CN107316886B - White light emitting element - Google Patents

Abstract

A white light-emitting element has a first light-emitting area and a second light-emitting area. The white light emitting element includes a first light emitting unit, a second light emitting unit and a connection layer. The first light-emitting unit includes a first electrode layer and a first light-emitting layer, wherein the first light-emitting layer is disposed on the first electrode layer and located in the first light-emitting region and the second light-emitting region. The second light-emitting unit includes a second light-emitting layer located in the first light-emitting area and the second light-emitting area and a second electrode layer disposed on the second light-emitting layer. The connection layer is located between the first light-emitting unit and the second light-emitting unit, so that the first light-emitting unit and the second light-emitting unit are connected in series, wherein at least one of the first light-emitting unit and the second light-emitting unit includes at least one patterned light-emitting layer , at least one patterned light-emitting layer is located in the first light-emitting area or the second light-emitting area.

Description

white light emitting element

technical field

The present invention relates to a light-emitting element, and particularly to a white light-emitting element.

Background technique

White light emitting diodes have been widely used in the field of display and lighting. There is a stacked white light element, which is to stack blue light emitting diode elements and red-green light emitting diode elements together to mix the emitted color light into white light. However, at the current level of material development, blue light-emitting materials have a significant difference in luminous efficiency and life compared with red and green light-emitting materials; in the overall optical design, it is also necessary to consider the efficiency of red-green light-emitting diodes. However, it cannot be directly optimized for blue light-emitting diodes, so the luminous efficiency of such stacked white light-emitting devices is still limited, and the blue light intensity will be significantly reduced after long-term operation. As a result, such stacked white light components will have problems of color change and poor reliability after long-term operation in lighting or display applications.

SUMMARY OF THE INVENTION

The present invention provides a white light emitting element, which can effectively optimize the specific color light emitted by the white light emitting element to improve the luminous efficiency of the color light.

The white light-emitting element of the present invention has a first light-emitting region and a second light-emitting region, and includes a first light-emitting unit, a second light-emitting unit and a connection layer. The first light-emitting unit includes a first electrode layer and a first light-emitting layer. The first light-emitting layer is disposed on the first electrode layer and located in the first light-emitting region and the second light-emitting region. The second light-emitting unit includes a second light-emitting layer and a second electrode layer. The second light emitting layer is located in the first light emitting area and the second light emitting area. The second electrode layer is disposed on the second light emitting layer. The connection layer is located between the first light-emitting unit and the second light-emitting unit, so that the first light-emitting unit and the second light-emitting unit are connected in series, wherein at least one of the first light-emitting unit and the second light-emitting unit includes at least one patterned light-emitting layer , at least one patterned light-emitting layer is located in the first light-emitting area or the second light-emitting area.

Based on the above, the white light-emitting element of the present invention includes a first light-emitting unit, a second light-emitting unit, and a connecting layer connecting the first light-emitting unit and the second light-emitting unit, wherein the first light-emitting unit includes a first light-emitting area and a second light-emitting area. The first light-emitting layer in the second light-emitting unit includes a second light-emitting layer located in the first light-emitting area and the second light-emitting area, and at least one of the first light-emitting unit and the second light-emitting unit includes a first light-emitting area. or at least one patterned light-emitting layer in the second light-emitting area, so that the luminous efficiency of the patterned light-emitting layer can be ignored when designing the first light-emitting layer and the second light-emitting layer, so that the first light-emitting layer can be effectively optimized. The color light emitted by the layer and the second light-emitting layer can improve the luminous efficiency of the color light. In this way, the white light emitting device can solve the problems of the existing stacked white light emitting device such as the change of light color and poor reliability after long-term operation.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following specific embodiments are given and described in detail with the accompanying drawings as follows.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a white light emitting element according to a first embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the wavelength and the intensity of light emitted by the white light emitting element of FIG. 1 and the conventional stacked white light emitting element.

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

FIG. 4 is a graph showing the relationship between the wavelength and the intensity of the light emitted by the white light emitting element of FIG. 3 and the conventional stacked white light emitting element.

5 is a schematic cross-sectional view of a white light emitting element according to a third embodiment of the present invention.

FIG. 6 is a graph showing the relationship between the wavelength and the intensity of light emitted by the white light emitting element of FIG. 5 and the conventional stacked white light emitting element.

【Symbol Description】

10, 30, 50: white light emitting element

100, 300, 500: substrate

110, 310, 510: Component layer

120, 320, 520: the first electrode layer

120a, 120b, 320a, 320b, 520a, 520b, 520c: electrode patterns

130, 230, 330, 430, 530, 630: hole injection layer

140, 150, 240, 250, 340, 350, 440, 540, 550, 552, 640: hole transport layer

160, 360, 560: the first light-emitting layer

162, 362, 562: the first patterned light-emitting layer

260, 460, 660: the second light-emitting layer

262, 364, 564: the second patterned light-emitting layer

170, 270, 370, 470, 570, 670: Electron transport layer

180, 280, 380, 480, 580, 680: Electron injection layer

290, 490, 690: the second electrode layer

A: The first light-emitting area

B: Second light-emitting area

C: Third light-emitting area

R: connection layer

IA, 3IA, 5IA: first color light

IB, 3IB, 5IB: second color light

5IC: the third color light

U1: The first light-emitting unit

U2: The second light-emitting unit

Detailed ways

FIG. 1 is a schematic cross-sectional view of a white light emitting element according to a first embodiment of the present invention. 1, the white light emitting element 10 includes a first light emitting unit U1, a second light emitting unit U2 and a connection layer R, wherein the first light emitting unit U1 includes a first electrode layer 120, a first light emitting layer 160 and a first patterned light emitting unit Layer 162 , the second light-emitting unit U2 includes a second electrode layer 290 , a second light-emitting layer 260 and a second patterned light-emitting layer 262 . In addition, in this embodiment, the white light emitting element 10 may further include a substrate 100 , an element layer 110 , a hole injection layer (HIL) 130 , a hole transport layer (HTL) 140 , and holes transport layer 150, electron transport layer (ETL) 170, electron injection layer (EIL) 180, hole injection layer 230, hole transport layer 240, hole transport layer 250, electron transport layer 270, The electron injection layer 280, wherein the first light emitting unit U1 includes the hole injection layer 130, the hole transport layer 140, the hole transport layer 150, the electron transport layer 170, the electron injection layer 180, and the second light emitting unit U2 includes the hole injection layer layer 230 , hole transport layer 240 , hole transport layer 250 , electron transport layer 270 , electron injection layer 280 . Hereinafter, each of the above-mentioned members will be described in detail.

The substrate 100 has a first light emitting region A and a second light emitting region B. In this embodiment, the first light-emitting area A and the second light-emitting area B are respectively used to display color light of different colors. In this embodiment, the first light-emitting region A and the second light-emitting region B may be arranged side by side, that is, the first light-emitting region A and the second light-emitting region B are arranged adjacently, but not limited to this . In addition, in this embodiment, the material of the substrate 100 is, for example, glass, quartz, organic polymer, metal, or the like.

The element layer 110 is disposed on the substrate 100 . In this embodiment, the element layer 110 may be any active element layer known to those skilled in the art. Specifically, in this embodiment, the element layer 110 may include a plurality of thin film transistors (TFTs), capacitors and other driving elements, but the invention is not limited thereto.

The first electrode layer 120 is disposed on the substrate 100 . In detail, in this embodiment, the first electrode layer 120 includes an electrode pattern 120a and an electrode pattern 120b separated from each other, wherein the electrode pattern 120a is located in the first light emitting area A, and the electrode pattern 120b is located in the second light emitting area B. That is, in this embodiment, the first electrode layer 120 is a patterned electrode layer, and the first electrode layer 120 is located in the first light emitting area A and the second light emitting area B.

