UV LED package structure, UV light emitting unit, and method for manufacturing UV light emitting unit

A UV light-emitting unit includes a carrier, a UV LED chip, a side lens, and a water-resistant layer. The UV LED chip is disposed on the carrier, and the UV LED chip has a top surface and a surrounding side surface arranged adjacent to the top surface. The top surface has a center region and an external region arranged around the center region and connected to the surrounding side surface. The side lens is disposed on the carrier. The surrounding side surface of the UV LED chip is covered by the side lens. The water-resistant layer covers an outer surface of the side lens and the external region of the top surface of the UV LED chip. In addition, the present disclosure also discloses a UV LED package structure and a method for manufacturing a UV light-emitting unit.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present disclosure relates to a light emitting unit; in particular, to a UV LED package structure, a UV light emitting unit, and a method for manufacturing a UV light emitting unit.

2. Description of Related Art

A conventional UV LED package structure including a UV LED chip provides with low light efficiency and bad reliability. Therefore, a major topic in the UV LED package structure is how to improve the light efficiency and bad reliability for the conventional UV LED package structure.

SUMMARY OF THE INVENTION

The present disclosure provides a UV LED package structure, a UV light emitting unit, and a method for manufacturing a UV light emitting unit to solve the drawbacks associated with conventional UV LED package structure.

The UV LED package structure, the UV light emitting unit, and the method for manufacturing a UV light emitting unit in the present disclosure each adapts the side lens, so that the light efficiency of the UV light emitting unit can be effectively increased. Moreover, the water-resistant layer is formed on the outer surface of the side lens, thereby effectively preventing any steam from invading into the UV LED chip to increase the reliability of the UV light emitting unit.

In order to further appreciate the characteristics and technical contents of the present disclosure, references are hereunder made to the detailed descriptions and appended drawings in connection with the present disclosure. However, the appended drawings are merely shown for exemplary purposes, and should not be construed as restricting the scope of the present disclosure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

References are hereunder made to the detailed descriptions and appended drawings in connection with the present disclosure. However, the appended drawings are merely provided for exemplary purposes, and should not be construed as restricting the scope of the present disclosure.

First Embodiment

Reference is made toFIGS. 1 to 10, which illustrate a first embodiment of the present disclosure. The present embodiment discloses a UV light emitting unit100and a method for manufacturing the UV light emitting unit100. The following description discloses the method first in order to clearly describe the UV light emitting unit100, but the UV light emitting unit100is not limited to being produced by the method. As shown inFIGS. 1 to 4, the method of the present embodiment includes steps S110to S170. However, the steps S110to S170can be changed or replaced in a reasonable manner, and the sequence of the steps S110to S170can be adjusted according to practical needs. Moreover, the figures only show how to manufacture two UV light emitting units100in order to clearly illustrate the method.

As shown inFIG. 1, the step S110is implemented by mounting a plurality of UV LED chips2on a circuit board10, which has a substantially plate-like structure. The UV LED chip2has a top surface21and a surrounding side surface22arranged adjacent to the top surface21. In the present embodiment, the top surface21is a light emitting surface of the UV LED chip2, and the surrounding side surface22is connected to a peripheral edge213of the top surface21. Moreover, the top surface21has a central region211and an external region212, the latter one of which is arranged around the central region211and is connected to the surrounding side surface22. The shape and the size of the central region211can be changed according to practical needs, and the present disclosure is not limited thereto. For example, the central region211can be a square shape, and an area of the central region211can be larger than that of the external region212.

As shown inFIG. 1, the step S120is implemented by attaching a protective sheet S onto the central region211of the top surface21of each of the UV LED chips2. The central region211of the UV LED chip2is entirely covered by the protective sheet S. The protective sheet S can be a thermal degradation tape, a heat resistance tape, or a UV-off tape, but the present disclosure is not limited thereto.

