TW201544760A - Light emitting device - Google Patents

Abstract

A light emitting device including a base, at least one light emitting element, a wavelength transferring cover and a heat conductive structure is provided. The light emitting element is disposed on the base and electrically connected to the base. The wavelength transferring cover is disposed on the base and covers the light emitting element. The heat conductive structure is disposed on the base and directly connects to the wavelength transferring cover.

Description

Illuminating device

The present invention relates to a light-emitting device, and more particularly to a light-emitting device having a preferred heat-dissipating effect.

With the evolution of photovoltaic technology, the light-emitting mechanism of light-emitting elements has also evolved from thermoluminescence to electroluminescence (EL). Light-emitting elements of electroluminescence mechanism In order to achieve different light-emitting colors, it is a common method to use a phosphor powder to convert the wavelength of light emitted by the light-emitting elements.

In the case of a light-emitting diode lamp, in order to achieve different light-emitting colors, the wavelength conversion cover is usually disposed above the light-emitting diode light source module. When the light emitted by the light-emitting diode light source module is irradiated to the wavelength conversion cover, white light conversion is started. However, the thermal energy generated by the LED light source module and the thermal energy generated during the white light conversion process are accumulated on the wavelength conversion cover, thereby causing the temperature of the wavelength conversion cover to rise. Since the wavelength conversion cover is composed of a phosphor powder and a polymer material or glass, and the phosphor powder generates a thermal quenching phenomenon (Thermal Quenching Of Luminescence), the conversion efficiency of the wavelength conversion cover is lowered. , In turn, a color shift phenomenon occurs.

The invention provides a light-emitting device, wherein the heat-conducting structure directly contacts the wavelength conversion cover to quickly remove the heat generated by the light-emitting element, thereby effectively reducing the thermal extinction phenomenon of the wavelength conversion cover.

The light emitting device of the present invention includes a susceptor, a wavelength converting structure, and at least one light emitting element. The heat conducting structure includes a plurality of accommodating spaces, and the wavelength converting materials are accommodated in the accommodating spaces. The light emitting element is disposed on the base, wherein the base is connected to the heat conducting structure, and the wavelength converting structure covers the light emitting element.

The light emitting device of the present invention includes a susceptor, a mesh heat conductive support, and a plurality of wavelength conversion blocks. The base includes at least one light emitting component mounted thereon, and the mesh heat conducting bracket is coupled to the base. The wavelength conversion blocks are embedded in a plurality of meshes of the mesh heat-conducting bracket, and the wavelength conversion blocks and the mesh heat-conducting bracket cover the light-emitting elements.

The light-emitting device of the present invention includes a susceptor, a wavelength conversion layer, and a light-transmitting heat conductor. The pedestal includes at least one illuminating element mounted thereon, and the light transmissive heat conductor is coupled to the pedestal. The light-transmitting heat conductor covers and carries the wavelength conversion layer, and the wavelength conversion layer and the light-transmitting heat conductor cover the light-emitting element.

The light emitting device of the present invention includes a light emitting base, a wavelength converting material, and a heat conductive carrier. The wavelength converting material covers the light emitting base, and is adapted to connect the heat conducting carrier through which the light beam penetrates to the light emitting base and the wavelength converting material.

Based on the above, since the heat conducting structure of the present invention is disposed on the pedestal and directly Contacting the wavelength conversion cover, the heat conduction structure can quickly remove the heat generated by the light-emitting element through the susceptor without concentrating the heat generated by the light-emitting element on the wavelength conversion cover, thereby effectively reducing the thermal extinction phenomenon of the wavelength conversion cover. . In short, the light-emitting device of the present invention can have a better heat dissipation effect and can effectively avoid the occurrence of thermal extinction.

The above described features and advantages of the invention will be apparent from the following description.

