TW201322517A - Light emitting device - Google Patents

Abstract

A light emitting device includes a light pervious substrate, a first electrode layer, a second electrode layer, a light emitting layer and a light wavelength conversion film. The light pervious substrate has a first surface and a second surface opposite to the first surface. The first electrode layer is disposed on the first surface, and the first electrode layer is a light pervious electrode layer. The second electrode layer is opposite to the first electrode layer, and the light emitting layer is disposed between the first electrode layer and the second electrode layer. The light wavelength conversion film includes a light pervious layer and a plurality of phosphor particles disposed in the light pervious layer. The light pervious layer has a light incident surface and a light emitting surface opposite to the light incident surface. The light incident surface is connected with the second surface, and the light emitting surface is contacted with external air. The light emitting device has better optical performance.

Description

Light-emitting element

The present invention relates to a semiconductor electronic component, and more particularly to a light emitting component.

The organic light-emitting diode has the advantages of small volume, long service life and fast reaction time. In recent years, with the continuous improvement of the process technology of the organic light emitting diode (OLED), the organic light-emitting diode has gradually evolved. The ground is used in a variety of fields, such as flat light sources or flat panel displays.

In order to enhance the color rendering index (CRI) of the organic light-emitting diode and the performance of the index color R9, the conventional technique achieves the above object by adding a plurality of dopants.

However, if the type of the doping material reaches three or more, how to mix the doping materials makes the luminescence spectrum and the luminescence efficiency of the organic luminescent diode meet the demand, and the organic luminescence containing three or more doping materials is difficult. The color stability of the diode at different driving voltages is also poor.

The present invention provides a light-emitting element which has an advantage of easy production and stable optical performance.

The present invention provides a light-emitting element including a transparent substrate, a first electrode layer, a second electrode layer, a light-emitting layer, and a light wavelength adjustment film. The transparent substrate has opposite first and second surfaces, the first electrode layer is disposed on the first surface, and the first electrode layer is a transparent electrode layer. The second electrode layer is opposite to the first electrode layer, and the light emitting layer is disposed between the first electrode layer and the second electrode layer. The light wavelength adjustment film includes a transparent layer and a plurality of fluorescent particles. The transparent layer has opposite light incident surfaces and light exit surfaces, the light incident surface is connected to the second surface, the light emitting surface is in contact with the outside air, and the fluorescent particles are disposed in the transparent layer.

In an embodiment of the invention, the light incident surface is a viscous surface adhered to the second surface.

In an embodiment of the invention, the fluorescent particles include a plurality of yellow fluorescent particles, a plurality of red fluorescent particles, or a combination thereof.

In an embodiment of the invention, the optical wavelength adjustment film further includes a plurality of scattering particles disposed in the transparent layer.

In an embodiment of the invention, the light exiting surface is provided with a microstructure.

In an embodiment of the invention, the microstructure comprises a plurality of microparticles, a plurality of grooves or a microlens array.

In an embodiment of the invention, the material of the transparent layer comprises polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polydimethyl. Polydimethylsiloxane (PDMS), silicone resin or silicone.

In an embodiment of the invention, the second electrode layer is a metal electrode layer.

In an embodiment of the invention, the weight of the fluorescent particles is between 0.1% and 2% by weight of the light wavelength adjusting film.

The present invention further provides a light-emitting element comprising a transparent substrate, a first electrode layer, a second electrode layer, a light-emitting layer, and a light wavelength adjustment film. The transparent substrate has opposite first and second surfaces, the first electrode layer is disposed on the first surface, and the first electrode layer is a transparent electrode layer. The second electrode layer is opposite to the first electrode layer, and the light emitting layer is disposed between the first electrode layer and the second electrode layer. The light wavelength adjustment film includes a plurality of phosphor particles, and has opposite light incident surfaces and light exit surfaces, and the light incident surface is connected to the second surface. In addition, the light-emitting layer is adapted to provide light, and part of the light enters the light wavelength adjustment film through the light-incident surface, and exits the light-wavelength adjustment film from the light-emitting surface to directly enter the outside air.