As shown inFIG. 1, the step S130is implemented by attaching the circuit board10onto a releasing tape T. The releasing tape T in the present embodiment can be a thermal release tape, a heat-resistant tape, or a UV tape, and the material of the releasing tape T is preferably as the same as that of the protective sheet S (for example, the releasing tape T and the protective sheet S are UV tapes), but the present disclosure is not limited thereto.

As shown inFIG. 2, the step S140is implemented by sawing the circuit board10to form a plurality of carriers11each having a first surface111and an opposite second surface112, a plurality of electrode layers12respectively formed on the first surfaces111of the carriers11, a plurality of soldering layers13respectively formed on the second surfaces112of the carriers11, a plurality of conductive pillars14respectively embedded in the carriers11, and a plurality of reflective layers15arranged on the first surface111of the carrier11. Moreover, each of the carriers11and the corresponding components are provided with one of the UV LED chips2disposed on the corresponding electrode layer12, and the corresponding reflective layer15is arranged around the electrode layer12. The carrier11further has a peripheral side113connected to the first surface111and the second surface112. Two opposite ends of each of the conductive pillars14are respectively connected to the electrode layer12and the soldering layer13, thereby establishing an electrical connection between the electrode layer12and the soldering layer13. The UV LED chip2is electrically connected to the electrode layer12and the soldering layer13.

As shown inFIG. 2, the step S150is implemented by forming a side lens3on each of the carriers11to cover the surrounding side surface22of the corresponding UV LED chip2. The side lens3is made of fluoropolymer or PDMS, and the reflective layer15is embedded in the side lens3. A bottom edge315of an outer surface31of the side lens3is preferably connected to a peripheral edge1111of the carrier11. A top edge314of the outer surface31of the side lens3is preferably connected to a peripheral edge213of the top surface21of the UV LED chip2, but present disclosure is not limited thereto.

As shown inFIG. 3, the step S160is implemented by forming a water-resistant layer4on each of the side lenses3to cover the peripheral side113of the corresponding carrier11, the outer surface31of the corresponding side lens3, the external region212of the top surface21of the corresponding UV LED chip2, and the corresponding protective sheet S. Specifically, a UV light emitting unit100formed by the carrier11, the UV LED chip2, the protective sheet S, and the side lens3in the present embodiment is substantially embedded in the water-resistant layer4. In other words, the UV light emitting unit100is almost embedded in the water-resistant layer4excepting the bottom surface112of the carrier11, but the present disclosure is not limited thereto.

As shown inFIG. 4, the step S170is implemented by removing the protective sheets S and the releasing tape T, thereby forming a plurality of UV light emitting units100. Before the protective sheets S and the releasing tape T are removed, the protective sheets S and the releasing tape T can be heated, irradiated by UV light, or contacted with an organic solution (e.g., acetone, ethanone, or isopropanol) according to their material for reducing the adhesion of each of the protective sheets S and the releasing tape T with respect to the UV light emitting units100, so that the protective sheets S and the releasing tape T can be removed from the UV light emitting units100more easily.

The method in the present embodiment has been disclosed in the above description, and the following description discloses the structure of the UV light emitting unit100. As shown inFIGS. 4 to 6, the UV light emitting unit100includes a carrier11, a UV LED chip2, a side lens3, and a water-resistant layer4. The following description discloses the structure and connection relationships of each component of the UV light emitting unit100.

The UV light emitting unit100further includes an electrode layer12, a soldering layer13, a plurality of conductive pillars14, and a reflective layer15. The carrier11has a first surface111and a second surface112opposite to the first surface111. The electrode layer12is arranged on the first surface111. The soldering layer13is arranged on the second surface112. The conductive pillars13are embedded in the carrier11, and two opposite ends of each of the conductive pillars13are respectively connected to the electrode layer12and the soldering layer13, thereby establishing an electrical connection between the electrode layer12and the soldering layer13. The reflective layer15is arranged on the first surface111of the carrier11and around the electrode layer12. The reflective layer15and the electrode layer12are complementary in shape with each other to form a sheet-like structure, but the present disclosure is not limited thereto. Moreover, the reflective layer15is also around (two electrode pads of) the UV LED chip2.