100a, 100a', 100b, 100b1, 100b2, 100b3, 100c, 100d, 100e‧‧‧ illuminating device

110‧‧‧Base

112‧‧‧ Heat sink

120‧‧‧Lighting elements

130a, 130a', 130b, 130b1, 130b2, 130b3‧‧‧ wavelength conversion cover

131a‧‧‧ curved top cover

132a‧‧‧ inner surface

132b‧‧‧First inner surface

133a‧‧‧Side wall

134a‧‧‧ outer surface

134b‧‧‧First outer surface

135a‧‧‧ apex

140a, 140b, 140c, 140d‧‧‧ heat conduction structure

142d‧‧‧second inner surface

144d‧‧‧second outer surface

150‧‧‧reflective material layer

D‧‧‧Maximum vertical distance

H1, H2‧‧‧ height

FIG. 1A is a partial cross-sectional perspective view of a light emitting device according to an embodiment of the invention.

FIG. 1B is a partial cross-sectional perspective view of a light emitting device according to another embodiment of the present invention.

2 is a partial cross-sectional perspective view of a light emitting device according to another embodiment of the present invention.

3A is a partial cross-sectional perspective view of a light emitting device according to another embodiment of the present invention.

3B is a partial cross-sectional perspective view of a light emitting device according to another embodiment of the present invention.

3C is a partial cross-sectional perspective view of a light emitting device according to another embodiment of the present invention.

4 is a partial cross-sectional view of a light emitting device according to another embodiment of the present invention; Stereoscopic view.

FIG. 5 is a partial cross-sectional perspective view of a light emitting device according to another embodiment of the present invention.

6 is a partial cross-sectional perspective view of a light emitting device according to another embodiment of the present invention.

FIG. 1A is a partial cross-sectional perspective view of a light emitting device according to an embodiment of the invention. Referring to FIG. 1A, in the embodiment, the light-emitting device 100a includes a susceptor 110, at least one light-emitting element 120 (only one is schematically shown in FIG. 1A), a wavelength conversion cover 130a, and a heat-conducting structure 140a. In detail, the light emitting element 120 is disposed on the susceptor 110 and electrically connected to the susceptor 110 . The wavelength conversion cover 130a is disposed on the susceptor 110 and covers the light emitting element 120. The heat conducting structure 140a is disposed on the susceptor 110 and directly contacts the wavelength conversion cover 130a.

Specifically, the light-emitting element 120 of the embodiment is, for example, a light-emitting diode for generating light. The wavelength conversion mask 130a has an inner surface 132a and an outer surface 134a opposite to each other, wherein the heat conducting structure 140a directly contacts the inner surface 132a of the wavelength conversion mask 130a. As shown in FIG. 1A, the heat conducting structure 140a of the present embodiment is, for example, a mesh heat conducting structure, wherein the mesh pattern of the mesh heat conducting structure is, for example, rectangular, but is not limited thereto. Preferably, the heat conducting structure 140a of the embodiment occupies 5% to 40% of the surface area of the inner surface 132a of the wavelength conversion cover 130a. If less than 5%, the heat conduction effect is not good, and if it is greater than 40%, the light shielding is caused. Affects light extraction efficiency. especially, The ratio of the maximum vertical distance D of the apex 135a on the wavelength conversion cover to the height H1 of the heat conducting structure 140a is between 0.9 and 2. The height H1 of the heat conducting structure is set according to actual requirements to obtain a better The thermal conductivity does not affect the light. Here, the material of the heat conducting structure 140a may be selected from materials having high thermal conductivity and high reflectivity, such as at least one of silver, gold, copper, platinum, tin, and aluminum; or, the self-thermal conductivity may be selected. The material is, for example, a carbon nanotube or graphene. In this way, the heat conducting structure 140a can quickly carry away the heat generated by the light emitting element 120 through the susceptor 110 without being concentrated or staying on the wavelength conversion cover 130a, and the structural design and material selection of the heat conductive structure 140a. The light-emitting effect of the light-emitting element 120 can also be increased, thereby improving the light-emitting efficiency of the overall light-emitting device 100a.

