TWM585985U - Organic light-emitting diode display device - Google Patents
Organic light-emitting diode display device Download PDFInfo
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- H—ELECTRICITY
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
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Abstract
Description
本新型是有關於一種有機發光二極體顯示裝置。 The present invention relates to an organic light emitting diode display device.
有機發光二極體(Organic Light-Emitting Diode，OLED)為採用發光性之有機化合物的發光元件，具有自發光特性，且其薄型化、顯示品質以及省電特性皆優於液晶顯示器(Liquid Crystal Display，LCD)。由於有機發光二極體具有廣視角、高反應速度、超薄等特性，使得有機發光二極體面板應用範圍愈來愈廣泛。 Organic Light-Emitting Diode (OLED) is a light-emitting element using a light-emitting organic compound. It has self-luminous characteristics, and its thickness, display quality and power saving characteristics are better than those of a liquid crystal display (Liquid Crystal Display). , LCD). Due to the wide viewing angle, high response speed, and ultra-thin characteristics of organic light emitting diodes, the application range of organic light emitting diode panels is becoming wider and wider.
有機發光二極體為藉由電子電洞於發光層中結合而發光。隨著有機發光二極體研究的進步，有人提出在發光層兩側各添加一層阻擋層，希望可以將電子電洞侷限在發光層，增加電子電洞在發光層中結合的機會，此方法確實可以有效的增加元件的發光效率，唯獨這樣的結構會導致多了兩層疊構，且增加材料以及機台的費用的問題。 Organic light-emitting diodes emit light by combining electron holes in a light-emitting layer. With the development of organic light-emitting diodes, some people have proposed adding a barrier layer on each side of the light-emitting layer, hoping to limit the electron hole to the light-emitting layer and increase the opportunity for the electron hole to combine in the light-emitting layer. This method does It can effectively increase the luminous efficiency of the device, but such a structure will lead to the problem of adding two more layers and increasing the cost of materials and equipment.
本新型之一技術態樣是在提供一種有機發光二極體顯示裝置，用以提升其發光效率並簡化製程。 One aspect of the new technology is to provide an organic light emitting diode display device for improving its light emitting efficiency and simplifying the manufacturing process.
根據本新型一實施方式，一種有機發光二極體顯示裝置包含基板、第一電極、第一有機層、共同發光層、第一發光層、第二發光層、第二有機層以及第二電極。第一電極設置於基板上。第一有機層設置於第一電極上。共同發光層設置於第一有機層上。第一發光層與第二發光層分別設置於共同發光層上，其中共同發光層與第一發光層發射相同的原色光，第一發光層與第二發光層發射不同的原色光，共同發光層作為第二發光層的電子阻擋層或電洞阻擋層，共同發光層的最高占據分子軌域(Highest Occupied Molecular Orbital，HOMO)的能階與第一發光層的最高占據分子軌域的能階之間具有第一能障，共同發光層的最低未占分子軌域(Lowest Unoccupied Molecular Orbital，LUMO)的能階與第一發光層的最低未占分子軌域的能階之間具有第二能障。第二有機層設置於第一發光層與第二發光層上。第二電極設置於第二有機層上。 According to an embodiment of the present invention, an organic light emitting diode display device includes a substrate, a first electrode, a first organic layer, a common light emitting layer, a first light emitting layer, a second light emitting layer, a second organic layer, and a second electrode. The first electrode is disposed on the substrate. The first organic layer is disposed on the first electrode. The common light emitting layer is disposed on the first organic layer. The first light-emitting layer and the second light-emitting layer are respectively disposed on a common light-emitting layer, wherein the common light-emitting layer and the first light-emitting layer emit light of the same primary color, and the first light-emitting layer and the second light-emitting layer emit different light of the primary color. As the electron blocking layer or hole blocking layer of the second light-emitting layer, the energy level of the highest light-occupying molecular orbital (HOMO) of the common light-emitting layer and the energy level of the highest light-emitting molecular orbital of the first light-emitting layer There is a first energy barrier between the energy levels of the lowest unoccupied molecular orbital (LUMO) of the common light-emitting layer and the energy level of the lowest unoccupied molecular orbital of the first light-emitting layer. . The second organic layer is disposed on the first light emitting layer and the second light emitting layer. The second electrode is disposed on the second organic layer.
於本新型之一或多個實施方式中，第一能障之絕對值大於或等於0.3eV。 In one or more embodiments of the present invention, the absolute value of the first energy barrier is greater than or equal to 0.3 eV.
