 
           [0028]      FIGS. 23A˜23E  illustrate steps of manufacturing a structure in accordance with an embodiment of the present invention. 
           [0029]      FIGS. 24A˜24G  illustrate steps of manufacturing a structure in accordance with another embodiment of the present invention. 
           [0030]      FIGS. 25A and 25B  illustrate structures in accordance with one embodiment of the present invention. 
           [0031]      FIG. 26  illustrates a structure in accordance with an embodiment of the present invention. 
           [0032]      FIG. 27  illustrates a structure in accordance with another embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0033]    The embodiments are described hereinafter in accompany with drawings. 
         [0034]    As shown in  FIGS. 2A˜2D , a method of making an optoelectronic system  100  in accordance with an embodiment of the present invention is disclosed and includes steps of deploying two or more system units  30  on a carrier  10 ; confining the spatial relation between the system units  30  by introducing a material  40 ; separating the system units  30  from the carrier  10 ; and establishing an electrical connection  60  between any two of the system units. However, the sequence of performing the steps is not limited to the aforementioned and can be freely adjusted according to the actual manufacturing environment or conditions. 
         [0035]    The optoelectronic system  100  in accordance with one embodiment of the present invention includes two or more system units  30  which are connected in a network of transmitting and/or converting luminous energy and electric energy. The system unit  30  is a part of the network and provides luminous energy, electric energy, or both. For example, the optoelectronic system  100  is capable of receiving signal and/or electric energy to output luminous energy, or receiving luminous energy to output electric energy and/or signal. The optoelectronic system  100  can be used in various fields such as illumination, display, image recognition, image reproduction, power supply, data storage, and machining. 
         [0036]    Specifically, the optoelectronic system  100  is an integration, combination, and/or stack of the system units  30  which have optoelectronic function(s) and can be LED, photodiode, photoresistor, laser, infrared emitter, solar cell, and any combination thereof. Moreover, the optoelectronic system  100  can optionally include other non-optoelectronic system unit  30 , such as resister, capacitor, inductor, diode, and integrated circuit. 
         [0037]    The carrier  10  is provided as a base for growing and/ore supporting the system unit  30 . The candidates for carrier material include but not limited to Ge, GaAs, InP, sapphire, SiC, Si, LiAlO 2 , ZnO, GaN, AlN, metal, glass, composite, diamond, CVD diamond, and DLC (Diamond-Like Carbon). 
         [0038]    In one embodiment of the present invention, the whole or part of the main structure of one or more system units  30  is formed on the carrier  10 . Specifically, the carrier  10  is functioned as a ground structure of the system unit  30 . For example, one or more system units  30  are formed on the carrier  10  by chemical deposition, physical deposition, electroplating, synthesis, and/or self-assembly. Moreover, other than the aforementioned methods, cutting, grinding, polishing, photo-lithography, etching, and/or thermal treatment can be optionally introduced to the steps of forming the system unit  30 . 
         [0039]    The system unit  30  in accordance with one embodiment of the present invention is an optoelectronic semiconductor structure which is made by epitaxially growing semiconductor layers on a growth substrate which is used as the carrier  10 . Provided two or more system units  30  are formed on a common substrate, the adjoining system units  30  can be electrically and/or physically separated by trench or insulating region. However, the electrical layout of the system units  30  can be also formed by internal connection, external connection, or both. Taiwan patents, No. 434917 and No. I249148 are pertinent to the same and issued to the assignee of present application, and the content of which is hereby incorporated by reference. 
         [0040]    Specifically, system unit  30  at least includes a first conductivity layer, a conversion unit, and a second conductivity layer. At least two parts of the first conductivity layer and the second conductivity layer are two individual single layer or two individual multiple layers (“multiple layers” means two or more than two layers) having different electrical properties, polarities, dopants or providing electrons and holes. If the first conductivity layer and the second conductivity layer are composed of semiconductor materials, whose electrical properties could be composed of any two of p-type, n-type, and i-type. The conversion unit disposed between the first conductivity layer and the second conductivity layer is a region where the luminous energy and the electrical energy can transfer or can be induced to transfer. The system unit in which the electrical energy is transferred to the light energy is such as a light-emitting diode, a liquid crystal display, or an organic light-emitting diode; the one that the light energy is transferred to the electrical energy is such as a solar cell, or an optoelectronic diode. 