Different from the prior art, the present invention adopts the method of adding a light wavelength adjusting film to adjust the light emitting spectrum of the light emitting element, so that the disadvantages caused by the use of a plurality of doping materials by the prior art can be effectively solved. Therefore, the light-emitting element of the present invention has an advantage of being easy to produce and having stable optical properties.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

1 is a schematic view of a light-emitting element according to an embodiment of the present invention. Referring to FIG. 1 , the light emitting device 100 of the present embodiment includes a transparent substrate 110 , a first electrode layer 120 , a second electrode layer 130 , a light emitting layer 140 , and a light wavelength adjustment film 150 . The transparent substrate 110 may be a glass substrate or a plastic substrate, but is not limited thereto. The transparent substrate 110 has opposing first and second surfaces 112, 114. The first electrode layer 120 is disposed on the first surface 112, and the first electrode layer 120 is a transparent electrode layer, such as an indium tin oxide (ITO) electrode layer or an indium zinc oxide (IZO) electrode. Layers, etc. The second electrode layer 130 is opposite to the first electrode layer 120, and the first electrode layer 120 and the second electrode layer 130 are respectively a positive electrode and a negative electrode or a negative electrode and a positive electrode, respectively. This second electrode layer 130 is, for example, a metal electrode layer to provide a function of reflecting light. In another embodiment, the metal electrode layer may be replaced by a structure in which a transparent electrode layer is applied with a reflective film layer.

The light emitting layer 140 is disposed between the first electrode layer 120 and the second electrode layer 130. The material of the light emitting layer 140 may include an organic semiconductor material or an inorganic semiconductor material. Further, the optical wavelength adjustment film 150 includes a transparent layer 152 and a plurality of fluorescent particles 154, and these fluorescent particles 154 are disposed in the transparent layer 152. The transparent layer 152 has opposite light incident surfaces 151 and a light exit surface 153. The light incident surface 151 is connected to the second surface 114 of the transparent substrate 110, and the light exit surface 153 is in contact with the outside air.

In this embodiment, the material of the transparent layer 152 may include polyethylene terephthalate, polyethylene naphthalate, polydimethyl siloxane, decyl phthalate or silicone. The light incident surface 151 of the transparent layer 152 may be a viscous surface for facilitating adhesion to the second surface 114 of the transparent substrate 110. In addition, the fluorescent particles 154 of the present embodiment are, for example, evenly distributed in the transparent layer 152. The fluorescent particles 154 include, for example, a plurality of yellow fluorescent particles, a plurality of red fluorescent particles, or a combination thereof, but the fluorescent particles 154 The color selection depends on the design requirements, and the present invention is not limited. For example, the phosphor particles 154 may comprise fluorescent particles of Yttrium aluminium garnet (YAG). Further, a fluorescent material having an emission wavelength of from 630 nm to 650 nm may be selected as the fluorescent particles 154. Further, in order to enhance the color rendering performance of the light-emitting element 100 and the index color R9, the weight of the fluorescent particles 154 is, for example, between 0.1% and 2%, preferably 0.1% to 1% by weight of the light wavelength adjusting film 150. %between. However, the weight of these fluorescent particles 154 in the optical wavelength adjustment film 150 depends on design requirements, and the present invention is not limited thereto.

In the present embodiment, the electrons and holes provided by the first electrode layer 120 and the second electrode layer 130 are combined in the light emitting layer 140 to generate photons (ie, the light rays 142). Among the light rays 142 generated by the light-emitting layer 140, part of the light rays 142 pass through the transparent substrate 110 and enter the light wavelength adjustment film 150 via the light-incident surface 151. The red or yellow fluorescent particles 154 in the light wavelength adjusting film 150 convert part of the blue light in the light 142 into red light or yellow light, and then the light 142 leaves the light wavelength adjusting film 150 from the light emitting surface 153 and directly enters the outside air. .

