TWI603509B - Light emitting component - Google Patents

Description

Light-emitting element

The present invention relates to a light-emitting element, and more particularly to a light-emitting element having at least one wavelength conversion layer whose surface is non-planar.

Please refer to FIG. 1. FIG. 1 is a schematic view of a light-emitting element 1 of the prior art. As shown in FIG. 1, the light-emitting element 1 includes a light-emitting diode 10 and a fluorescent colloid 12. The phosphor colloid 12 is formed on the light emitting diode 10 by dispensing or spraying to encapsulate the light emitting diode 10. In general, the phosphor colloid 12 is doped with phosphor powder to excite the light emitted by the light-emitting diode 10 to a desired color. As shown in Fig. 1, since the phosphor colloid 12 directly covers the light-emitting diode 10, the phosphor powder in the phosphor colloid 12 is liable to cause light decay due to heat generated when the light-emitting diode 10 operates. Further, the surface 120 of the phosphor colloid 12 is flat, and the light emitted from the LED 10 is likely to cause a total reflection effect when passing through the surface 120. Furthermore, when the light emitted from the light-emitting diode 10 passes through the surface 120, the area of the excited phosphor is limited, so that the overall amount of light is limited.

The present invention provides a light-emitting element having at least one wavelength conversion layer whose surface is non-planar to solve the above problems.

According to an embodiment, the light-emitting element of the present invention comprises a light-emitting unit, an encapsulant layer and a wavelength conversion layer. The light emitting unit has a positive light exiting surface. The encapsulant layer covers the light emitting unit. The wavelength conversion layer is disposed on the encapsulant layer. The wavelength conversion layer has a first surface and a second surface opposite to the first surface, wherein the first surface is between the front light emitting surface and the second surface, and at least one of the first surface and the second surface is non- flat.

Preferably, the first surface is in contact with the encapsulant layer and is non-planar.

Preferably, the second surface is non-planar.

Preferably, the light-emitting element further comprises a light-transmitting plate disposed on the wavelength conversion layer, wherein the second surface is in contact with the light-transmitting plate and is planar.

Preferably, the light-emitting element further comprises a light-transmitting plate disposed between the encapsulant layer and the wavelength conversion layer, wherein the first surface is in contact with the light-transmitting plate and is planar, and the second surface is non-planar.

Preferably, the wavelength converting layer is deformed by mechanical force.

Preferably, the light-emitting element further comprises a reflective layer disposed on a side light-emitting surface of the light-emitting unit surrounding the light-emitting surface.

In summary, the present invention provides the wavelength conversion layer on the encapsulant layer so that the wavelength conversion layer does not contact the light-emitting unit, and the light-fading phenomenon of the phosphor powder in the wavelength conversion layer due to heat can be effectively avoided. Since at least one of the first surface and the second surface of the wavelength conversion layer is non-planar, when the first surface of the wavelength conversion layer in contact with the encapsulant layer is non-planar, the contact area between the two increases. Effectively increasing the area of the phosphor powder when the light emitted by the light-emitting unit passes through the first surface, thereby increasing the overall light output. When the second surface of the wavelength conversion layer not in contact with the encapsulant layer is non-planar, the total reflection effect when the light emitted by the light-emitting unit passes through the second surface can be effectively reduced. In addition, the present invention can provide a light-transmitting plate on the wavelength conversion layer or between the encapsulant layer and the wavelength conversion layer to guide the light emitted by the light-emitting unit to increase the total amount of light emitted, and to solidify the light-emitting element. The overall illuminating element is more durable. Furthermore, the present invention can provide a reflective layer on the light-emitting surface of the light-emitting unit to reflect the light emitted from the light-emitting surface of the light-emitting unit, thereby increasing the overall light output.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

1, 2, 3, 4, 5, 6, 7‧ ‧ lighting elements

10‧‧‧Lighting diode

12‧‧‧Fluorescent colloid

20‧‧‧Lighting unit

22‧‧‧Package layer

24‧‧‧wavelength conversion layer

50, 60‧‧‧ Translucent panels

70‧‧‧reflective layer

120‧‧‧ surface

200‧‧‧ is shining out

202‧‧‧Stained side

240‧‧‧ first surface

242‧‧‧ second surface

244, 700‧‧‧ side surface

H1, H2‧‧‧ vertical height

Figure 1 is a schematic view of a prior art light-emitting element.