         [0041]    The system unit  30  in accordance with another embodiment of the present invention is an LED (light-emitting diode). The light emission spectrum of the LED can be adjusted by changing the physical or chemical arrangement of one semiconductor layer or more semiconductor layers. The materials such as the series of aluminum gallium indium phosphide (AlGaInP), the series of aluminum gallium indium nitride (AlGaInN), the series of zinc oxide (ZnO) and so on are commonly used. The conversion unit such as single heterostructure (SH), double heterostructure (DH), double-side double heterostructure (DDH), or multi-quantum well (MQW) are usually formed. Besides, the wavelength of the emitting light could also be adjusted by changing the number of the pairs of the quantum well in the MQW structure. 
         [0042]    In one embodiment of the present invention, one or more system unites  30  are built up before being mounted on the carrier  10 . In other words, the carrier  10  and the system unit  30  are independent from each other before establishing connection. Specifically, the carrier  10  is used to support the system unit  30 . For example, one or more system units  30  are mounted on the carrier  10  by means of glue, metal, pressure, and/or heat. Taiwan patents, No. 311287, No. 456058, No. 474034 and No. 493286 are pertinent to the same and issued to the assignee of present application, and the content of which is hereby incorporated by reference. Moreover, during establishing the connection, the system unit  30  can automatically or manually be placed on the carrier  10 . 
         [0043]    As shown in  FIG. 3 , the finished or semi-finished optoelectronic system  100  can be optionally further connected to an external body. The external body can be connected to one or two sides of the optoelectronic system  100 . In several embodiments, the optoelectronic system  100  is connected to the external body  10   a  by one side of an electrical connection  60 ; the optoelectronic system  100  is connected to the external body  10   b  by another side opposite to the electrical connection  60 ; the optoelectronic system  100  is connected to the external body  10   a  by the side of the electrical connection  60  and to the external body  10   b  by the side opposite to the electrical connection  60 . The connection of the optoelectronic system  100  and the external body is not limited to above-mentioned, but any surface of the optoelectronic system  100  can be connected to a proper external body. The external body can be a specific unit, component, device, system, composition, and any combination thereof. For example, the external body is a substrate formed by material as those of the carrier  10 , a circuit integration, an optoelectronic system, an active element, a passive element, a circuit element integration, and/or a fixture. 
         [0044]    In one embodiment of the present invention, a layer or structure  20  is further formed between the system unit  30  and the carrier  10 , as shown in  FIG. 4 . The layer or structure  20  is expected to develop a short-term or long-term connection between a part or whole of the system unit  30  and the carrier  10 . Herein, “short-term” is used to indicate a time point by or on the time the optoelectronic system  100  is made, delivered or unloaded; “long-term” is used to indicate a time point after the time the optoelectronic system  100  is made, delivered, or unloaded. In other words, the system unit  30  and the carrier  10  are not necessary to separate from each other. Specifically, the layer or structure  20  includes, for example, glue, alloy, semiconductor, adhesive tape, metallic single-layer, metallic multi-layer, jig, or any combination thereof. In addition, the layer or structure  20  possess not only a function to form a connection but also an optional function for reflecting, anti-reflecting, current-blocking, diffusion-blocking, stress-release, heat-conduction, and/or heat-insulation. For example, the layer or structure  20  includes a reflecting surface, an upper inter-layer positioned between the system unit  30  and the reflecting surface, and a lower inter-layer positioned between the system unit  30  and the reflecting surface. Except the reflecting function, one or both of the upper inter-layer and the lower inter-layer may possess at least one of the above-mentioned functions such as the function of connection, diffusion-blocking. 
         [0045]    In another embodiment of the present invention, the system unit  30  and the material  40  can be further connected to a sub-carrier  50 , as shown in  FIG. 5 . The connection step may be executed before or after any step of  FIGS. 2A˜2D . Preferably, the connection step is executed after the material  40  is introduced into the workflow, for example, after the steps of  FIG. 2B ,  FIG. 2C , or  FIG. 2D . Provided the sub-carrier  50  is connected to the system unit  30  and the material  40  after the step of  FIG. 2B , one may obtain a much reliable semi-finished structure to be used in following manufacturing steps. The sub-carrier  50  and the system unit  30  can be connected with each other by using the method listed in the description directed to  FIG. 4 , such as compression, heating, or any combination thereof. Specifically, a connection layer  50   a  is formed between the sub-carrier  50  and the system unit  30  to combine both. 