Specifically, the reflective layer15in the present embodiment can be made of aluminum nitride, gold, or aluminum, but the present disclosure is not limited thereto. For example, when the reflective layer15is made of aluminum, the light reflectivity of the reflective layer15with respect to UV light of 280 nm is 92%, so that the reflective layer15can be used to increase the light efficiency of the UV LED chip2(i.e., +27%). It should be noted that the reflective layer15made of aluminum is preferably covered by magnesium fluoride or silicon dioxide so as to prevent oxidation. Moreover, when the reflective layer15is made of gold, the light reflectivity of the reflective layer15with respect to UV light of 280 nm is 38%, so that the reflective layer15can be used to increase the light efficiency of the UV LED chip2(i.e., +13.5%). When the reflective layer15is made of aluminum nitride, the light reflectivity of the reflective layer15with respect to UV light of 280 nm is 16%.

The UV LED chip2in the present embodiment includes a plurality of quantum wells (i.e., AlxGa1−xN films, and x>0.2) disposed on a sapphire substrate thereof. The UV LED chip2is configured to emit light of a wavelength less than 324 nm, and the UV LED chip2is configured to have a bat-wing shaped light pattern and have a light emitting angle of substantial 126.5 degrees, but the present disclosure is not limited thereto. It should be noted that the UV light emitting unit100of the present disclosure must use a UV LED chip, that is to say, any light emitting unit, which is not included a UV LED chip, is not the subject in the present disclosure.

Specifically, the UV LED chip2has a top surface21and a surrounding side surface22. In the present embodiment, the top surface21is a light emitting surface of the UV LED chip2, and the surrounding side surface22is connected to a peripheral edge213of the top surface21. Moreover, the top surface21has a central region211and an external region212, the latter one of which is arranged around the central region211and is connected to the surrounding side surface22. The shape and the size of the central region211can be changed according to practical needs, and the present disclosure is not limited thereto. For example, the central region211can be a square shape, and an area of the central region211can be larger than that of the external region212.

Moreover, the UV LED chip2is a flip chip and includes two electrode pads (not labeled) arranged on a bottom surface thereof, and the two electrode pads in the present embodiment are substantially arranged under the central region211of the top surface21. That is to say, the position of the two electrode pads is arranged distant from the top surface21, and a projecting region defined by orthogonally projecting the two electrode pads onto the top surface21is located in the central region211, but the present disclosure is not limited thereto.

The two electrode pads of the UV LED chip2are bonded on the electrode layer12, thereby establishing an electrical connection between the UV LED chip2and the electrode layer12. A projecting region defined by orthogonally projecting the UV LED chip2onto the carrier11is substantially located on a center portion of the reflective layer15, and the projecting region has an area less than half of an area of the reflective layer15.

The side lens3is made of fluoropolymer or PDMS, and a reflective index of the side lens3in the present embodiment is substantially 1.4. The side lens3is disposed on the carrier11, the surrounding side surface22of the UV LED2is entirely covered by the side lens3, and the reflective layer15is embedded in the side lens3. That is to say, a portion of the UV LED chip2exposed from the side lens3is only the top surface21of the UV LED chip2.

The side lens3has an outer surface31. A top edge314of the outer surface31is connected to the peripheral edge213of the top surface21(or the external region212), and a bottom edge315of the outer surface31is connected to a peripheral edge1111of the first surface111of the carrier11. Specifically, the side lens3is formed by respectively connecting the top edge314and the bottom edge315of the side lens3to the peripheral edge213of the top surface21and the peripheral edge1111of the first surface111of the carrier11, so that the shape of the outer surface31of the side lens3(e.g., a flat surface311, a concave surface312, or a convex surface313) can be adjusted to have a suitable surface tension according to designer's needs (e.g., light efficiency and light emitting angle). The following description discloses three different configurations of the UV light emitting units100.