Fig. 2 is a schematic view of a light-emitting element according to a first embodiment of the present invention.

Fig. 3 is a schematic view of a light-emitting element according to a second embodiment of the present invention.

Fig. 4 is a schematic view showing a light-emitting element according to a third embodiment of the present invention.

Fig. 5 is a schematic view of a light-emitting element according to a fourth embodiment of the present invention.

Fig. 6 is a schematic view of a light-emitting element according to a fifth embodiment of the present invention.

Fig. 7 is a schematic view showing a light-emitting element according to a sixth embodiment of the present invention.

Please refer to FIG. 2, which is a schematic view of a light-emitting element 2 according to a first embodiment of the present invention. As shown in FIG. 2, the light-emitting element 2 includes a light-emitting unit 20, an encapsulant layer 22, and a wavelength conversion layer 24. The light emitting unit 20 has a positive light exiting surface 200. The encapsulant layer 22 covers the light emitting unit 20. The wavelength conversion layer 24 is disposed on the encapsulant layer 22. The wavelength conversion layer 24 has a first surface 240 and a second surface 242, wherein the first surface 240 is located between the front surface 200 and the second surface 242.

In this embodiment, the light emitting unit 20 can be a light emitting diode, but is not limited thereto. The material of the encapsulant layer 22 can be silicone, epoxy or other encapsulant. The wavelength conversion layer 24 can be made of a mixture of a transparent colloid and a phosphor. The wavelength conversion layer 24 converts the wavelength of the light emitted by the light emitting unit 20 into another wavelength, thereby changing the color of the light emitted by the light emitting unit 20.

As shown in FIG. 2, the first surface 240 of the wavelength conversion layer 24 is in contact with the encapsulant layer 22 and is non-planar. Additionally, the second surface 242 of the wavelength conversion layer 24 is also non-planar. In this embodiment, the first surface 240 and the second surface 242 of the wavelength conversion layer 24 may be wavy surfaces. However, in another embodiment, the first surface 240 and the second surface 242 of the wavelength conversion layer 24 may also be serrated surfaces, concave-convex surfaces or other regular/irregular surfaces, depending on the application.

In this embodiment, the wavelength conversion layer 24 of the present invention can be made by the technical content disclosed in the Patent Application No. 102132241, but is not limited thereto. In particular, the wavelength conversion layer 24 of the present invention can be deformed by mechanical force, in other words, the wavelength conversion layer 24 is Therefore, when the first surface 240 of the wavelength conversion layer 24 is in contact with the encapsulant layer 22, the contact surface can be made non-planar by pressing or other simple bonding, without requiring an overly complicated semiconductor process.

Referring to Fig. 2, please refer to Fig. 3, which is a schematic view of a light-emitting element 3 according to a second embodiment of the present invention. The main difference between the light-emitting element 3 and the above-described light-emitting element 2 is that the second surface 242 of the wavelength conversion layer 24 of the light-emitting element 3 is a flat surface. It should be noted that the components of the same reference numerals as those shown in FIG. 2 in FIG. 3 have substantially the same principle of operation, and are not described herein again.

Referring to Fig. 2, please refer to Fig. 4, which is a schematic view of a light-emitting element 4 according to a third embodiment of the present invention. The main difference between the light-emitting element 4 and the above-described light-emitting element 2 is that the first surface 240 of the wavelength conversion layer 24 of the light-emitting element 4 is a flat surface. It should be noted that the components of the same reference numerals as those shown in FIG. 2 have substantially the same operation principle, and are not described herein again.