         [0046]    In addition, the connection layer  50   a  may possess not only the function of connection but also an optional function for reflecting, anti-reflecting, current-blocking, diffusion-blocking, stress-release, heat-conduction, and/or heat-insulation. It is not necessary to add an additional element to achieve such function(s), but by adjusting the composition, geometric shape, and/or process method of the sub-carrier  50  can accomplish the same. For example, a reflecting, refracting, scattering, concentrating, collimating, and/or, shielding structure can be formed on at least one light-exiting surface of the sub-carrier  50 . The light-exiting surface is a surface contacting with the system unit  30 , the material  40 , and/or the environmental medium. Specifically, the reflecting, refracting, scattering, concentrating, collimating, and/or, shielding structure are/is, for example, at least one of a mirror, regular concave and convex, irregular concave and convex, high refraction index difference interface, photonic crystal, concave lens, convex lens, Fresnel lens, and opaque surface. 
         [0047]      FIG. 6  illustrates the electrical connections of at least two system units  30  in the optoelectronic system  100  in accordance with one embodiment of the present invention. The system unit  30  herein includes two electrodes oriented in the same direction. Specifically, such system unit  30  is, for example, a light-emitting diode, more specific, is a light-emitting diode formed on an insulator, such as sapphire. In  FIG. 6(   a ), two system units  30  are coupled together in an anode-cathode connection by wire  60   a . In  FIG. 6(   b ), two system units  30  are coupled together in an anode-anode connection by wire  60   a . In  FIG. 6(   c ), two system units  30  are coupled in a cathode-cathode connection by wire  60   a.    
         [0048]      FIG. 7  illustrates the electrical connections of at least two system units  30  in the optoelectronic system  100  in accordance with another embodiment of the present invention. The detail can be referred to the description of  FIG. 6 . However, in present embodiment, the electrical connection between the system units  30  are built by an internal connection  60   b  which can be formed by depositing metallic material on a separating zone  60   b ′ formed on predetermined areas of the system units  30 . 
         [0049]      FIG. 8  illustrates the electrical connections of at least two system units  30  in the optoelectronic system  100  in accordance with further embodiment of the present invention. In  FIGS. 8(   a ) and  8 ( b ), the electrodes of the system units  30  are configured or extended to about the same elevation. Two system units  30  shown in  FIG. 8(   a ) are coupled in an anode-cathode connection by wire  60   a  or internal connection  60   b . Two system units  30  shown in  FIG. 8(   b ) are coupled together in any one of three type connections as shown of the equivalent circuits by wire  60   a  or internal connection  60   b . In  FIG. 8(   c ), two system units  30  shown in  FIG. 8(   b ) are coupled to a circuit carrier  60   c  as a part of an electrical network. 
         [0050]    As shown in  FIGS. 9A˜9D , a method of manufacturing the optoelectronic system  100  in accordance with another embodiment of the present invention is described as follows. Two or more system units  30  are firstly deployed on a carrier  10  and arranged to form an electrical connection  60  on one side thereof; confining the spatial relation between the system units  30  by introducing a material  40 ; separating the system units  30  from the carrier  10 ; and forming another one electrical connection  60  on another side. However, the above-mentioned steps are not limited to be performed or chosen in such sequence, and can be arranged according to the actual manufacturing environments or conditions. In addition, the electrical connections  60  on the two sides of the two system units  30  are not limited the quantity or position shown in the drawings, the user may arrange or modify them according to the characteristic of the circuit. Moreover, under no obvious contradiction, the other embodiments can be referred by or used in present embodiment. 
         [0051]      FIG. 10  illustrates the electrical connections of at least two system units  30  in the optoelectronic system  100  in accordance with one embodiment of the present invention. In  FIG. 10(   a ), two system units  30 , which are oriented in the same direction, are coupled together in a parallel connection by electrical connection  60 . In  FIG. 10(   b ), two system units  30 , which are reversely-oriented, are coupled together in an anti-parallel connection by electrical connection  60 . However, the system units  30 , which are oriented in the same direction, can be also coupled together in an anti-parallel connection by an applicable layout of the electrical connection  60 . In  FIG. 12(   c ), two system units  30  are coupled to a circuit carrier  60   c  as a part of an electrical network. 
         [0052]    In one embodiment of the present invention, the system units  30 , which are confined in the material  40 , can be further divided into sub-groups with equal or unequal quantity, as shown in  FIG. 11 . However, the quantity and layout of the system units  30  are only illustrative, but not to limit the application of the present invention. Without obvious contradiction, the system elements disclosed in other embodiments can be introduced into the present embodiment. Furthermore, the electrical connection among the system units  30  of the sub-group can be referred to the other relevant embodiments of the present invention. The method of forming the sub-group can be chemical means, physical means, or the combination thereof. The chemical means can be etching. The physical means can be mechanical cutting, polishing, laser cutting, water jet, thermal splitting, and/or ultrasonic vibration. The width of the material  40  between the neighboring system units  30  is preferably greater than a working tolerance of the dividing method. For example, the width of the material  40  between two sub-groups is set to be greater than or about a blade thickness of a dicing saw used to cut the material  40 . In practice, the blade thickness of the dicing saw ranges from few micrometers to few millimeters, such as 20 μm˜2 mm. The detail of dicing saw can be referred to the web sites of dicing saw providers. 