As shown inFIGS. 4 to 6, the outer surface31of the side lens3includes a plurality of flat surfaces311. The top edges314of the flat surfaces311are connected to the peripheral edge213of the top surface21(or the external region212) of the UV LED chip2, and the bottom edges315of the flat surfaces311are connected to the peripheral edge1111of the carrier11(or the first surface111). Thus, compared to a UV light emitting unit100formed without disposing the side lens3, the light efficiency of the UV light emitting unit100as shown inFIGS. 4 to 6can be effectively increased (i.e., about +23%˜+27%), and the light emitting angle of the UV light emitting unit100can be substantially controlled in a range within 115˜120 degrees.

As shown inFIGS. 7 and 8, the outer surface31of the side lens3includes a plurality of concave surfaces312. The top edges314of the concave surfaces312are connected to the peripheral edge213of the top surface21(or the external region212) of the UV LED chip2, and bottom edges315of the concave surfaces312are connected to the peripheral edge1111of the carrier11(or the first surface111). Thus, compared to a UV light emitting unit100formed without the side lens3, the light efficiency of the UV light emitting unit100as shown inFIGS. 7 and 8can be effectively increased (i.e., about +17%˜+23%), and the light emitting angle of the UV light emitting unit100can be substantially controlled at 100.9 degrees.

As shown inFIGS. 9 and 10, the outer surface31of the side lens3includes a plurality of convex surfaces313. The top edges314of the convex surfaces313are connected to the peripheral edge213of the top surface21(or the external region212) of the UV LED chip2, and the bottom edges315of the convex surfaces313are connected to the peripheral edge1111of the carrier11(or the first surface111). Thus, compared to a UV light emitting unit100formed without disposing the side lens3, the light efficiency of the UV light emitting unit100as shown inFIGS. 9 and 10can be effectively increased (i.e., about +27%˜+33%), and the light emitting angle of the UV light emitting unit100can be substantially controlled at 123.6 degrees.

Accordingly, the light efficiency of the UV light emitting unit100can be effectively increased by forming the side lens3made of fluoropolymer or PDMS. Moreover, the shape of the outer surface31of the side lens3can be adjusted according to designer's needs (e.g., light efficiency and light emitting angle), thereby satisfying different requests.

As shown inFIGS. 4 to 6, the water-resistant layer4is translucent and is made of fluoropolymer or an inorganic silicon dioxide film. In the present embodiment, the water-resistant layer4is made of amorphous fluoropolymer and substantially has a reflective index of 1.35, and the amorphous fluoropolymer preferably has a plurality of peripheral functional groups of —CONH˜Si(OR)n, but the present disclosure is not limited thereto. The water-resistant layer4having —CONH˜Si(OR)n is provided with a steam permeability of 0.2 g/m2/1 day. The side lens3made of PDMS is provided with a steam permeability of 105 g/m2/1 day. That is to say, the steam permeability of the water-resistant layer4is less than that of the side lens3, and the steam permeability of the side lens3divided by that of the water-resistant layer4is more than 10 (for example, 10˜500 is preferable).

The water-resistant layer4covers the outer surface31of the side lens3and the external region212of the top surface21of the UV LED chip2. In the present embodiment, the water-resistant layer4further covers the peripheral side113of the carrier11(i.e., the side surfaces of the carrier11between the first surface111and the second surface112), and the second surface112of the carrier11is exposed from the water-resistant layer4, but the present disclosure is not limited thereto. In other words, the carrier11, the UV LED chip2, and the side lens3in the present embodiment are almost embedded in the water-resistant layer4, but the central region211of the top surface21of the UV LED chip2and the second surface112of the carrier11are exposed from the water-resistant layer4.

Accordingly, the UV light emitting unit100is provided with the water-resistant layer4, which is made of fluoropolymer or an inorganic silicon dioxide film, to effectively prevent any steam from invading into the UV LED chip2, so that the damage probability of the UV LED chip2can be reduced. Moreover, when the UV light emitting unit100is applied to a method for manufacturing a UV LED package structure1000in the present disclosure, any nitrogen or vacuum packaging apparatus does not need to be used because the UV light emitting unit100has the water-resistant layer4, so that the cost of packaging machine can be effectively reduced.