In this embodiment, the first electrode layer 120 may be formed by any method of manufacturing an electrode layer known to those skilled in the art. For example, in one embodiment, the method for forming the first electrode layer 120 includes the following steps: using a chemical vapor deposition (CVD) process or a physical vapor deposition (PVD) process on the substrate 100 An electrode material layer is formed, and then a lithography etching process is used to pattern the electrode material layer. For another example, in one embodiment, the method of forming the first electrode layer 120 includes performing an inject printing process.

In addition, in this embodiment, the material of the first electrode layer 120 may include a reflective material, such as a conductive material such as metal, alloy, metal oxide, or a stacked layer of a metal and a transparent metal oxide conductive material. The metal oxide conductive material is, for example, indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, or other suitable oxides. That is, in this embodiment, the first electrode layer 120 is a reflective electrode layer, whereby the white light emitting element 10 is of a top emission type design.

The hole injection layer 130 and the hole transport layer 140 are sequentially disposed on the first electrode layer 120 . In detail, in this embodiment, the hole injection layer 130 and the hole transport layer 140 are both located in the first light emitting region A and the second light emitting region B. In addition, the method for forming the hole injection layer 130 and the hole transport layer 140 includes, for example, performing an evaporation process or an inkjet process. The material of the hole injection layer 130 includes, for example, phthalocyanine copper, star-shaped aromatic amines, polyaniline, polyethylene dioxythiophene, or other suitable materials. The material of the hole transport layer 140 includes, for example, triaromatic amines, cross-structured diamine biphenyls, diamine biphenyl derivatives, or other suitable materials. It is worth mentioning that, in this embodiment, the white light emitting element 10 includes a hole injection layer 130 and a hole transport layer 140, but the present invention is not limited thereto. In other embodiments, the white light emitting element 10 may only include the hole injection layer 130 or the hole transport layer 140 , or the white light emitting element 10 may not include the hole injection layer 130 and the hole transport layer 140 . That is, the configuration of the hole injection layer 130 and the hole transport layer 140 is optional.

The hole transport layer 150 is disposed between the first electrode layer 120 and the first patterned light-emitting layer 162 to satisfy the optical thickness of the light emitted by the first patterned light-emitting layer 162 . In detail, in the present embodiment, the hole transport layer 150 is located in the first light emitting region A. As shown in FIG. That is, the hole transport layer 150 is a patterned hole transport layer. The hole transport layer 150 is formed by, for example, an evaporation process combined with a fine metal mask (FMM) or an inkjet process. The material of the hole transport layer 150 includes, for example, triaromatic amines, cross-structured diamine biphenyls, diamine biphenyl derivatives or other suitable materials, and may be the same as or different from the hole transport layer 140 .

The first patterned light-emitting layer 162 is disposed between the first electrode layer 120 and the first light-emitting layer 160 . In detail, in this embodiment, the first patterned light-emitting layer 162 is located in the first light-emitting area A and not located in the second light-emitting area B. In this embodiment, the first patterned light-emitting layer 162 is formed by, for example, an evaporation process and a corresponding FMM or inkjet process. In addition, in this embodiment, the first patterned light-emitting layer 162 is a red light-emitting layer. That is, in this embodiment, the first patterned light-emitting layer 162 includes a red light-emitting material.

The first light-emitting layer 160 is disposed on the first electrode layer 120 . Specifically, in this embodiment, the first light-emitting layer 160 is located in the first light-emitting region A and the second light-emitting region B. In more detail, in the present embodiment, in the first light-emitting region A, the first light-emitting layer 160 covers the first patterned light-emitting layer 162 . From another point of view, in this embodiment, the first patterned light-emitting layer 162 is only located in the first light-emitting region A, and the first light-emitting layer 160 is a continuous structure layer continuously distributed in the first light-emitting region A and the first light-emitting region A. in the second light-emitting region B. It is worth mentioning that, in this embodiment, since the first light-emitting layer 160 is a continuous structure layer, the first light-emitting layer 160 does not need to be formed by using FMM. In detail, in this embodiment, the first light emitting layer 160 is formed by, for example, an evaporation process or an inkjet process and a common metal mask.

In addition, in this embodiment, the first light-emitting layer 160 is a blue light-emitting layer. That is, in the present embodiment, the first light-emitting layer 160 includes a blue light-emitting material. From another viewpoint, in this embodiment, the first light emitting layer 160 is a blue common layer (BCL). It is worth mentioning that, in this embodiment, the first light-emitting layer 160 needs to use a material with a faster electron mobility, so that the first light-emitting layer 160 covers the first light-emitting layer of the first patterned light-emitting layer 162 In the region A, electrons and holes are easily combined in the first patterned light-emitting layer 162 to emit light. That is, in this embodiment, the first light-emitting layer 160 located in the first light-emitting region A functions as an electron transport layer. On the other hand, in this embodiment, the light emitted by the first light emitting layer 160 located in the second light emitting region B can be optimized through the micro resonant cavity effect.

The electron transport layer 170 and the electron injection layer 180 are sequentially arranged on the first light emitting layer 160 . In detail, in this embodiment, the electron injection layer 170 and the electron transport layer 180 are both located in the first light emitting region A and the second light emitting region B. In addition, the method for forming the electron transport layer 170 and the electron injection layer 180 includes, for example, performing an evaporation process or an inkjet process. The material of the electron transport layer 170 includes, for example, oxazole derivatives and their dendrimers, metal chelates, azole compounds, diazanthracene derivatives, silicon-containing heterocyclic compounds or other suitable materials. The material of the electron injection layer 180 includes, for example, lithium oxide, lithium boron oxide, potassium silicon oxide, cesium carbonate, sodium acetate, lithium fluoride or other suitable materials. It is worth mentioning that, in this embodiment, the white light emitting element 10 includes the electron transport layer 170 and the electron injection layer 180 , but the present invention is not limited thereto. In other embodiments, the white light emitting element 10 may only include the electron transport layer 170 or the electron injection layer 180 , or the white light emitting element 10 may not include the electron transport layer 170 and the electron injection layer 180 . That is, the configuration of the electron transport layer 170 and the electron injection layer 180 is optional.

The connection layer R is located between the first light-emitting unit U1 and the second light-emitting unit U2, so as to connect the first light-emitting unit U1 and the second light-emitting unit U2 in series. In this embodiment, the connection layer R includes a conductive material, such as molybdenum oxide (Molybdenum trioxide, MoO3), tungsten oxide (Tungsten trioxide, WO3), lithium or cesium.

The hole injection layer 230 and the hole transport layer 240 are arranged on the connection layer R in this order. In detail, in this embodiment, the hole injection layer 230 and the hole transport layer 240 are both located in the first light emitting region A and the second light emitting region B. In addition, the method for forming the hole injection layer 230 and the hole transport layer 240 includes, for example, performing an evaporation process or an inkjet process. The material of the hole injection layer 230 includes, for example, phthalocyanine copper, star-shaped aromatic amines, polyaniline, polyethylene dioxythiophene, or other suitable materials. The material of the hole transport layer 240 includes, for example, triaromatic amines, cross-structured diamine biphenyls, diamine biphenyl derivatives, or other suitable materials. It is worth mentioning that, in this embodiment, the white light emitting element 10 includes a hole injection layer 230 and a hole transport layer 240, but the present invention is not limited thereto. In other embodiments, the white light emitting element 10 may only include the hole injection layer 230 or the hole transport layer 240 , or the white light emitting element 10 may not include the hole injection layer 230 and the hole transport layer 240 . That is, the configuration of the hole injection layer 230 and the hole transport layer 240 is optional.