         [0053]      FIG. 12  illustrates the electrical connection of the sub-group in accordance with one embodiment of the present invention. However, the structures of system units in the drawing are only illustrative, but not to limit embodiment of the present invention. Without obvious contradiction, the system elements disclosed in other embodiments can be introduced into the present embodiment. In  FIG. 12(   a ), the electrical connection  60   b  bridges the separating zone  60   b ′ and is settled on the electrode  301  of the system unit  30  and the material  40 . In  FIG. 12(   b ), one end of the electrical connection  60   b  is electrically connected to the electrode  301  of the system unit  30  while the other end is directly settled on the material  40 . In  FIG. 12(   c ), the electrical connection  60   b  is electrically connected to the system unit  30  without passing the electrode  301 , and is directly settled on the material  40 . In  FIG. 12(   d ), the electrical connection  60   b  is electrically connected to the system unit  30  without passing the electrode  301  and bridged on the separating zone  60   b ′ to settle on the material  40 . 
         [0054]    As shown in  FIG. 13 , the optoelectronic system  100  in accordance with an embodiment of the present invention includes sub-groups constructed in two or more dimensions. The quantity and the connecting mode of the system units in each sub-group can be identical or different. For example, the sub-groups  100   a  and  100   c  are stacked on the sub-group  100   b , wherein the sub-group  100   a  includes four system units  30 ; the sub-group  100   b  includes one system unit  30 ; the sub-group  100   c  includes two system units  30 . The sub-groups can be electrically connected with each other by solder, silver glue, or other suitable conductive material. However, the sub-groups are not necessary to electrically connect with each other, i.e. the sub-groups are simply aggregated together. The structure or quantity of the system unit  30  in the drawing is only illustrative, but not to limit to the embodiment of the present invention. Under no obvious contradiction, the system unit and the connecting mode of other embodiments can be introduced to present embodiment. 
         [0055]      FIG. 14(   a ) shows the width L 2  of the sub-group and the width L 1  of the system nit  30 . L 1 /L 2  is defined as X, and 0.05≦X≦1, preferably, 0.1≦X≦0.2, 0.2≦X≦0.3, 0.3≦X≦0.4, 0.4≦X≦0.5, 0.5≦X≦0.6, 0.6≦X≦0.7, 0.8≦X≦0.9, and/or 0.9≦X≦1. Specifically, L 1 /L 2 =260/600, or 580/1000.  FIG. 14(   b ) illustrates a cross-sectional view of a sub-group in accordance with an embodiment of the present invention, wherein the contour of which is a trapezoid. The dimensional relation of the trapezoid is listed as follows: L 2 &gt;L 1 , L 2 &gt;L 3 . One or more system units  30  are positioned in the sub-group as shown in the drawing, however, the position of the system unit relative to the edge of the material  40  is not fixed, i.e. at least one edge of the system unit  30  can be arranged to touch or reach beyond the edge of the material  40 . For example, the system unit  30  can be arranged to approach, touch, or protrude the upper boundary  40   a  and/or the lower boundary  40   b  of the material  40 . 
         [0056]    As shown in  FIG. 15 , in one embodiment, the light-emitting system, sub-group, or system unit (herein collectively called “light source”) is integrated with a wave conversion material. Specifically, the wave conversion material can be composed of a material  40   a , a material  40   b , or a combination of materials  40   a  and  40   b . The material  40   a  is, for example, phosphor powder, dye, semiconductor, or ceramic powder. The material  40   b  is phosphor bulk, sintered bulk, ceramic bulk, organic glue, or inorganic glue. The material  40   a  can be integrated with the material  40 , material  40   b , or both in or after the above-mentioned manufacturing process of the light source. For example, the phosphor powder is mixed with the material  40  and then put on or filled in the system unit  30 , or the wave conversion material is boded to, dropped, screen-printed, and/or deposited on the system unit  30 . In  FIG. 15(   a ), the material  40   a , material  40   b , or both of the materials  40   a  and  40   b  are arranged in a light-exiting direction of the light source, preferably, on the light source. In  FIG. 15(   b ), the material  40   a  is mixed with the material  40 . In  FIG. 15(   c ), the materials  40   a  and  40   b  are arranged as a combination of  FIGS. 15(   a ) and  15 ( b ). In  FIG. 15(   d ), the material  40   a , material  40   b , or the combination of the materials  40   a  and  40   b  are arranged in a light-exiting direction of the light source, but not contacting with the light source, preferably, contacting with the material  40 . 