Second Embodiment

Reference is made toFIGS. 11 to 15, which illustrate a second embodiment of the present disclosure. The present embodiment discloses a UV LED package structure1000, which has the UV light emitting unit100disclosed in the first embodiment, and a method for manufacturing a UV LED package structure1000. The description of the UV light emitting unit100and the method therefor has been disclosed in the first embodiment, so the present embodiment does not describe it again.

The following description discloses the method first in order to clearly describe the UV LED package structure1000, but the UV LED package structure1000is not limited to being produced by the method. The method of the present embodiment includes steps S210to S260. However, the steps S210to S260can be changed or replaced in a reasonable manner, and the sequence of the steps S210to S260can be adjusted according to practical needs. Moreover, the figures only show how to manufacture two UV LED package structures1000in order to clearly illustrate the method.

As shown inFIG. 11, the step S210is implemented by providing a substrate assembly200and a housing assembly300disposed on the substrate assembly200. The substrate assembly200and the housing assembly300surroundingly co-define a plurality of accommodating spaces A.

As shown inFIG. 11, the step S220is implemented by respectively arranging a plurality of UV light emitting units100in the accommodating spaces A and mounting the UV light emitting units100on the substrate assembly200.

As shown inFIG. 11, the step S230is implemented by fixing a plurality of translucent members401on the housing assembly300through an adhesive layer700, so that the translucent members401respectively enclose the accommodating spaces A. The translucent member401is preferably a plate-like quartz glass or lens, but the present disclosure is not limited thereto. It should be noted that when the UV LED package structure1000is manufactured by implementing the method, any nitrogen or vacuum packaging machine does not need to be used because the enclosed accommodating space A can be filled with air (i.e., not vacuum packaging), so that the cost of packaging machine can be effectively reduced.

As shown inFIG. 12, the step S240is implemented by bonding the substrate assembly200on a releasing tape T. The releasing tape T in the present embodiment can be a thermal release tape, a heat-resistant tape, or a UV tape, but the present disclosure is not limited thereto.

As shown inFIG. 12, the step S250is implemented by sawing the substrate assembly200, the housing assembly300, and the adhesive layer700to respectively form a plurality of substrates201, a plurality of housings301respectively disposed on the substrates201, and a plurality of adhesives701respectively disposed on the housings301. In addition, another releasing tape T can be further disposed on the top sides of the translucent members401for assisting to form a water-resistant film500in the following steps.

As shown inFIGS. 12 and 13, the step S260is implemented by forming a water-resistant film500on peripheral side2013of the substrate201, peripheral side of the housing3011, peripheral side4011of the translucent member401to produce a UV LED package structure1000, and then removing the releasing tapes T.

The method in the present embodiment has been disclosed in the above description, and the following description discloses the structure of the UV LED package structure1000. As shown inFIGS. 13 to 15, the UV LED package structure1000includes the UV light emitting unit100as disclosed in the first embodiment, a substrate201, a housing301, a translucent member401, and a water-resistant film500.

The substrate201includes two metallic pads202, two externally connecting pads203, and two connecting pillars204. The two metallic pads202are arranged on a top surface2011of the substrate201, and the externally connecting pads203are arranged on a bottom surface2012of the substrate201. The two connecting pillars204are embedded in the substrate201. One ends of the two connecting pillars204are respectively connected to the two metallic pads202, and the other ends of the two connecting pillars204are respectively connected to the two externally connecting pads203, thereby establishing an electrical connection between the two metallic pads202and the two externally connecting pads203.

Specifically, the UV light emitting unit100is mounted on the substrate201. The soldering layer13of the UV light emitting unit100is fixed on the two metallic pads202of the substrate201. The housing301is connected to the substrate201and around the UV light emitting unit100, so that the UV light emitting unit100is arranged in an accommodating space A surroundingly defined by the housing301and the substrate201.