The hole transport layer 250 is disposed between the connection layer R and the second patterned light-emitting layer 262 to satisfy the optical thickness of the light emitted by the second patterned light-emitting layer 262 . In detail, in the present embodiment, the hole transport layer 250 is located in the first light emitting region A. As shown in FIG. That is, the hole transport layer 250 is a patterned hole transport layer. The hole transport layer 250 is formed by, for example, an evaporation process combined with an FMM or an inkjet process. The material of the hole transport layer 250 includes, for example, triaromatic amines, cross-structured diamine biphenyls, diamine biphenyl derivatives or other suitable materials, and may be the same as or different from the hole transport layer 240 .

The second patterned light-emitting layer 262 is disposed between the connection layer R and the second light-emitting layer 260 . In detail, in this embodiment, the second patterned light emitting layer 262 is located in the first light emitting area A and not located in the second light emitting area B. In this embodiment, the second patterned light-emitting layer 262 is formed by, for example, an evaporation process and a corresponding FMM or inkjet process. In addition, in this embodiment, the second patterned light-emitting layer 262 is a green light-emitting layer. That is, in this embodiment, the second patterned light-emitting layer 262 includes a green light-emitting material.

The second light-emitting layer 260 is disposed on the connection layer R. As shown in FIG. Specifically, in this embodiment, the second light emitting layer 260 is located in the first light emitting region A and the second light emitting region B. In more detail, in this embodiment, in the first light-emitting region A, the second light-emitting layer 260 covers the second patterned light-emitting layer 262 . From another point of view, in this embodiment, the second patterned light-emitting layer 262 is only located in the first light-emitting area A, and the second light-emitting layer 260 is a continuous structure layer continuously distributed in the first light-emitting area A and the in the second light-emitting region B. It is worth mentioning that, in this embodiment, since the second light-emitting layer 260 is a continuous structure layer, the second light-emitting layer 260 does not need to be formed by using FMM. In detail, in this embodiment, the second light emitting layer 260 is formed by, for example, an evaporation process or an inkjet process and a common metal mask.

In addition, in this embodiment, the second light-emitting layer 260 is a blue light-emitting layer. That is, in this embodiment, the second light-emitting layer 260 includes a blue light-emitting material. From another viewpoint, in this embodiment, the second light emitting layer 260 is a blue light common layer. From another viewpoint, in this embodiment, the first light-emitting layer 160 and the second light-emitting layer 260 can emit the same color light. It is worth mentioning that, in this embodiment, the second light-emitting layer 260 needs to use a material with faster electron mobility, so that in the first light-emitting area A where the second light-emitting layer 260 covers the second patterned light-emitting layer 262 , electrons and holes are easily combined in the second patterned light-emitting layer 262 to emit light. That is, in this embodiment, the second light-emitting layer 260 located in the first light-emitting region A functions as an electron transport layer. On the other hand, in this embodiment, the light emitted by the second light-emitting layer 260 located in the second light-emitting region B can be optimized through the micro-resonant cavity effect.

The electron transport layer 270 and the electron injection layer 280 are sequentially arranged on the second light emitting layer 260 . In detail, in this embodiment, the electron injection layer 270 and the electron transport layer 280 are both located in the first light emitting region A and the second light emitting region B. In addition, the method for forming the electron transport layer 270 and the electron injection layer 280 includes, for example, performing an evaporation process or an inkjet process. The material of the electron transport layer 270 includes, for example, oxazole derivatives and their dendrimers, metal chelates, azole compounds, diazanthracene derivatives, silicon-containing heterocyclic compounds or other suitable materials. The material of the electron injection layer 280 includes, for example, lithium oxide, lithium boron oxide, potassium silicon oxide, cesium carbonate, sodium acetate, lithium fluoride or other suitable materials. It is worth mentioning that, in this embodiment, the white light emitting element 10 includes the electron transport layer 270 and the electron injection layer 280 , but the present invention is not limited thereto. In other embodiments, the white light emitting element 10 may only include the electron transport layer 270 or the electron injection layer 280 , or the white light emitting element 10 may not include the electron transport layer 270 and the electron injection layer 280 . That is, the configuration of the electron transport layer 270 and the electron injection layer 280 is optional.

The second electrode layer 290 is disposed on the second light emitting layer 260 . Specifically, in this embodiment, the second electrode layer 290 is located in the first light emitting region A and the second light emitting region B. In this embodiment, the material of the second electrode layer 290 includes, for example, a transparent metal oxide conductive material, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, and indium germanium zinc oxide. or other suitable oxides; metals; or stacks of at least two of the above. That is, in this embodiment, the second electrode layer 290 may be a transparent electrode layer or a semi-transmissive and semi-reflective electrode layer.

In addition, in this embodiment, the first electrode layer 120 serves as an anode, and the second electrode layer 290 serves as a cathode. However, it must be noted that, for design requirements, the first electrode layer 120 may also be used as a cathode, and the second electrode layer 290 may be used as an anode. Further, the white light-emitting element 10 drives the first light-emitting layer 160 , the first patterned light-emitting layer 162 , the second light-emitting layer 260 and the second light-emitting layer 160 by generating a voltage difference between the first electrode layer 120 and the second electrode layer 290 The patterned light-emitting layer 262 emits light.

It is worth mentioning that, in the white light emitting element 10, between the first electrode layer 120 and the second electrode layer 290 in the first light emitting area A, and the first electrode layer 120 and the second electrode in the second light emitting area B A micro cavity can be formed between the layers 290 respectively, so that the light emitted from the first light emitting layer 160, the first patterned light emitting layer 162, the second light emitting layer 260 and the second patterned light emitting layer 262 are respectively emitted. The color light can generate a micro-resonator effect in the corresponding micro-resonant cavity, so that the first light-emitting area A and the second light-emitting area B respectively display the first color light IA and the second color light IB.

In detail, the color light emitted by the first patterned light-emitting layer 162 and the second patterned light-emitting layer 262 will be mixed into the first color light IA and emitted from the first light-emitting area A, and the first light-emitting layer 160 and the second light-emitting layer will emit light. The color light emitted by the layer 260 is mixed into the second color light IB and emitted from the second light emitting area B. As shown in FIG. Specifically, in this embodiment, the first color light IA is yellow light, and the second color light IB is blue light. In this way, when the white light emitting element 10 is used for lighting, the first color light IA and the second color light IB will be mixed into white light; and when the white light emitting element 10 is used in a display, a red color can be set in the first light emitting area A The filter layer and the green filter layer can obtain red light and green light without any blue filter layer.

From another point of view, in this embodiment, the first patterned light-emitting layer 162 and the second patterned light-emitting layer 262 are located in the first light-emitting area A, so as to be continuously distributed in the first light-emitting area A and the second light-emitting area A. The first light-emitting layer 160 and the second light-emitting layer 260 in the light-emitting region B can be designed without considering the light-emitting efficiency of the first patterned light-emitting layer 162 and the first patterned light-emitting layer 262, and thus can be effectively optimized from the second patterned light-emitting layer The second color light IB formed by the mixed color light emitted by the first light emitting layer 160 and the second light emitting layer 260 in the light emitting area B can improve the luminous efficiency of the second color light IB.

Further, in this embodiment, the second color light IB is formed by mixing the color lights emitted by the two light-emitting layers (ie, the first light-emitting layer 160 and the second light-emitting layer 260 ) in the second light-emitting region B. It can be optimized and both the first light-emitting layer 160 and the second light-emitting layer 260 are blue light-emitting layers, so compared with the existing stacked white light-emitting device in which the blue light-emitting diode element and the red-green light-emitting diode element are stacked together, The blue light efficiency of the white light emitting element 10 is high. In view of this, compared with the existing stacked white light element, the white light emitting element 10 can obtain blue light with a relatively high brightness at a lower operating current, thereby effectively prolonging the use of the first light emitting layer 160 and the second light emitting layer 260 Long service life, solving the problems of light color change and poor reliability after long-term operation of the existing stacked white light components. On the other hand, as mentioned above, when the white light emitting element 10 is applied to a display, it is not necessary to provide any blue filter layer, thereby maintaining the blue light efficiency of the white light emitting element 10 .