         [0057]    As shown in  FIG. 16 , the light-emitting system, sub-group, or the system unit (herein collectively called “light source”) emits blue light, and is covered by the wave conversion material. The detail embodiment of the wave conversion material can be referred to the description of  FIG. 15 . In  FIG. 16(   a ), the wave conversion material emits green light or yellow light. In  FIG. 16(   b ), the wave conversion material emits red light or yellow light. In  FIG. 16(   c ), a region of the wave conversion material emits yellow light; the other region thereof emits red light, wherein the two regions do not overlap with each other. Preferably, the area of yellow light is greater than that of red light. In  FIG. 16(   d ), a region of the wave conversion material emits yellow light; the other region thereof emits red light, wherein the two regions overlap with each other. Preferably, the region of yellow light is closer to the light source than the region of red light. Specifically, in the above cases, the color lights are generated from the corresponding phosphor powder or phosphor bulk which is excited by blue light. 
         [0058]    As shown in  FIG. 17(   a ), a part or a number of the system units in the light-emitting system or the sub-group emit blue light, while the other part or a number of the system units emit red light. The material  40  is mixed with red or yellow phosphor, preferably, the quantity of the blue light system unit is less than that of the red light system unit. For example, the quantity ratio of blue light system unit to the red light system unit is N/1+N (N belongs to a positive integer). Or the power ratio of the blue light system unit to the red light system unit is N1/N2 (N1 and N2 N belong to positive integers). Preferably, the blue light system unit has a greater power than the red light system unit. For example, N1/N2=3.0/1.0, 2.5/1.0, 2.0/1.0, 1.5/1.0, or 1.1/1.0. As shown in  FIG. 17(   b ), the system unit  30  of the light-emitting system, and/or the sub-group emits blue light, and the material  40  is mixed with red and yellow phosphor. Preferably, the red and yellow phosphor powders are uniformly distributed in a predetermined space of the material  40 . However, the powders may be also distributed in a random, gradient, dispersed, or staggered configuration. 
         [0059]    As shown in  FIG. 18(   a ), a part of the system units in the light-emitting system or the sub-group emit blue light, while the other part emit red light. The materials  40  and  40   b  are mixed with yellow phosphors having identical or different emitting spectrums. As shown in  FIG. 18(   b ), the effective or active system unit of the light-emitting system or sub-group emit blue light; while the materials  40  and  40   b  are mixed with red and yellow phosphor at a proper ratio. In  FIG. 18(   c ), the effective or active system unit of the light-emitting system or sub-group emit blue light, while the material  40  is mixed with yellow phosphor powder, and the material  40  is mixed with yellow phosphor powder, the material  40   b  is mixed with the red phosphor powder. 
         [0060]    As shown in  FIG. 19(   a ), a part of the system units in the light-emitting system or the sub-group emit blue light, while a part of the system units emit red light; a part of the system units emit green light. As shown in  FIG. 19(   b ), a part of the system units in the light-emitting system or the sub-group emit blue light, while the other part emit red light. The material  40  is arranged on the two parts of the system units and mixed with green phosphor powder. As shown in  FIG. 19(   c ), a part of the system units in the light-emitting system or the sub-group emit blue light, while the other part emit red light. The material  40  is arranged on the blue light system units and mixed with green phosphor powder. As shown in  FIG. 19(   d ), a part of the system units in the light-emitting system or the sub-group emit blue light, while the other part emit red light. The material  40  is arranged on a part or local area of the blue light system units and mixed with green phosphor powder. 
         [0061]    As shown in  FIGS. 20(   a )˜ 20 ( c ), the effective or active system unit in the light-emitting system or sub-group emit blue light. In  FIG. 20(   a ), an area of the material  40   b  is mixed with green phosphor powder; another area of the material  40   b  is mixed with red phosphor powder. Preferably, the area of green phosphor powder is greater than that of red phosphor powder. In  FIG. 20(   b ), an area of the material  40   b  is mixed with green phosphor powder; another area of the material  40   b  is mixed with red phosphor powder. The two areas are overlapped with each other. Preferably, the area emitting shorter wavelength is closer to the system unit than the area emitting longer wave length. In  FIG. 20(   c ), the material  40   b  is mixed with red and yellow phosphor powder. In  FIG. 20(   d ), the effective or active system units in the light-emitting system or sub-group emit invisible radiation, such as UV light. The materials  40   b  respectively mixed with blue, green, and red phosphor powder are arranged on the system unit. The areas of the tree parts can be adjusted according to the efficiency, decay, and/or thickness of the phosphor powders. 