FIG. 1B is a partial cross-sectional perspective view of a light emitting device according to another embodiment of the present invention. Referring to FIG. 1B, the illuminating device 100a' in this embodiment is similar to the illuminating device 100a of FIG. 1A, except that the illuminating device 100a' of the embodiment further includes a heat sink 112, wherein the pedestal 110 is configured. On the heat sink 112. Through the arrangement of the heat sink 112 and the heat conducting structure 140a, the heat conducting structure 140a can quickly dissipate the heat generated by the light emitting element 120 to the outside through the heat sink 112 and can be guided to other external heat conducting members such as heat sink fins (not shown). ). Preferably, the material of the heat sink 112 is selected from at least one of aluminum, tin, copper, silver, gold and ceramics, which can effectively improve the heat dissipation efficiency of the light-emitting device 100a'. More specifically, since the heat sink 112 has a height, the light emitting element 120 disposed on the susceptor 110 can be raised to make the light exit angle larger (ie, the full circumference angle).

It should be noted that the embodiment does not limit the heat conduction structure 140a and the wavelength conversion. The relative arrangement relationship between the masks 130a is changed. In other embodiments, referring to FIG. 2, the wavelength conversion cover 130a' of the present embodiment is composed of, for example, an arc-shaped top cover 131a and a side wall 133a, wherein the side wall 133a is connected to the curved top cover 131a and the base. Between the seats 110, and the side wall 133a stands perpendicular to the base 110 and surrounds the light emitting element 120. The heat conducting structure 140b of the light emitting device 100b is, for example, a mesh heat conducting structure, for example, a mesh heat conducting structure having a rectangular mesh pattern disposed on the inner surface 132a of the wavelength conversion cover 130a' and located only on the side wall 133a. That is, the height H2 of the heat conducting structure 140b is smaller than the maximum vertical distance D of the apex 135a of the wavelength conversion cover 130a' to the susceptor 110. Here, the ratio of the maximum vertical distance D to the height H2 is preferably 2, that is, the height of the heat conducting structure 140b is only half of the maximum vertical distance D of the apex 135a of the wavelength conversion cover 130a' to the susceptor 110. This design provides the best balance between thermal conductivity and non-shading design.

Of course, the embodiment does not limit the aspect of the wavelength conversion cover 130a'. In addition to the bullet type having the curved top cover 131a and the side wall 133a as shown in FIG. 2, the wavelength conversion cover may also be, for example, the light-emitting device 100b1 of FIG. 3A. The outline of the wavelength conversion cover 130b1 is hemispherical; or, the outline of the wavelength conversion cover 130b2 in the light-emitting device 100b2 of FIG. 3B is spherical; or, the shape of the wavelength conversion cover 130b3 in the light-emitting device 100b3 of FIG. 3C The contour has a shape of a substantially spherical body and a narrow neck portion, which may be required according to actual conditions, and is not limited herein.

Alternatively, referring to FIG. 4, the heat conducting structure 140c of the light emitting device 100c is, for example, a mesh heat conducting structure, such as a mesh-like heat conducting structure of a triangular-like mesh pattern, which is disposed on the outer surface 134a of the wavelength conversion cover 130a. Triangle The mesh pattern is effective in reducing shading. Here, the thermally conductive structure 140a occupies 5% to 40% of the surface area of the outer surface 134a of the wavelength conversion mask 130a. Alternatively, in other embodiments not shown, the heat conducting structure may be simultaneously disposed on the inner and outer surfaces of the wavelength conversion cover.

Alternatively, referring to FIG. 5, the heat conducting structure 140d of the light emitting device 100d is, for example, a mesh heat conducting structure, and has a second inner surface 142d and a second outer surface 144d opposite to each other. The wavelength conversion cover 130b has a first inner surface 132b and a first outer surface 134b opposite to each other. In particular, the second inner surface 142d and the second outer surface 144d of the thermally conductive structure 140d and the first inner surface 132b of the wavelength conversion shroud 130b are substantially coplanar with the first outer surface 134b, respectively. That is, the heat conductive structure 140d and the wavelength conversion cover 130b are fitted to each other. In this way, the heat generated by the light-emitting element 120 can be quickly carried away by the heat-conducting structure 140d via the susceptor 110, except that it can be directly transmitted from the heat-conducting structure 140d to the outside, without being concentrated or staying on the wavelength conversion cover 130b.