Further, it can be confirmed by the simulated luminescence experiments that the white light emitting element 10 of the present invention has good blue light efficiency. FIG. 2 is a graph showing the relationship between the wavelength and the intensity of light emitted by the white light emitting element of FIG. 1 and the conventional stacked white light emitting element. In detail, the existing stacked white light elements used in the simulation experiments are the existing stacked white light elements in which blue light emitting diode elements and red-green light emitting diode elements are stacked together. It can be seen from FIG. 2 that, compared with the existing stacked white light element, the white light emitting element 10 of the present invention can emit blue light with stronger intensity.

Based on the first embodiment, the first light-emitting unit U1 includes a first light-emitting layer 160 located in the first light-emitting area A and the second light-emitting area B and a first patterned light-emitting layer 162 located in the first light-emitting area A , and the second light-emitting unit U2 includes a second light-emitting layer 260 located in the first light-emitting area A and the second light-emitting area B and a second patterned light-emitting layer 262 located in the first light-emitting area A, thereby enabling the design of the first light-emitting layer 260 When a light-emitting layer 160 and a second light-emitting layer 260 are used, the light-emitting efficiency of the first patterned light-emitting layer 162 and the second patterned light-emitting layer 262 may not be considered, so that the second color light IB can be effectively optimized to improve the second color light IB luminous efficiency. In this way, the white light emitting element 10 can solve the problems of the existing stacked white light emitting element such as light color change and poor reliability after long-term operation.

In addition, although in the first embodiment, the first light emitting unit U1 includes the first patterned light emitting layer 162 located in the first light emitting area A, and the second light emitting unit U2 includes the second pattern located in the first light emitting area A The luminescent layer 262, but the present invention is not limited to this. In detail, as long as at least one of the first light-emitting unit U1 and the second light-emitting unit U2 includes at least one patterned light-emitting layer located in the first light-emitting area A or the second light-emitting area B, it falls within the scope of the present invention . That is, in other embodiments, the first light-emitting unit U1 may include two patterned light-emitting layers located in the first light-emitting area A; or in other embodiments, the first light-emitting unit U1 may include two patterned light-emitting layers located in the first light-emitting area A; One patterned light-emitting layer in the area A, and the second light-emitting unit U2 may include one patterned light-emitting layer in the second light-emitting area B.

In addition, although in the first embodiment, the white light emitting element 10 includes only the first light emitting region A and the second light emitting region B, the present invention is not limited thereto. In other embodiments, the white light emitting element may also include at least a first light emitting region A and a second light emitting region B.

Hereinafter, other embodiments will be described with reference to FIGS. 3 to 6 . It must be noted here that the following embodiments use the element symbols and part of the content of the previous embodiment, wherein the same or similar symbols are used to represent the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted part, reference may be made to the foregoing embodiments, and repeated descriptions in the following embodiments will not be repeated.

3 is a schematic cross-sectional view of a white light emitting element according to a second embodiment of the present invention. Please refer to FIG. 3 and FIG. 1 at the same time, the white light emitting element 30 of the second embodiment is similar to the white light emitting element 10 of the first embodiment, the main difference is: in the white light emitting element 30, the first light emitting unit U1 includes two patterns In the white light emitting element 10, the first light emitting unit U1 and the second light emitting unit U2 each include a pattern A light-emitting layer is formed, and the second light-emitting unit U2 includes a patterned hole transport layer. In view of this, in the second embodiment, the substrate 300, the element layer 310, the first electrode layer 320, the electrode patterns 320a-320b, the hole injection layer 330, the hole transport layer 340, the first patterned light-emitting layer 362, The electron transport layer 370 , the electron injection layer 380 , the hole injection layer 430 , the hole transport layer 440 , the electron transport layer 470 , the electron injection layer 480 and the second electrode layer 490 may be the same as those in the aforementioned first embodiment or Similar, so the relevant description will not be repeated. Hereinafter, the differences between the two will be explained.

Referring to FIG. 3 , in this embodiment, the first light-emitting unit U1 includes a second patterned light-emitting layer 364 . In detail, in this embodiment, the second patterned light-emitting layer 364 is disposed between the first electrode layer 320 and the first light-emitting layer 360, and the first patterned light-emitting layer 362 is disposed between the first electrode layer 320 and the first light-emitting layer 362. between the two patterned light-emitting layers 364 . That is to say, the first patterned light-emitting layer 362 , the second patterned light-emitting layer 364 and the first light-emitting layer 360 are sequentially disposed on the first electrode layer 320 . On the other hand, in the present embodiment, the second patterned light emitting layer 364 is located in the first light emitting area A and not located in the second light emitting area B. That is, in this embodiment, the first patterned light-emitting layer 362 and the second patterned light-emitting layer 364 are sequentially arranged on the electrode pattern 320a. The second patterned light-emitting layer 364 is formed using, for example, an evaporation process and a corresponding FMM or inkjet process. In addition, in this embodiment, the second patterned light-emitting layer 364 is a green light-emitting layer. That is, in this embodiment, the second patterned light-emitting layer 364 includes a green light-emitting material.

In this embodiment, the first light-emitting unit U1 includes a hole transport layer 350 disposed between the first electrode layer 320 and the first patterned light-emitting layer 362 to meet the requirements of the first patterned light-emitting layer 362 and the second patterned light-emitting layer 362 The optical thickness of the light emitted by the light-emitting layer 364 . In detail, in this embodiment, the hole transport layer 350 is located in the first light emitting region A. As shown in FIG. That is, the hole transport layer 350 is a patterned hole transport layer. The hole transport layer 350 is formed by, for example, an evaporation process combined with an FMM or an inkjet process. The material of the hole transport layer 350 includes, for example, triaromatic amines, cross-structured diamine biphenyls, diamine biphenyl derivatives or other suitable materials, and may be the same as or different from the hole transport layer 340 .

In this embodiment, the first light emitting unit U1 includes the first light emitting layer 360 disposed on the first electrode layer 320 . Specifically, in this embodiment, the first light-emitting layer 360 is located in the first light-emitting region A and the second light-emitting region B. More specifically, in this embodiment, in the first light-emitting region A, the first light-emitting layer 360 covers the first patterned light-emitting layer 362 and the second patterned light-emitting layer 364 . From another point of view, in this embodiment, the first patterned light-emitting layer 362 and the second patterned light-emitting layer 364 are only located in the first light-emitting area A, and the first light-emitting layer 360 is a continuous structure layer, Continuously distributed in the first light-emitting area A and the second light-emitting area B. It is worth mentioning that, in this embodiment, since the first light-emitting layer 360 is a continuous structure layer, the first light-emitting layer 360 does not need to be formed by using FMM. In detail, in this embodiment, the first light emitting layer 360 is formed by, for example, an evaporation process or an inkjet process and a common metal mask.

In addition, in this embodiment, the first light-emitting layer 360 is a blue light-emitting layer. That is, in this embodiment, the first light-emitting layer 360 includes a blue light-emitting material. From another viewpoint, in this embodiment, the first light emitting layer 360 is a blue light common layer. It is worth mentioning that, in this embodiment, the first light-emitting layer 360 needs to use a material with a faster electron mobility, so that the first light-emitting layer 360 covers the first patterned light-emitting layer 362 and the second patterned light-emitting layer. In the first light-emitting region A of 364, electrons and holes are easily combined in the first patterned light-emitting layer 362 and the second patterned light-emitting layer 364 to emit light. That is, in this embodiment, the first light-emitting layer 360 located in the first light-emitting region A functions as an electron transport layer. On the other hand, in this embodiment, the light emitted by the first light emitting layer 360 located in the second light emitting region B can be optimized through the micro resonant cavity effect.