         [0062]    In above-mentioned or following embodiments, cool white light can be formed by mixture of the blue light and suitable yellow light; warm white light can be formed by the mixture of blue light and suitable yellow light and red light. The power ratio of blue light to red light is about 2:1˜5:1, for example, 2.5:1, 3:1, 3.5:1, 4:1, and 4.5:1. The power ratio of green light to yellow light is about 1:4. However, the scale and the arrangement of the materials  40  and  40   b  in the drawing are only for illustration, but not to limit the embodiment of the present invention. In addition, the material  40 , the material  40   b , or both can further cover the system unit which the phosphor powder is not disposed in the light path thereof. The material  40  and/or the material  40   b  may be integrated with phosphor bulk, sintered bulk, ceramic bulk, dye, or the combination thereof. 
         [0063]    Furthermore, the optoelectronic system or sub-group includes not only system unit  30  which emits light but also one or more ICs which can be used to control the a part or whole of the system unit  30  or as a rely circuit of a part or whole of the system unit  30 , as shown in  FIG. 21(   a ). In addition to the ICs, the optoelectronic system or sub-group can be further connected to a system unit  30 ′. In one embodiment, the system unit  30 ′ is a power supply system, such as chemical battery, solar cell, and fuel cell. In another embodiment, the system unit  30 ′ is a transformer, a frequency conversion system, and a regulator. Specifically, the system unit  30 ′ is a SWMP (Switched Mode Power Supply), and/or high frequency transformer. 
         [0064]      FIGS. 22(   a )˜ 22 ( f ) illustrate the configurations of optoelectronic system or sub-group. Wherein, the system unit  30  is not limited to one emits light but can be one does not emit light. 
         [0065]    As shown in  FIG. 23A , a method of making the optoelectronic system in accordance with one embodiment of the present invention is disclosed. Firstly, a carrier  10  (also called “temporary substrate” in present embodiment) is provided. A layer or structure  20  (also called “first connecting layer”), which has adhesive upper and lower surfaces, is formed on the temporary substrate  10  by spin coating, vapor deposition, or printing. Two or more unpackaged system units  30  (also called “optoelectronic element”) are placed on and connected to the first connecting layer  20  by a pick &amp; place system. A number of trenches  304  are formed between the optoelectronic elements  30 . The precision of placing the optoelectronic elements  30  is governed by the pick &amp; place system, for example, the tolerance is not greater than 15 μm. The optoelectronic element is a light-emitting diode in the embodiment. The structure of the light-emitting diode includes a substrate  303 , a semiconductor epitaxial layer  302  formed on the substrate  303 , and at least one electrode  301 . The semiconductor epitaxial layer  302  includes a first conductivity semiconductor layer, an active layer, and a second conductivity semiconductor layer. Furthermore, the substrate  303  can be optionally removed during the manufacturing process in order to reduce the size of system. In one preferable embodiment, at least one electrode  301  of the optoelectronic element  30  is connected to the first connecting layer  20 . The optoelectronic elements  30  may emit lights having the same or different wave length ranged from UV to infrared. 
         [0066]    The material of the temporary substrate  10  is can be silicone, glass, quartz, ceramic, alloy, or PCB. The material of the first connecting layer  20  can be thermal release tape, UV release tape, chemical release tape, heat resistant tape, and blue tape. The material of the substrate  303  can be sapphire, SiC, ZnO, GaN, or Si, glass, quartz, or ceramic. The first conductivity semiconductor layer, the active layer, and the second conductivity semiconductor layer may include at least one element selected from the group consisting of Ga, Al, In, As, P, N, and Si. 
         [0067]    As shown in  FIG. 23B , a material  40  (also called “adhesive glue”) is further provided to fill the trenches  304  between the optoelectronic elements  30 , and cover the optoelectronic element  30  and the surface of the first connecting layer not covered by the optoelectronic element. The adhesive glue  40  is formed by spin coating, printing, or molding. The adhesive glue  40  may be a elastic material, such as silicone rubber, silicone resin, elastic PU, porous PU, acrylic rubber, or chip cutting glue, such as blue tape or UV glue. In present embodiment, a polish process can be further introduced to smooth the surface of the optoelectronic element  30  and prevent the overflow or sink of the adhesive glue  40 . 