The table below will list the actual data to illustrate the achievable efficacy of the optical wavelength adjustment film 150. In the following table, the first type of light-emitting element does not include a light wavelength adjustment film, and the remaining light-emitting elements are a first type of light-emitting element plus a light wavelength adjustment film, wherein the light wavelength adjustment film of the second light-emitting element includes 1% by weight. The fluorescent particles of YAG and the scattering particles containing titanium oxide between 0.1% and 10% are preferably scattering particles containing 0.1% by weight of titanium dioxide; the light wavelength adjusting film of the third light-emitting element comprises 1% by weight The luminescent particle having an emission wavelength of 630 nm; the optical wavelength adjustment film of the fourth illuminating element comprises: fluorinated particles having an emission wavelength of 630 nm and a scattering particle containing 0.1% by weight of titanium oxide; The light wavelength adjusting film of the fifth light-emitting element includes fluorescent particles having a light-emitting wavelength of 650 nm which is 1% by weight; and the light wavelength-adjusting film of the sixth light-emitting element includes a light-emitting wavelength of 1% by weight of 650 nm. Fluorescent particles and 0.1% by weight of titanium dioxide-containing scattering particles. It should be noted that the various sets of data listed in the following table, as well as the selected types of fluorescent particles and scattering particles, are merely exemplary embodiments of the present invention, and are not intended to limit the present invention.

As is apparent from the above table, the fact that the spectrum of the light ray 142 from the light-emitting layer 140 is adjusted by the fluorescent particles 154 in the light wavelength adjustment film 150 can surely improve the color rendering performance of the light-emitting element 100 and the expression of the index color R9. Compared with the means adopted by the prior art, the present invention does not need to increase the type of the doping material, so that it is possible to avoid problems such as difficulty in manufacturing and poor color stability due to excessive dopant materials. In addition, the mechanism in which the fluorescent particles 154 absorb light and then illuminate can diffuse the light 142 to enhance the luminance uniformity of the light emitting element 100.

It should be noted that the spirit of the present invention is to adjust the spectrum of the light ray 142 from the light-emitting layer 140 by the light wavelength adjustment film 150, and is not limited to the performance of the color rendering property and the index color R9.

Fig. 2 is a schematic view of a light-emitting element according to another embodiment of the present invention. Referring to FIG. 2, the light-emitting element 100a of the present embodiment is similar to the above-described light-emitting element 100. The difference is that the light wavelength adjustment film 150a of the present embodiment further includes a plurality of scattering particles 156 disposed in the transparent layer 152. When the light ray 142 is transmitted to the scattering particles 156, the scattering particles 156 diverge the light ray 142, so that the light-emitting uniformity and the light-emitting efficiency of the light-emitting element 100a can be further improved. That is to say, the light wavelength adjustment film 150a functions in addition to the spectrum of the light ray 142 from the light-emitting layer 140, and also functions as a light extraction film.

Fig. 3 is a schematic view showing a light wavelength adjustment film of a light-emitting element according to another embodiment of the present invention. Referring to FIG. 3, in the optical wavelength adjustment film 150b of the present embodiment, the light-emitting surface 153 of the transparent layer 152 is provided with a microstructure 158 for diffusing the light 142. The light wavelength adjustment film 150b is different from the light wavelength adjustment films 150 and 150a of the light-emitting elements 100 and 100a in that a microstructure 158 is added to further enhance the light-emitting efficiency of the light-emitting element. In addition, the microstructure 158 of the present embodiment is, for example, a microlens array protruding from the light exit surface 153, but the present invention does not limit the specific aspect of the microstructure. In another embodiment shown in FIG. 4, the microstructures 158a can include a plurality of grooves. In addition, in still another embodiment shown in FIG. 5, the microstructure 158b may include a plurality of micro-particles, wherein the micro-particles may be formed by roughening the light-emitting surface 158b of the transparent layer 152.