In this embodiment, the second light-emitting unit U2 includes the second light-emitting layer 460 disposed on the connection layer R. As shown in FIG. Specifically, in this embodiment, the second light emitting layer 460 is located in the first light emitting region A and the second light emitting region B. That is to say, in this embodiment, the second light emitting layer 460 is a continuous structure layer, which is continuously distributed in the first light emitting area A and the second light emitting area B. It is worth mentioning that, in this embodiment, since the second light-emitting layer 460 is a continuous structure layer, the second light-emitting layer 460 does not need to be formed using FMM. In detail, in this embodiment, the second light emitting layer 460 is formed by, for example, an evaporation process or an inkjet process and a common metal mask.

In addition, in this embodiment, the second light-emitting layer 460 is a blue light-emitting layer. That is, in this embodiment, the second light-emitting layer 460 includes a blue light-emitting material. From another viewpoint, in this embodiment, the second light emitting layer 460 is a blue light common layer. From another viewpoint, in this embodiment, the first light-emitting layer 360 and the second light-emitting layer 460 can emit the same color light. It is worth mentioning that, in this embodiment, the light emitted by the second light-emitting layer 460 can be emitted from the first light-emitting region A and the second light-emitting region B to the outside through the micro-resonant cavity effect.

Based on the first embodiment, in this embodiment, the white light-emitting element 30 drives the first light-emitting layer 360 and the first patterned light-emitting layer 362 by generating a voltage difference between the first electrode layer 320 and the second electrode layer 490 , the second patterned light-emitting layer 364 and the second light-emitting layer 460 emit light. It is worth mentioning that, in this embodiment, between the first electrode layer 320 and the second electrode layer 490 in the first light-emitting area A, and the first electrode layer 320 and the second electrode layer in the second light-emitting area B A micro-resonant cavity can be formed between the 490 , so that the color light emitted by the first light-emitting layer 360 , the first patterned light-emitting layer 362 , the second patterned light-emitting layer 364 and the second light-emitting layer 460 can be matched to the corresponding light-emitting layers. The micro-resonator effect is generated in the micro-resonator, so that the first light-emitting area A and the second light-emitting area B respectively display the first color light 3IA and the second color light 3IB.

In detail, as described above, in the white light-emitting element 30, the light emitted by the first light-emitting layer 360 and the second light-emitting layer 460 in the second light-emitting region B can be optimized through the micro-resonator effect, thereby The color light emitted by the first patterned light-emitting layer 362, the second patterned light-emitting layer 364 and the second light-emitting layer 460 will be mixed into the first color light 3IA and emitted from the first light-emitting area A, and the first light-emitting layer 360 and the The color light emitted by the two light-emitting layers 460 is mixed into the second color light 3IB and emitted from the second light-emitting region B. As shown in FIG. Specifically, in this embodiment, the first color light 3IA is a mixed color light of yellow light and blue light, and the second color light IB is blue light. In this way, when the white light emitting element 30 is used for lighting, the first color light 3IA and the second color light 3IB will be mixed into white light; and when the white light emitting element 30 is used in a display, red color can be set in the first light emitting area A The filter layer and the green filter layer or the red filter layer, the green filter layer and the wavelength conversion layer are arranged to obtain red light and green light without any blue filter layer.

From another point of view, in this embodiment, the first patterned light-emitting layer 362 and the second patterned light-emitting layer 364 are located in the first light-emitting region A, so as to be continuously distributed in the first light-emitting region A and the second light-emitting region A. The first light-emitting layer 360 and the second light-emitting layer 460 in the light-emitting area B can be designed without considering the light-emitting efficiency of the first patterned light-emitting layer 362 and the second patterned light-emitting layer 364, and thus can be effectively optimized from the second patterned light-emitting layer 362 and the second patterned light-emitting layer 364. The second color light 3IB formed by the mixed color light emitted by the first light emitting layer 360 and the second light emitting layer 460 in the light emitting area B can improve the luminous efficiency of the second color light 3IB.

Further, in this embodiment, the second color light 3IB is formed by mixing the color lights emitted by the two light-emitting layers (ie, the first light-emitting layer 360 and the second light-emitting layer 460 ) in the second light-emitting region B. It can be optimized, the light emitted by the second light emitting layer 460 in the first light emitting area A can be emitted to the outside, and both the first light emitting layer 360 and the second light emitting layer 460 are blue light emitting layers, so it is different from the blue light emitting layer. Compared with the existing stacked white light element in which the light emitting diode elements and the red-green light emitting diode elements are stacked together, the blue light efficiency of the white light emitting element 30 is higher. In view of this, compared with the existing stacked white light emitting element, the white light emitting element 30 can obtain blue light with a corresponding brightness at a lower operating current, thus effectively prolonging the use of the first light emitting layer 360 and the second light emitting layer 460 Long service life, solving the problems of light color change and poor reliability after long-term operation of the existing stacked white light components. On the other hand, as mentioned above, when the white light emitting element 30 is applied to a display, it is not necessary to provide any blue filter layer, thereby maintaining the blue light efficiency of the white light emitting element 30 .

Further, it can be confirmed by simulated light emission experiments that the white light emitting element 30 of the present invention has good blue light efficiency. FIG. 4 is a graph showing the relationship between the wavelength and the intensity of the light emitted by the white light emitting element of FIG. 3 and the conventional stacked white light emitting element. In detail, the existing stacked white light elements used in the simulation experiments are the existing stacked white light elements in which blue light emitting diode elements and red-green light emitting diode elements are stacked together. It can be seen from FIG. 4 that, compared with the existing stacked white light element, the white light emitting element 30 of the present invention can emit blue light with stronger intensity.

Based on the first and second embodiments, the first light-emitting unit U1 includes the first light-emitting layer 360 in the first light-emitting area A and the second light-emitting area B and the first patterned pattern in the first light-emitting area A The light-emitting layer 362 and the second patterned light-emitting layer 364, and the second light-emitting unit U2 include the second light-emitting layer 460 located in the first light-emitting area A and the second light-emitting area B, thereby enabling the design of the first light-emitting layer 360 and the second light-emitting layer 460. The second light emitting layer 460 does not need to consider the luminous efficiency of the first patterned light emitting layer 362 and the second patterned light emitting layer 364, thereby effectively optimizing the second color light 3IB to improve the luminous efficiency of the second color light 3IB. In this way, the white light emitting element 30 can solve the problems of the existing stacked white light emitting element such as light color change and poor reliability after long-term operation.

5 is a schematic cross-sectional view of a white light emitting element according to a third embodiment of the present invention. 5, the white light emitting element 50 includes a first light emitting unit U1, a second light emitting unit U2 and a connection layer R, wherein the first light emitting unit U1 includes a first electrode layer 520, a first light emitting layer 560, a first patterned light emitting unit Layer 562 and the second patterned light-emitting layer 564 , the second light-emitting unit U2 includes a second electrode layer 690 and a second light-emitting layer 660 . In addition, in this embodiment, the white light emitting element 50 may further include a substrate 500 , an element layer 510 , a hole injection layer 530 , a hole transport layer 540 , a hole transport layer 550 , a hole transport layer 552 , and an electron transport layer 570 , an electron injection layer 580, a hole injection layer 630, a hole transport layer 640, an electron transport layer 670, and an electron injection layer 680, wherein the first light-emitting unit U1 includes a hole injection layer 530, a hole transport layer 540, and a hole transport layer layer 550 , hole transport layer 552 , electron transport layer 570 , electron injection layer 580 , and the second light emitting unit U2 includes hole injection layer 630 , hole transport layer 640 , electron transport layer 670 , electron injection layer 680 . Hereinafter, each of the above-mentioned members will be described in detail.