         [0068]    As shown in  FIG. 23C , a sub-carrier  50  (also called “permanent substrate”) is provided to bond with optoelectronic elements  30  where the adhesive glue  40  is applied. The bonding process can be a hot pressing process. In a preferable embodiment, the permanent substrate  50  is directly connected to the substrate  303  of the optoelectronic element  30 . The material of the permanent substrate  50  can be chosen from silicone, glass, quartz, alloy, or PCB. 
         [0069]    As shown in  FIG. 23D , the temporary substrate  10 , the first connecting layer  20 , and part of the adhesive glue  40  are removed by laser lift-off, heating, and/or dissolving the pattern film. The electrode  301  of the optoelectronic elements  30  and part of the semiconductor epitaxial layer  302  are exposed. 
         [0070]    As shown in  FIG. 23E , the optoelectronic elements  30  are coupled together in a series connection by forming electrical connections  60  (specifically, are wires in present embodiment) which are formed by lithography, and/or wire bonding. The material of wire  60  can be Au, Al, or alloy thereof. The structure of the electrical connection  60  can be a single layer or multi-layer. Finally, an optoelectronic system is formed. 
         [0071]      FIGS. 24A˜24G  illustrate a workflow in accordance with another embodiment of the present invention. As shown in  FIG. 24A , a temporary substrate  10  is provided. A first connecting layer  20 , which has adhesive upper and lower surfaces, is formed on the temporary substrate  10  by spin coating, vapor deposition, or printing. Two or more unpackaged optoelectronic element  30  are placed on and connected to the first connecting layer  20  by a pick &amp; place system. A number of trenches  304  are formed between the optoelectronic elements  30 . The precision of placing the optoelectronic elements  30  is governed by the pick &amp; place system, for example, the tolerance is not greater than 15 μm. Wherein, the optoelectronic element is such as a light-emitting diode including a substrate  303 , a semiconductor epitaxial layer  302  formed on the substrate  303 , and at least one electrode  301 . The semiconductor epitaxial layer  302  includes a first conductivity semiconductor layer, an active layer, and a second conductivity semiconductor layer. In one preferable embodiment, at least one electrode  301  of the optoelectronic element  30  is connected to the first connecting layer  20 . The optoelectronic elements  30  may emit lights having the same or different wave lengths ranged from UV to infrared. 
         [0072]    The material of the temporary substrate  10  can be silicone, glass, quartz, ceramic, alloy, or PCB. The material of the first connecting layer  20  can be thermal release tape, UV release tape, chemical release tape, heat resistant tape, and blue tape. The material of the substrate  303  can be sapphire, SiC, ZnO, GaN, or Si, glass, quartz, or ceramic. The first conductivity semiconductor layer, the active layer, and the second conductivity semiconductor layer may include at least one element selected from the group consisting of Ga, Al, In, As, P, N, and Si. 
         [0073]    In addition, as shown in  FIG. 24A , a phosphor material P can be formed on the optoelectronic element  30 . A uniform phosphor material is better for providing stable white light and reducing the divergence of the white lights from the optoelectronic elements  30 . The phosphor material P can be formed by spin coating, depositing, dropping, scraping, or molding. In another embodiment, each of the optoelectronic elements  30  is covered by different phosphor material. In further embodiment, the optoelectronic elements  30  are optionally covered by different phosphor materials to blend into various color light, i.e. not all of the optoelectronic elements are covered by the phosphor material. For example, three of the optoelectronic elements, which are blue light-emitting diodes, are grouped together. The first one is covered by red phosphor; the second one is covered by green phosphor; the third one is not covered by any phosphor. The mixture of blue light, red light, and green light brings out white light. 
         [0074]    As shown in  FIG. 24B , an adhesive glue  40  is further provided to fill the trenches  304  between the optoelectronic elements  30 , and cover the optoelectronic element  30  and the surface of the first connecting layer  20  not covered by the optoelectronic element  30 . The adhesive glue  40  is formed by spin coating, printing, or molding. The adhesive glue  40  may be an elastic material, such as silicone rubber, silicone resin, elastic PU, porous PU, acrylic rubber, or chip cutting glue, such as blue tape or UV glue. In present embodiment, a polish process can be further introduced to smooth the surface of the optoelectronic element  30  and prevent the overflow or sink of the adhesive glue  40 . 
         [0075]    As shown in  FIG. 24C , a permanent substrate  50  is provided to bond with optoelectronic elements  30  where the adhesive glue  40  is applied. The bonding process can be a hot pressing process. In a preferable embodiment, the permanent substrate  50  is directly connected to the substrate  303  of the optoelectronic element  30 . The material of the permanent substrate  50  can be chosen from silicone, glass, quartz, alloy, or PCB. 