Of course, this embodiment also does not limit the structural form of the heat conductive structures 140a, 140b, 140c, 140d, although the heat conductive structures 140a, 140b, 140c, 140d mentioned herein are embodied as a mesh heat conductive structure, that is, have a larger Heat dissipation surface area. However, in other embodiments not shown, the heat conducting structure may also be a sheet-like heat conducting structure, a tubular heat conducting structure, or a heat conduction composed of a polygonal sheet body (for example, a pentagonal sheet or a hexagonal sheet). The structure, which still belongs to the technical solution that can be adopted by the present invention, does not depart from the scope of the present invention.

In addition, in order to further improve the light-emitting effect of the light-emitting element 120, please Referring to FIG. 6, the light emitting device 100e of the present embodiment may further include a reflective material layer 150, wherein the reflective material layer 150 is disposed on the heat conductive structure 140a. Here, the material of the reflective material layer 150 is selected, for example, from at least one of silver, chromium, nickel, and aluminum; or, the reflective material layer 150 is a Bragg mirror.

In summary, since the heat conducting structure of the present invention is disposed on the pedestal and directly contacts the wavelength conversion cover, the heat conducting structure can quickly remove the heat generated by the illuminating element without concentrating the heat generated by the illuminating element. On the wavelength conversion cover, the thermal extinction of the wavelength conversion cover can be effectively reduced. In short, the light-emitting device of the present invention can have a better heat dissipation effect and can effectively avoid the occurrence of thermal extinction.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100a‧‧‧Lighting device

110‧‧‧Base

120‧‧‧Lighting elements

130a‧‧‧wavelength conversion cover

132a‧‧‧ inner surface

134a‧‧‧ outer surface

135a‧‧‧ apex

140a‧‧‧thermal structure

D‧‧‧Maximum vertical distance

H1‧‧‧ Height

Claims (10)

A light-emitting device comprising: a susceptor; a wavelength conversion structure comprising: a heat-conducting structure comprising a plurality of accommodating spaces; and a wavelength-converting material housed in the accommodating spaces; and at least one illuminating element, configured On the pedestal, the susceptor is connected to the heat conducting structure, and the wavelength conversion structure covers the illuminating element. The illuminating device of claim 1, wherein the wavelength converting material accounts for 60% to 95% of the surface area of the wavelength converting structure. The illuminating device of claim 1, further comprising: a reflective material layer disposed on the heat conducting structure. A illuminating device comprising: a pedestal including at least one illuminating element mounted thereon; a mesh heat conducting bracket connected to the pedestal; and a plurality of wavelength converting blocks embedded in the plurality of meshes of the mesh heat conducting bracket, The wavelength conversion block and the mesh heat conducting bracket cover the light emitting element. The illuminating device of claim 4, further comprising: a reflective material layer disposed on the mesh heat conducting bracket. A light emitting device comprising: a susceptor including at least one illuminating element mounted thereon; a wavelength conversion layer; a light-transmissive heat-conducting body is connected to the pedestal, wherein the light-transmissive heat-conducting body is covered and carries the wavelength conversion layer, and the wavelength conversion layer and the light-transmitting heat-conducting body cover the light-emitting element. The illuminating device of claim 6, further comprising: a reflective material layer disposed on the transparent heat conductor. An illuminating device comprises: an illuminating pedestal; a wavelength converting material covering the illuminating base; and a heat conducting carrier connecting the illuminating pedestal and the wavelength converting material, and the heat conducting carrier is adapted to allow a light beam to penetrate. The illuminating device of claim 8, wherein the illuminating base comprises: a pedestal; and at least one illuminating element disposed on the pedestal, wherein the pedestal is connected to the reflective thermal conductor, and the wavelength The conversion material and the thermally conductive carrier cover the light emitting element. The illuminating device of claim 8, further comprising: a reflective material layer disposed on the thermally conductive carrier.