The substrate 500 has a first light emitting region A, a second light emitting region B, and a third light emitting region C. In this embodiment, the first light-emitting area A, the second light-emitting area B, and the third light-emitting area C are respectively used to display color light of different colors. In this embodiment, the first light-emitting region A, the second light-emitting region B, and the third light-emitting region C can be arranged in parallel, that is, the first light-emitting region A and the second light-emitting region B are arranged adjacent to each other, and the second light-emitting region B is disposed adjacent to the third light emitting area C, but not limited thereto. In addition, in this embodiment, the material of the substrate 500 is, for example, glass, quartz, organic polymer, metal, or the like.

The element layer 510 is disposed on the substrate 500 . In this embodiment, the element layer 510 may be any active element layer known to those skilled in the art. Specifically, in this embodiment, the element layer 510 may include a plurality of driving elements such as TFTs and capacitors, but the present invention is not limited thereto.

The first electrode layer 520 is disposed on the substrate 500 . In detail, in this embodiment, the first electrode layer 520 includes an electrode pattern 520a, an electrode pattern 520b and an electrode pattern 520c which are separated from each other, wherein the electrode pattern 520a is located in the first light-emitting area A, and the electrode pattern 520b is located in the second light-emitting area A In the region B, the electrode pattern 520c is located in the third light emitting region C. As shown in FIG. That is, in this embodiment, the first electrode layer 520 is a patterned electrode layer, and the first electrode layer 520 is located in the first light emitting area A, the second light emitting area B, and the third light emitting area C.

In this embodiment, the first electrode layer 520 may be formed by any method of manufacturing an electrode layer known to those skilled in the art. For example, in one embodiment, the method of forming the first electrode layer 520 includes the following steps: forming an electrode material layer on the substrate 500 using a CVD process or a PVD process, and then patterning the electrode material layer using a lithography etching process change. For another example, in one embodiment, the method of forming the first electrode layer 520 includes performing a printing and spraying process.

In addition, in this embodiment, the material of the first electrode layer 520 may include a reflective material, such as a conductive material such as metal, alloy, metal oxide, or a stacked layer of a metal and a transparent metal oxide conductive material. The metal oxide conductive material is, for example, indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, or other suitable oxides. That is to say, in this embodiment, the first electrode layer 520 is a reflective electrode layer, whereby the white light emitting element 50 is of a top emission type design.

The hole injection layer 530 and the hole transport layer 540 are sequentially arranged on the first electrode layer 520 . In detail, in this embodiment, the hole injection layer 530 and the hole transport layer 540 are all located in the first light emitting region A, the second light emitting region B, and the third light emitting region C. In addition, the method for forming the hole injection layer 530 and the hole transport layer 540 includes, for example, performing an evaporation process or an inkjet process. The material of the hole injection layer 530 includes, for example, phthalocyanine copper, star-shaped aromatic amines, polyaniline, polyethylene dioxythiophene, or other suitable materials. The material of the hole transport layer 540 includes, for example, triaromatic amines, cross-structured diamine biphenyls, diamine biphenyl derivatives, or other suitable materials. It is worth mentioning that, in this embodiment, the white light emitting element 50 includes a hole injection layer 530 and a hole transport layer 540, but the present invention is not limited thereto. In other embodiments, the white light emitting element 50 may only include the hole injection layer 530 or the hole transport layer 540 , or the white light emitting element 50 may not include the hole injection layer 530 and the hole transport layer 540 . That is, the configuration of the hole injection layer 530 and the hole transport layer 540 is optional.

The hole transport layer 550 is disposed between the first electrode layer 520 and the first patterned light-emitting layer 562 to satisfy the optical thickness of the light emitted by the first patterned light-emitting layer 562 . In detail, in this embodiment, the hole transport layer 550 is located in the first light emitting region A. As shown in FIG. That is, the hole transport layer 550 is a patterned hole transport layer. The hole transport layer 550 is formed by, for example, an evaporation process combined with an FMM or an inkjet process. The material of the hole transport layer 550 includes, for example, triaromatic amines, cross-structured diamine biphenyls, diamine biphenyl derivatives or other suitable materials, and may be the same as or different from the hole transport layer 540 .

The hole transport layer 552 is disposed between the first electrode layer 520 and the second patterned light-emitting layer 564 to satisfy the optical thickness of the light emitted by the second patterned light-emitting layer 564 . In detail, in this embodiment, the thickness of the hole transport layer 552 is smaller than the thickness of the hole transport layer 550 . In addition, in the present embodiment, the hole transport layer 552 is located in the second light emitting region B. As shown in FIG. That is, the hole transport layer 552 is a patterned hole transport layer. The hole transport layer 552 is formed by, for example, an evaporation process combined with an FMM or an inkjet process. The material of the hole transport layer 552 includes, for example, triaromatic amines, cross-structured diamine biphenyls, diamine biphenyl derivatives or other suitable materials, and can be the same as or different from the hole transport layer 540, and can be the same as the hole transport layer 540. Transport layers 550 are the same or different.

The first patterned light-emitting layer 562 is disposed between the first electrode layer 520 and the first light-emitting layer 560 . In detail, in this embodiment, the first patterned light-emitting layer 562 is disposed on the side of the hole transport layer 550 opposite to the first electrode layer 520 . In addition, in the present embodiment, the first patterned light emitting layer 562 is located in the first light emitting area A and not located in the second light emitting area B. The first patterned light-emitting layer 562 is formed using, for example, an evaporation process and a corresponding FMM or inkjet process. In addition, in this embodiment, the first patterned light-emitting layer 562 is a red light-emitting layer. That is, in this embodiment, the first patterned light-emitting layer 562 includes a red light-emitting material.

The second patterned light-emitting layer 564 is disposed between the first electrode layer 520 and the first light-emitting layer 560 . Specifically, in this embodiment, the second patterned light-emitting layer 564 is disposed on the side of the hole transport layer 552 opposite to the first electrode layer 520 . In addition, in the present embodiment, the second patterned light-emitting layer 564 is located in the second light-emitting area B and not located in the first light-emitting area A. The second patterned light-emitting layer 564 is formed using, for example, an evaporation process and a corresponding FMM or inkjet process. In addition, in this embodiment, the second patterned light-emitting layer 564 is a green light-emitting layer. That is, in this embodiment, the second patterned light-emitting layer 564 includes a green light-emitting material.

The first light-emitting layer 560 is disposed on the first electrode layer 520 . In detail, in this embodiment, the first light-emitting layer 560 is located in the first light-emitting region A, the second light-emitting region B, and the third light-emitting region C. In more detail, in this embodiment, in the first light-emitting area A, the first light-emitting layer 560 covers the first patterned light-emitting layer 562; and in the second light-emitting area B, the first light-emitting layer 560 covers the second light-emitting layer 560 The light emitting layer 564 is patterned. From another point of view, in this embodiment, the first patterned light-emitting layer 562 is only located in the first light-emitting area A, the second patterned light-emitting layer 564 is only located in the second light-emitting area B, and the first light-emitting layer 560 is a continuous structure layer, which is continuously distributed in the first light emitting area A, the second light emitting area B and the third light emitting area C. It is worth mentioning that, in this embodiment, since the first light-emitting layer 560 is a continuous structure layer, the first light-emitting layer 560 does not need to be formed by using FMM. In detail, in this embodiment, the first light emitting layer 560 is formed by, for example, an evaporation process or an inkjet process and a common metal mask.

In addition, in this embodiment, the first light-emitting layer 560 is a blue light-emitting layer. That is, in the present embodiment, the first light-emitting layer 560 includes a blue light-emitting material. From another viewpoint, in this embodiment, the first light emitting layer 560 is a blue light common layer. It is worth mentioning that, in this embodiment, the first light-emitting layer 560 needs to select a material with a faster electron mobility, so that in the first light-emitting area A where the first light-emitting layer 560 covers the first patterned light-emitting layer 562 , electrons and holes are easy to combine in the first patterned light-emitting layer 562 to emit light, and in the second light-emitting region B where the first light-emitting layer 560 covers the second patterned light-emitting layer 564, electrons and holes are easy to be combined in the second light-emitting region B. The patterned light-emitting layer 564 is combined to emit light. That is, in this embodiment, the first light-emitting layer 560 located in the first light-emitting region A and the second light-emitting region B functions as an electron transport layer. On the other hand, in this embodiment, the light emitted by the first light emitting layer 560 located in the third light emitting region C can be optimized through the micro resonant cavity effect.