         [0076]    As shown in  FIG. 24D , the temporary substrate  10 , the first connecting layer  20 , and part of the adhesive glue  40  are removed by laser lift-off, heating, and/or dissolving the pattern film. The electrode  301  of the optoelectronic elements  30  and part of the semiconductor epitaxial layer  302  are exposed. 
         [0077]    As shown in  FIG. 24E , a number of fan-out electrodes  305  are formed on electrodes  301  of the optoelectronic element  30  by electroplating or vapor deposition. The area of the fan-out electrode  305  is greater than that of the electrode  301 , and the positioning tolerance for following packaging process is therefore increased. The fan-out electrode  305 , which has bigger area, is beneficial to conduct heat to the package substrate such as metal or PCB. The material of the fan-out electrode  305  is such as Au, Al, or alloy or multi metallic structure. 
         [0078]    As shown in  FIGS. 24F˜24G , the optoelectronic elements  30  are divided into chips. To form an optoelectronic system, each chip can be boned to a sub-mount  600  by solder  601 . The sub-mount  600  is such as a lead frame or large scale mounting substrate for facilitating the circuit layout of the optoelectronic system and heat dissipation. 
         [0079]    Moreover, the embodiments of  FIGS. 23 and 24  can be referred to or combined with each other. For example, the optoelectronic element  30  of  FIG. 23  can be optionally covered by phosphor material, or the step of  FIG. 23D  can be followed by the step of  FIG. 24E  in order to introduce the steps of making the fan-out electrode and dividing into chips. Similarly, the step of  FIG. 24D  can be followed by the step of  FIG. 23E  in order to couple the optoelectronic elements by wires. 
         [0080]    Furthermore, in another embodiment of the present invention as shown in  FIG. 25A , a permanent substrate  50  is firstly provided to connect with a second connecting layer  70  and then bonded to the optoelectronic elements  30  covered by the adhesive glue  40  by hot press process. The material of the second connecting layer  70  is such as SiO x , SiN x , and silicone. In further embodiment of the present invention, which can be introduced after  FIG. 23B  or  FIG. 24B , as shown in  FIG. 25B , the second connecting layer  70 ′ further includes channels  701  which is beneficial to increase the heat dissipation and power wattage of the optoelectronic system. The channels  701  are made by metallic material, such as Cu, Al, Ni, or the alloy thereof. However, the channels  701  and the second connecting layer  70 ′ may be made by the same material, such as sapphire, metal, and SiN. 
         [0081]    In one embodiment of the present invention, which can be introduced after  FIG. 23B  or  FIG. 24B , as shown in  FIG. 26 , a permanent substrate  50 , which is connected with a first reflecting layer  80  by an inter-layer (not shown), is provided to connect with a second connecting layer  70  and then bond to the optoelectronic elements  30  with the adhesive glue  40  by hot pressing process. The material of the inter-layer is such as SiO x , SiN x , and silicone. The first reflecting layer  80  is made by metallic material, such as Ag, Al, or Pt, or a distributed Bragg reflector (DBR) which is composed of dielectric materials or semiconductors. In present embodiment, the use of the first reflecting layer  80  is beneficial to increase the light extraction of the optoelectronic system. 
         [0082]    In further embodiment of the present invention, which is introduced after  FIG. 23B  or  FIG. 24B , as shown in  FIG. 27 , a substrate  50 ′ having a micro-pyramid array is provided to prevent side-emitting loss and/or poor light extraction due to the closeness of the optoelectronic elements  30 . The substrate  50 ′ with micro-pyramid array can be made by etching the semiconductor. The shape of the micro-pyramid  501  is such as cone, triangular pyramid, and tetra pyramid. The base angle of the micro-pyramid  501  is between 20˜70 degree. In another embodiment, a second reflecting layer with a higher refraction index can be formed on the surface of the substrate  50 ′. The substrate  50 ′ can be made by silicone, glass, quartz, ceramic, alloy, or PCB. If the substrate  50 ′ is made by a good conductive material, such as Cu, Al, Ceramic, and Si, the reliability of the optoelectronic element can be further improved. The substrate  50 ′ is aligned with the optoelectronic elements  30  by hot pressing process. In present embodiment, the use of the substrate  50 ′ with the micro-pyramid array is beneficial to increase the light extraction by turning the side-emitting light toward the vertical direction. 
         [0083]    The foregoing description has been directed to the specific embodiments of this invention. It will be apparent; however, that other alternatives and modifications may be made to the embodiments without escaping the spirit and scope of the invention.