As the light-emitting elements 2, 3, and 4 shown in FIGS. 2 to 4, the present invention can design at least one of the first surface 240 and the second surface 242 of the wavelength conversion layer 24 to be non-planar according to actual light-emitting requirements. . When the first surface 240 of the wavelength conversion layer 24 in contact with the encapsulant layer 22 is non-planar, the contact area between the two is also increased. For example, the non-planar contact area between the two can be both conventionally known. The distance between the contact areas of the plane is 1.1 times, so that the area of the phosphor powder excited by the light emitted from the light-emitting unit 20 can be effectively increased, thereby increasing the overall light output. When the second surface 242 of the wavelength conversion layer 24 that is not in contact with the encapsulant layer 22 is non-planar, the total reflection effect when the light emitted by the light-emitting unit 20 passes through the second surface 242 can be effectively reduced. In addition, in the present invention, the wavelength conversion layer 24 is disposed on the encapsulant layer 22 such that the wavelength conversion layer 24 is not in contact with the light emitting unit 20, and the photo-degradation phenomenon of the phosphor powder in the wavelength conversion layer 24 due to heat can be effectively prevented.

Referring to Fig. 2, please refer to Fig. 5, which is a schematic view of a light-emitting element 5 according to a fourth embodiment of the present invention. The main difference between the light-emitting element 5 and the above-described light-emitting element 2 is that the light-emitting element 5 further includes a light-transmitting plate 50. As shown in FIG. 5, the light transmissive plate 50 is disposed on the wavelength conversion layer 24, wherein the second surface 242 of the wavelength conversion layer 24 is in contact with the light transmissive plate 50 and is planar. In this embodiment, the light-transmitting plate 50 can guide the light emitted by the light-emitting unit 20 to increase the overall output. The light amount and the light-emitting element 5 are solidified to make the light-emitting element 5 as a whole more durable. In addition, the material of the light transmissive plate 50 may be glass, sapphire or other light transmissive material. In particular, the wavelength conversion layer 24 of the present invention can be deformed by mechanical force, so that it can be disposed on the transparent plate 50 first, and then disposed on the encapsulant layer 22 by pressing or the like to make the first surface 240. The formation of non-planar, can simplify the process time and cost. It should be noted that the components of the same reference numerals as those shown in FIG. 2 are substantially the same, and will not be described again.

Referring to Fig. 2, please refer to Fig. 6, which is a schematic view of a light-emitting element 6 according to a fifth embodiment of the present invention. The main difference between the light-emitting element 6 and the above-described light-emitting element 2 is that the light-emitting element 6 further includes a light-transmitting plate 60. As shown in FIG. 6, the light-transmitting plate 60 is disposed between the encapsulant layer 22 and the wavelength conversion layer 24, wherein the first surface 240 of the wavelength conversion layer 24 is in contact with the light-transmitting plate 60 and is planar, and the second surface 242 is Non-planar. In this embodiment, the light-transmitting plate 60 can guide the light emitted by the light-emitting unit 20 to increase the total amount of light emitted, and solidify the light-emitting element 6 to make the light-emitting element 6 as a whole more durable. In addition, the material of the light transmissive plate 60 may be glass, sapphire or other light transmissive material. It should be noted that the components of the same reference numerals as those shown in FIG. 2 have substantially the same operation principle, and are not described herein again.

Referring to Fig. 2, please refer to Fig. 7, which is a schematic view of a light-emitting element 7 according to a sixth embodiment of the present invention. The main difference between the light-emitting element 7 and the above-described light-emitting element 2 is that the light-emitting element 7 further comprises a reflective layer 70. As shown in FIG. 7, the reflective layer 70 is disposed on a side light emitting surface 202 of one of the light emitting units 20 surrounding the light emitting surface 200. In this embodiment, the reflective layer 70 can reflect the light emitted by the side light emitting surface 202 of the light emitting unit 20, thereby increasing the overall light output. Preferably, the vertical height H1 of the reflective layer 70 can be greater than or equal to the vertical height H2 of the side light emitting surface 202 of the light emitting unit 20 to effectively reflect the light emitted by the side light emitting surface 202 of the light emitting unit 20. Further, the side surface 700 of the reflective layer 70 may be aligned with the side surface 244 of the wavelength conversion layer 24. Furthermore, the material of the reflective layer 70 comprises a polymer material (for example, silicone or epoxy resin), a metal oxide material (for example, titanium dioxide, zirconium dioxide, aluminum oxide or zinc oxide, etc.), a metal material (for example, aluminum). , silver, etc.) or a combination of the above materials. The material of the reflective layer 70 is preferably a polymer material and a metal oxide material. The combination of materials can have lower cost and ease of preparation. It should be noted that the components of the same reference numerals as those shown in FIG. 2 have substantially the same operation principle, and are not described herein again.