Moreover, the translucent member401is fixed on the housing301by an adhesive701to enclose the accommodating space A, and the enclosed accommodating space A can be filled with air (not in vacuum). That is to say, the translucent member401, the housing301, and the substrate201surroundingly define an enclosed space (i.e., the enclosed accommodating space A) to accommodate the UV light emitting unit100.

The water-resistant film500covers the peripheral side2013of the substrate201, the peripheral side3011of the housing301, and at least part of the peripheral side4011of the translucent member401, thereby preventing any steam from invading into the enclosed accommodating space A. Specifically, a portion of the outer surface of the UV LED package structure1000in the present embodiment exposed from the water-resistant film500only includes the top surface4012of the translucent member401and the bottom surface2012of the substrate201, but the present disclosure is not limited thereto. The water-resistant film500is made of fluoropolymer or an inorganic silicon dioxide film. In the present embodiment, the water-resistant film500is made of amorphous fluoropolymer having a plurality of peripheral functional groups of —CONH˜Si(OR)n, but the present disclosure is not limited thereto.

Third Embodiment

Reference is made toFIGS. 16 to 21, which illustrate a third embodiment of the present disclosure. The present embodiment discloses a UV LED package structure1000, which has the UV light emitting unit100disclosed in the first embodiment, and a method for manufacturing the UV LED package structure1000. The description of the UV light emitting unit100and the method therefor has been disclosed in the first embodiment, so the present embodiment does not describe it again.

The following description discloses the method first in order to clearly explain the UV LED package structure1000, but the UV LED package structure1000is not limited to being produced by the method. The method of the present embodiment includes steps S310to S370. However, the steps S310to S370can be changed or replaced in a reasonable manner, and the sequence of the steps S310to S370can be adjusted according to practical needs. Moreover, the figures only show how to manufacture two UV LED package structures1000in order to clearly illustrate the method.

As shown inFIG. 16, the step S310is implemented by providing a substrate assembly200and a housing assembly300disposed on the substrate assembly200. The substrate assembly200and the housing assembly300surroundingly co-define a plurality of accommodating spaces A.

As shown inFIG. 16, the step S320is implemented by respectively arranging a plurality of UV light emitting units100in the accommodating spaces A and mounting the UV light emitting units100on the substrate assembly200.

As shown inFIG. 16, the step S330is implemented by fixing a translucent assembly400(i.e., a plurality of translucent members401) on the housing assembly300by and adhesive layer700, so that the translucent members401respectively enclose the accommodating spaces A. The translucent member401is preferably a convex lens, but the present disclosure is not limited thereto. It should be noted that when the UV LED package structure1000is manufactured by implementing the method, any nitrogen or vacuum packaging machine does not need to be used because the enclosed accommodating space A can be filled with air (not in vacuum), so that the cost of packaging machine can be effectively reduced.

As shown inFIG. 17, the step S340is implemented by disposing the substrate assembly200on a releasing tape T and disposing a surrounding wall W on the releasing tape T. Specifically, the surrounding wall W is higher than the housing assembly300, and the surrounding wall W is adhered on a peripheral side3011of the housing assembly300. The releasing tape T in the present embodiment can be a thermal release tape, a heat resistant tape, or a UV tape, but the present disclosure is not limited thereto.

As shown inFIG. 17, the step S350is implemented by forming a glue layer600, which is made of PDMS, on the housing assembly300and around bottom portions of the translucent members401. Specifically, the glue layer600is formed in a space surroundingly defined by the housing assembly300, the translucent assembly400, and the surrounding wall W.

As shown inFIG. 18, the step S360is implemented by sawing the substrate assembly200, the housing assembly300, the adhesive layer700, and the glue layer600to respectively form a plurality of substrates201, a plurality of housings301respectively disposed on the substrates201, a plurality of adhesives701respectively disposed on the housings301, and a plurality of glue bodies601respectively arranged around the translucent members401.