In summary, the light-emitting element of the present invention adjusts the light-emitting spectrum of the light-emitting element by applying an optical wavelength-adjusting film, so that the disadvantages caused by the use of a plurality of dopant materials in the prior art can be effectively solved. Therefore, the light-emitting element of the present invention has an advantage of being easy to produce and having stable optical properties. In addition, the mechanism by which the fluorescent particles absorb light and then illuminate can diffuse light to enhance the uniformity of light emission of the light-emitting element of the present invention.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100, 100a. . . Light-emitting element

110. . . Transparent substrate

112. . . First surface

114. . . Second surface

120. . . First electrode layer

130. . . Second electrode layer

140. . . Luminous layer

142. . . Light

150, 150a, 150b. . . Light wavelength adjustment film

151. . . Glossy surface

152. . . Transparent layer

153. . . Glossy surface

154. . . Fluorescent particles

156. . . Scattering particle

158, 158a, 158b. . . microstructure

1 is a schematic view of a light-emitting element according to an embodiment of the present invention.

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

Fig. 3 is a schematic view showing a light wavelength adjustment film of a light-emitting element according to another embodiment of the present invention.

Fig. 4 is a schematic view showing a light wavelength adjustment film of a light-emitting element according to another embodiment of the present invention.

Fig. 5 is a schematic view showing a light wavelength adjustment film of a light-emitting element according to another embodiment of the present invention.

100. . . Light-emitting element

110. . . Transparent substrate

112. . . First surface

114. . . Second surface

120. . . First electrode layer

130. . . Second electrode layer

140. . . Luminous layer

142. . . Light

150. . . Light wavelength adjustment film

151. . . Glossy surface

152. . . Transparent layer

153. . . Glossy surface

154. . . Fluorescent particles

Claims (10)

A light-emitting element comprising: a transparent substrate having a first surface and a second surface; a first electrode layer disposed on the first surface, the first electrode layer being a transparent electrode layer; An electrode layer opposite to the first electrode layer; a light emitting layer disposed between the first electrode layer and the second electrode layer; and a light wavelength adjusting film comprising: a transparent layer having an opposite light incident The surface is connected to the light emitting surface, the light incident surface is connected to the second surface, and the light emitting surface is in contact with the outside air; and the plurality of fluorescent particles are disposed in the transparent layer. The light-emitting element of claim 1, wherein the light-incident surface is a viscous surface adhered to the second surface. The light-emitting element according to claim 1, wherein the fluorescent particles comprise a plurality of yellow fluorescent particles, a plurality of red fluorescent particles, or a combination thereof. The light-emitting element according to claim 1, wherein the light wavelength adjustment film further comprises a plurality of scattering particles disposed in the transparent layer. The light-emitting element of claim 4, wherein the scattering particles have a weight of between 0.1% and 10% by weight of the light wavelength adjusting film, and the weight of the fluorescent particles is between the light wavelengths Adjust the weight of the film between 0.1% and 1%. The light-emitting element of claim 1, wherein the light-emitting surface is provided with a microstructure. The light-emitting element according to claim 1, wherein the transparent layer is made of polyethylene terephthalate, polyethylene naphthalate, polydimethyl siloxane, oxime resin or Silicone. The light-emitting element of claim 1, wherein the second electrode layer is a metal electrode layer. The light-emitting element according to claim 1, wherein the weight of the fluorescent particles is between 0.1% and 2% by weight of the light-wavelength adjusting film. A light-emitting element comprising: a transparent substrate having a first surface and a second surface; a first electrode layer disposed on the first surface, the first electrode layer being a transparent electrode layer; An electrode layer opposite to the first electrode layer; a light emitting layer disposed between the first electrode layer and the second electrode layer; and a light wavelength adjusting film including a plurality of fluorescent particles and having an opposite one a light incident surface and a light exit surface, wherein the light incident surface is coupled to the second surface; wherein the light emitting layer is adapted to provide light, and a portion of the light enters the light wavelength adjusting film via the light incident surface, and is separated from the light emitting surface The light wavelength adjustment film directly enters the outside air.