In summary, the present invention provides the wavelength conversion layer on the encapsulant layer so that the wavelength conversion layer does not contact the light-emitting unit, and the light-fading phenomenon of the phosphor powder in the wavelength conversion layer due to heat can be effectively avoided. Since at least one of the first surface and the second surface of the wavelength conversion layer is non-planar, when the first surface of the wavelength conversion layer in contact with the encapsulant layer is non-planar, the contact area between the two increases. Effectively increasing the area of the phosphor powder when the light emitted by the light-emitting unit passes through the first surface, thereby increasing the overall light output. When the second surface of the wavelength conversion layer not in contact with the encapsulant layer is non-planar, the total reflection effect when the light emitted by the light-emitting unit passes through the second surface can be effectively reduced. In addition, the present invention can provide a light-transmitting plate on the wavelength conversion layer or between the encapsulant layer and the wavelength conversion layer to guide the light emitted by the light-emitting unit to increase the total amount of light emitted, and to solidify the light-emitting element. The overall illuminating element is more durable. Furthermore, the present invention can provide a reflective layer on the light-emitting surface of the light-emitting unit to reflect the light emitted from the light-emitting surface of the light-emitting unit, thereby increasing the overall light output.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

2‧‧‧Lighting elements

20‧‧‧Lighting unit

22‧‧‧Package layer

24‧‧‧wavelength conversion layer

200‧‧‧ is shining out

240‧‧‧ first surface

242‧‧‧ second surface

Claims (10)

A light-emitting element comprising: a transparent substrate comprising a wavelength conversion layer and an encapsulant layer, the encapsulant layer being formed on the wavelength conversion layer; and an illumination unit attached to the transparent substrate, wherein the illumination The unit has a light emitting surface facing the transparent substrate and two electrodes disposed on a surface opposite to the light emitting surface; and a reflective layer covering the light emitting unit and a portion of the transparent substrate, and exposing at least the two The electrode, the material of the reflective layer comprises a combination of a polymer material and a metal oxide material, wherein an interface between the wavelength conversion layer and the encapsulant layer is an irregular wave surface/concave surface. The illuminating element of claim 1, wherein the illuminating element has a side plane comprising a portion of the reflective layer and a portion of the transparent substrate. The light-emitting element of claim 1, wherein the height of the reflective layer is greater than or equal to the height of the light-emitting unit. A light-emitting element comprising: a wavelength conversion layer; a light-emitting unit disposed on the wavelength conversion layer, the light-emitting unit having a light-emitting surface facing the wavelength conversion layer; and a reflective layer disposed at least on a portion of the light-emitting unit Surrounding the light-emitting surface on the side light-emitting surface, and exposing at least two electrodes of the light-emitting unit, the material of the reflective layer comprises a combination of a polymer material and a metal oxide material; and an encapsulant layer disposed on the wavelength conversion layer And covering the light emitting surface with the light emitting unit, wherein a surface of the adhesive layer is an irregular wave surface/concave surface. The illuminating element of claim 4, wherein the illuminating element has a side plane comprising a portion of the reflective layer and a portion of the wavelength converting layer. The light-emitting element of claim 4, wherein the height of the reflective layer is greater than or equal to the height of the light-emitting unit. A light-emitting element comprising: a light-transmissive substrate comprising a wavelength conversion layer and a light-guiding element; and a light-emitting unit disposed on the light-transmissive substrate, wherein the light-emitting unit has a light-emitting surface facing the wavelength conversion layer; And an encapsulating layer disposed on the transparent substrate, covering at least a portion of the side emitting surface of the light emitting unit and exposing at least two electrodes of the light emitting unit, wherein an interface between the wavelength conversion layer and the encapsulant layer is Irregular wave/concave surface. The illuminating element of claim 7, wherein the illuminating element has a side plane comprising a portion of the encapsulant layer and a portion of the transparent substrate. The illuminating element of claim 7, wherein the encapsulant layer exposes a region between the two electrodes. The illuminating element of claim 7, wherein the height of the encapsulant layer is greater than or equal to the height of the illuminating unit.