As shown inFIG. 19, the step S370is implemented by forming a water-resistant film500on peripheral sides2013,3011,4011,6011of each substrate201, the corresponding housing301, the corresponding translucent member401, and the corresponding glue body601to produce a UV LED package structure1000, and then removing the releasing tape T and the surrounding wall W.

The method in the present embodiment has been disclosed in the above description, and the following description discloses the structure of the UV LED package structure1000. As shown inFIGS. 19 to 21, the UV LED package structure1000includes the UV light emitting unit100as disclosed in the first embodiment, a substrate201, a housing301, a translucent member401, a glue body601, and a water-resistant film500.

The substrate201includes two metallic pads202are arranged on a top surface2011thereof, two externally connecting pads203arranged on a bottom surface2012thereof, and two connecting pillars204embedded therein. One ends of the two connecting pillars204are respectively connected to the two metallic pads202, and the other ends of the two connecting pillars204are respectively connected to the two externally connecting pads203, thereby establishing an electrical connection between the two metallic pads202and the two externally connecting pads203.

Specifically, the UV light emitting unit100is mounted on the substrate201. The soldering layer13of the UV light emitting unit100is fixed on the two metallic pads202of the substrate201. The housing301is connected to the substrate201and around the UV light emitting unit100, so that the UV light emitting unit100is arranged in an accommodating space A surroundingly defined by the housing301and the substrate201.

Moreover, the translucent member401is fixed on the housing301by an adhesive701to enclose the accommodating space A, and the enclosed accommodating space A can be filled with air (not in vacuum). That is to say, the translucent member401, the housing301, and the substrate201surroundingly co-define an enclosed space (i.e., the enclosed accommodating space A) to accommodate the UV light emitting unit100. The glue body601is made of PDMS, and the glue body601is disposed on a ring-shaped external corner C defined by the housing301and the translucent member401, so that the glue body601is configured to enhance the connection between the housing301and the translucent member401.

The water-resistant film500covers the peripheral side2013of the substrate201, the peripheral side3011of the housing301, the peripheral side6011of the glue body601, and at least part of the peripheral side4011of the translucent member401, thereby preventing any steam from invading into the enclosed accommodating space A. Specifically, a portion of the outer surface of the UV LED package structure1000in the present embodiment exposed from the water-resistant film500only includes the translucent member401and the bottom surface2012of the substrate201, but the present disclosure is not limited thereto. The water-resistant film500is made of fluoropolymer or an inorganic silicon dioxide film. In the present embodiment, the water-resistant film500is made of amorphous fluoropolymer having a plurality of peripheral functional groups of —CONH˜Si(OR)n, but the present disclosure is not limited thereto.

[The Possible Effects of the Present Disclosure]

In summary, the UV LED package structure, the UV light emitting unit, and the method for manufacturing a UV light emitting unit in the present embodiments each adapts the side lens made of fluoropolymer or PDMS, so that the light efficiency of the UV light emitting unit can be effectively increased. Moreover, the steam permeability of the water-resistant layer is less than that of the side lens, the steam permeability of the side lens divided by that of the water-resistant layer is more than 10, and the water-resistant layer made of fluoropolymer or an inorganic silicon dioxide film is formed on the outer surface of the side lens, thereby effectively preventing any steam from invading into the UV LED chip. In addition, the UV LED chip in the present disclosure has a bat-wing shaped light pattern, and the UV LED chip is cooperated with the side lens to change the light pattern from the bat-wing shape to the Lambertian shape, thereby increasing the light efficiency.

Specifically, the shape of the outer surface of the side lens can be adjusted according to designer's needs (e.g., light efficiency and light emitting angle), thereby satisfying different requests. Moreover, when the UV light emitting unit is applied to a method for manufacturing a UV LED package structure (i.e., the steps S230and S330), any nitrogen or vacuum packaging machine does not need to be used due to the UV light emitting unit has the water-resistant layer, so that the cost of packaging machine can be effectively reduced.