The electron transport layer 570 and the electron injection layer 580 are sequentially arranged on the first light emitting layer 560 . Specifically, in this embodiment, the electron injection layer 570 and the electron transport layer 580 are all located in the first light emitting region A, the second light emitting region B, and the third light emitting region C. In addition, the method for forming the electron transport layer 570 and the electron injection layer 580 includes, for example, performing an evaporation process or an inkjet process. The material of the electron transport layer 570 includes, for example, oxazole derivatives and their dendrimers, metal chelates, azole compounds, diazanthracene derivatives, silicon-containing heterocyclic compounds or other suitable materials. The material of the electron injection layer 580 includes, for example, lithium oxide, lithium boron oxide, potassium silicon oxide, cesium carbonate, sodium acetate, lithium fluoride or other suitable materials. It is worth mentioning that, in this embodiment, the white light emitting element 50 includes an electron transport layer 570 and an electron injection layer 580, but the present invention is not limited thereto. In other embodiments, the white light emitting element 50 may only include the electron transport layer 570 or the electron injection layer 580 , or the white light emitting element 50 may not include the electron transport layer 570 and the electron injection layer 580 . That is, the configuration of the electron transport layer 570 and the electron injection layer 580 is optional.

The connection layer R is located between the first light-emitting unit U1 and the second light-emitting unit U2, so as to connect the first light-emitting unit U1 and the second light-emitting unit U2 in series. In this embodiment, the connection layer R includes a conductive material, such as molybdenum oxide (Molybdenum trioxide, MoO3), tungsten oxide (Tungsten trioxide, WO3), lithium or cesium.

The hole injection layer 630 and the hole transport layer 640 are arranged on the connection layer R in this order. Specifically, in this embodiment, the hole injection layer 630 and the hole transport layer 640 are all located in the first light-emitting region A, the second light-emitting region B, and the third light-emitting region C. In addition, the method for forming the hole injection layer 630 and the hole transport layer 640 includes, for example, performing an evaporation process or an inkjet process. The material of the hole injection layer 630 includes, for example, phthalocyanine copper, star-shaped aromatic amines, polyaniline, polyethylene dioxythiophene, or other suitable materials. The material of the hole transport layer 640 includes, for example, triaromatic amines, cross-structured diamine biphenyls, diamine biphenyl derivatives, or other suitable materials. It is worth mentioning that, in this embodiment, the white light emitting element 50 includes a hole injection layer 630 and a hole transport layer 640, but the present invention is not limited thereto. In other embodiments, the white light emitting element 50 may only include the hole injection layer 630 or the hole transport layer 640 , or the white light emitting element 50 may not include the hole injection layer 630 and the hole transport layer 640 . That is, the configuration of the hole injection layer 630 and the hole transport layer 640 is optional.

The second light-emitting layer 660 is disposed on the connection layer R. As shown in FIG. Specifically, in this embodiment, the second light-emitting layer 660 is located in the first light-emitting region A, the second light-emitting region B, and the third light-emitting region C. That is to say, the second light-emitting layer 660 is a continuous structure layer, and is continuously distributed in the first light-emitting region A, the second light-emitting region B, and the third light-emitting region C. It is worth mentioning that, in this embodiment, since the second light-emitting layer 660 is a continuous structure layer, the second light-emitting layer 660 does not need to be formed by using FMM. In detail, in this embodiment, the second light emitting layer 660 is formed by, for example, an evaporation process or an inkjet process and a common metal mask.

In addition, in this embodiment, the second light-emitting layer 660 is a blue light-emitting layer. That is, in this embodiment, the second light-emitting layer 660 includes a blue light-emitting material. From another viewpoint, in this embodiment, the second light emitting layer 660 is a blue light common layer. From another viewpoint, in this embodiment, the first light-emitting layer 560 and the second light-emitting layer 660 can emit the same color light. It is worth mentioning that in this embodiment, the light emitted by the second light-emitting layer 660 can be emitted from the first light-emitting region A, the second light-emitting region B, and the third light-emitting region C to the outside through the micro-resonant cavity effect. .

The electron transport layer 670 and the electron injection layer 680 are sequentially arranged on the second light emitting layer 660 . In detail, in this embodiment, the electron injection layer 670 and the electron transport layer 680 are all located in the first light emitting region A, the second light emitting region B, and the third light emitting region C. In addition, the method for forming the electron transport layer 670 and the electron injection layer 680 includes, for example, performing an evaporation process or an inkjet process. The material of the electron transport layer 670 includes, for example, oxazole derivatives and their dendrimers, metal chelates, azole compounds, diazanthracene derivatives, silicon-containing heterocyclic compounds or other suitable materials. The material of the electron injection layer 680 includes, for example, lithium oxide, lithium boron oxide, potassium silicon oxide, cesium carbonate, sodium acetate, lithium fluoride or other suitable materials. It is worth mentioning that, in this embodiment, the white light emitting element 50 includes an electron transport layer 670 and an electron injection layer 680, but the present invention is not limited thereto. In other embodiments, the white light emitting element 50 may only include the electron transport layer 670 or the electron injection layer 680 , or the white light emitting element 50 may not include the electron transport layer 670 and the electron injection layer 680 . That is, the configuration of the electron transport layer 670 and the electron injection layer 680 is optional.

The second electrode layer 690 is disposed on the second light emitting layer 660 . Specifically, in this embodiment, the second electrode layer 690 is located in the first light emitting region A, the second light emitting region B, and the third light emitting region C. In this embodiment, the material of the second electrode layer 690 includes, for example, a transparent metal oxide conductive material, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, and indium germanium zinc oxide. or other suitable oxides; metals; or stacks of at least two of the above. That is, in this embodiment, the second electrode layer 690 may be a transparent electrode layer or a semi-transmissive and semi-reflective electrode layer.

In addition, in this embodiment, the first electrode layer 520 serves as an anode, and the second electrode layer 690 serves as a cathode. However, it must be noted that, for design requirements, the first electrode layer 520 may also be used as a cathode, and the second electrode layer 690 may be used as an anode. Further, the white light emitting element 50 drives the first light emitting layer 560 , the first patterned light emitting layer 562 , the second patterned light emitting layer 564 and the The second light emitting layer 660 emits light.

It is worth mentioning that, in the white light emitting element 50, between the first electrode layer 520 and the second electrode layer 690 in the first light emitting area A, the first electrode layer 520 and the second electrode in the second light emitting area B Micro-resonance cavities can be formed between the layers 690 and between the first electrode layer 520 and the second electrode layer 690 in the third light-emitting region C, respectively, so that the first light-emitting layer 560, the first patterned light-emitting layer 562, The color light emitted by the second patterned light-emitting layer 564 and the second light-emitting layer 660 respectively can generate a micro-resonator effect in the corresponding micro-resonator, thereby making the first light-emitting area A, the second light-emitting area B and the third light-emitting area C shows the first color light 5IA, the second color light 5IB, and the third color light 5IC, respectively.

In detail, as mentioned above, in the white light-emitting element 50, the light emitted by the first light-emitting layer 560 and the second light-emitting layer 660 in the third light-emitting region C can be optimized through the micro-resonator effect, thereby The color light emitted by the first patterned light-emitting layer 562 and the second light-emitting layer 660 will be mixed into the first color light 5IA and emitted from the first light-emitting area A, and the color light emitted by the second patterned light-emitting layer 564 and the second light-emitting layer 660 will be emitted. The color light is mixed into the second color light 5IB and emitted from the second light emitting region B, and the color light emitted by the first light emitting layer 560 and the second light emitting layer 660 is mixed into the third color light 5IC and emitted from the third light emitting region C. Specifically, in this embodiment, the first color light 5IA is a mixed color light of red light and blue light, the second color light 5IB is a mixed color light of green light and blue light, and the third color light 5IC is blue light. In this way, when the white light emitting element 50 is used for lighting, the first color light 5IA, the second color light 5IB and the third color light 5IC will be mixed into white light; and when the white light emitting element 50 is used in a display, the first color light 5IA, the second color light 5IB and the third color light 5IC will be mixed into white light. A red filter layer or a red wavelength conversion layer is arranged in the area A to obtain red light, and a green filter layer or a green wavelength conversion layer is arranged in the second light-emitting area B to obtain green light without any blue filter. Floor.

From another point of view, in this embodiment, the first patterned light-emitting layer 562 is located in the first light-emitting region A and the second patterned light-emitting layer 564 is located in the second light-emitting region B, thereby making the continuous distribution in the first light-emitting region A. The first light-emitting layer 560 and the second light-emitting layer 660 in the light-emitting area A, the second light-emitting area B, and the third light-emitting area C can be designed without considering the first patterned light-emitting layer 562 and the second patterned light-emitting layer 564 The luminous efficiency of the third color light 5IC can be effectively optimized, and the third color light 5IC formed by the color light emitted by the first light emitting layer 560 and the second light emitting layer 660 in the third light emitting area C can be effectively optimized, so as to improve the emission of the third color light 5IC. efficiency.

Further, in this embodiment, the third color light 5IC is formed by mixing the color lights emitted by the two light-emitting layers (ie, the first light-emitting layer 560 and the second light-emitting layer 660 ) in the third light-emitting region C. It can be optimized that the light emitted by the second light emitting layer 660 located in the first light emitting area A and the second light emitting area B can be emitted to the outside, and both the first light emitting layer 560 and the second light emitting layer 660 are blue light emitting layers Therefore, compared with the existing stacked white light element in which the blue light emitting diode element and the red-green light emitting diode element are stacked together, the blue light efficiency of the white light emitting element 50 is higher. In view of this, compared with the existing stacked white light emitting element, the white light emitting element 50 can obtain blue light with a considerable brightness at a lower operating current, thereby effectively prolonging the use of the first light emitting layer 560 and the second light emitting layer 660 Long service life, solving the problems of light color change and poor reliability after long-term operation of the existing stacked white light components. On the other hand, as mentioned above, when the white light emitting element 50 is applied to a display, it is not necessary to provide any blue filter layer, thereby maintaining the blue light efficiency of the white light emitting element 50 .

Further, it can be confirmed by the simulated luminescence experiment that the white light emitting element 50 of the present invention has good blue light efficiency. FIG. 6 is a graph showing the relationship between the wavelength and the intensity of light emitted by the white light emitting element of FIG. 5 and the conventional stacked white light emitting element. In detail, the existing stacked white light elements used in the simulation experiments are the existing stacked white light elements in which blue light emitting diode elements and red-green light emitting diode elements are stacked together. It can be seen from FIG. 6 that, compared with the existing stacked white light element, the white light emitting element 50 of the present invention can emit blue light with stronger intensity.

Based on the first and third embodiments, the first light-emitting unit U1 includes the first light-emitting layer 560 located in the first light-emitting area A, the second light-emitting area B and the third light-emitting area C, and is located in the first light-emitting area A The first patterned light-emitting layer 562 and the second patterned light-emitting layer 564 in the second light-emitting area B, and the second light-emitting unit U2 includes the first light-emitting area A, the second light-emitting area B and the third light-emitting area The second light-emitting layer 660 in C makes it unnecessary to consider the light-emitting efficiency of the first patterned light-emitting layer 562 and the second patterned light-emitting layer 564 when designing the first light-emitting layer 560 and the second light-emitting layer 660, and further The third color light 5IC can be effectively optimized to improve the luminous efficiency of the third color light 5IC. In this way, the white light emitting element 50 can solve the problems of the existing stacked white light emitting element such as the change of light color and poor reliability after long-term operation.

To sum up, the white light emitting element proposed in the foregoing embodiments includes a first light emitting unit, a second light emitting unit, and a connecting layer connecting the first light emitting unit and the second light emitting unit, wherein the first light emitting unit includes a first light emitting unit located in the first light emitting area and a first light-emitting layer in a second light-emitting area, the second light-emitting unit includes a second light-emitting layer located in the first light-emitting area and the second light-emitting area, and at least one of the first light-emitting unit and the second light-emitting unit includes At least one patterned light-emitting layer located in the first light-emitting region or the second light-emitting region, so that the light-emitting efficiency of the patterned light-emitting layer can be effectively eliminated when designing the first light-emitting layer and the second light-emitting layer. The color light emitted by the first light-emitting layer and the second light-emitting layer is optimized to improve the luminous efficiency of the color light. In this way, the white light emitting device can solve the problems of the existing stacked white light emitting device such as the change of light color and poor reliability after long-term operation.

Although the present invention has been disclosed above in embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the appended patent application.

Claims (9)

1. A white light emitting device having a first light emitting region and a second light emitting region, the white light emitting device comprising:

a first light emitting unit comprising:

a first electrode layer; and

a first light emitting layer disposed on the first electrode layer and located in the first light emitting region and the second light emitting region;

a second light emitting unit including:

a second light emitting layer in the first light emitting region and the second light emitting region; and

a second electrode layer disposed on the second light emitting layer; and

a connection layer between the first light emitting unit and the second light emitting unit to connect the first light emitting unit and the second light emitting unit in series, wherein at least one of the first light emitting unit and the second light emitting unit comprises at least one patterned light emitting layer located in the first light emitting region or the second light emitting region;

the first light-emitting layer is a blue light-emitting layer, and the second light-emitting layer is a blue light-emitting layer.

2. The white light emitting device of claim 1, wherein the at least one patterned light emitting layer comprises a first patterned light emitting layer and a second patterned light emitting layer.

3. The white light emitting device of claim 2, wherein the first patterned light emitting layer is in the first light emitting region and not in the second light emitting region, and the second patterned light emitting layer is in the first light emitting region and not in the second light emitting region.

4. The white light emitting device of claim 3, wherein:

the first light-emitting unit comprises the first patterned light-emitting layer, wherein the first patterned light-emitting layer is arranged between the first electrode layer and the first light-emitting layer; and

the second light-emitting unit comprises a second patterned light-emitting layer, and the second patterned light-emitting layer is arranged between the connecting layer and the second light-emitting layer.

5. The white light emitting device of claim 3, wherein:

the first light-emitting unit comprises a first patterned light-emitting layer and a second patterned light-emitting layer, the first patterned light-emitting layer and the second patterned light-emitting layer are arranged between the first electrode layer and the first light-emitting layer, and the first patterned light-emitting layer is arranged between the first electrode layer and the second patterned light-emitting layer.

6. The white light emitting device of claim 2, wherein the white light emitting device further comprises a third light emitting region, the first light emitting layer is further located in the third light emitting region, and the second light emitting layer is further located in the third light emitting region.

7. The white light emitting device of claim 6, wherein the first patterned light emitting layer is in the first light emitting region and not in the second light emitting region, and the second patterned light emitting layer is in the second light emitting region and not in the first light emitting region.

8. The white light emitting device of claim 7, wherein:

the first light-emitting unit comprises a first patterned light-emitting layer and a second patterned light-emitting layer, and the first patterned light-emitting layer and the second patterned light-emitting layer are arranged between the first electrode layer and the first light-emitting layer.

9. The white light emitting device of claim 2, wherein the first patterned light emitting layer is a red light emitting layer and the second patterned light emitting layer is a green light emitting layer.

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