於本新型之一或多個實施方式中，第二能障之絕對值大於或等於0.3eV。 In one or more embodiments of the present invention, the absolute value of the second energy barrier is greater than or equal to 0.3 eV.
於本新型之一或多個實施方式中，共同發光層的最低未占分子軌域的能階與第一有機層的最低未占分子軌域的能階之間的能階差之絕對值大於或等於0.3eV。 In one or more embodiments of the present invention, the absolute value of the energy level difference between the energy level of the lowest unoccupied molecular orbital region of the common light-emitting layer and the energy level of the lowest unoccupied molecular orbital region of the first organic layer is greater than Or equal to 0.3eV.
於本新型之一或多個實施方式中，第一發光層的最高占據分子軌域的能階與第二有機層的最高占據分子軌域的能階之間的能階差之絕對值大於或等於0.3eV。 In one or more embodiments of the present invention, the absolute value of the energy level difference between the energy level of the highest occupied molecular orbital domain of the first light-emitting layer and the energy level of the highest occupied molecular orbital domain of the second organic layer is greater than or It is equal to 0.3eV.
於本新型之一或多個實施方式中，共同發光層的最低未占分子軌域的能階與第二發光層的最低未占分子軌域的能階之間的能階差之絕對值大於或等於0.3eV。 In one or more embodiments of the present invention, the absolute value of the energy level difference between the energy level of the lowest unoccupied molecular orbital region of the common light-emitting layer and the energy level of the lowest unoccupied molecular orbital region of the second light-emitting layer is greater than Or equal to 0.3eV.
於本新型之一或多個實施方式中，第二發光層的最高占據分子軌域的能階與第二有機層的最高占據分子軌域的能階之間的能階差之絕對值大於或等於0.3eV。 In one or more embodiments of the present invention, the absolute value of the energy level difference between the energy level of the highest occupied molecular orbital region of the second light-emitting layer and the energy level of the highest occupied molecular orbital region of the second organic layer is greater than or It is equal to 0.3eV.
於本新型之一或多個實施方式中，共同發光層與第一發光層為藍色發光層，第二發光層為紅色發光層或綠色發光層。 In one or more embodiments of the present invention, the common light emitting layer and the first light emitting layer are blue light emitting layers, and the second light emitting layer is a red light emitting layer or a green light emitting layer.
於本新型之一或多個實施方式中，共同發光層與第一發光層的摻雜發光材料相同。 In one or more embodiments of the present invention, the common light emitting layer is the same as the doped light emitting material of the first light emitting layer.
於本新型之一或多個實施方式中，共同發光層作為第二發光層的電子傳輸層或電洞傳輸層。 In one or more embodiments of the present invention, the common light emitting layer is used as an electron transport layer or a hole transport layer of the second light emitting layer.
本新型上述實施方式藉由使共同發光層的最高占據分子軌域的能階與第一發光層的最高占據分子軌域的能階之間的能階差夠大而形成第一能障，於是自第一電極與第一有機層傳輸而進入共同發光層的電洞將會因為無法通過第一能障而被阻擋於共同發光層與第一發光層的介面之間；藉由使共同發光層的最低未占分子軌域的能階與第一發光層的最低未占分子軌域的能階之間的能階差夠大而形成第二能障，於是自第二電極、第二有機層傳輸而進入第一發 光層的電子將會因為無法通過第二能障而被阻擋於共同發光層與第一發光層的介面之間。於是，電子與電洞將會在共同發光層與第一發光層的介面結合，因而提升有機發光二極體顯示裝置的發光效率，同時因為不需額外製作電子阻擋層與電洞阻擋層，因而得以簡化製程。 The above-mentioned embodiments of the present invention form a first energy barrier by making the energy level difference between the energy level of the highest occupied molecular orbital region of the common light-emitting layer and the energy level of the highest occupied molecular orbital region of the first light-emitting layer sufficiently large. Holes that are transmitted from the first electrode and the first organic layer and enter the common light-emitting layer will be blocked between the interface of the common light-emitting layer and the first light-emitting layer because they cannot pass through the first energy barrier; The energy level difference between the lowest unoccupied molecular orbital level and the lowest unoccupied molecular orbital level of the first light-emitting layer is large enough to form a second energy barrier, so from the second electrode and the second organic layer Transmission into the first round The electrons of the light layer will be blocked between the interface of the common light emitting layer and the first light emitting layer because they cannot pass through the second energy barrier. As a result, the electrons and holes will be combined at the interface of the common light emitting layer and the first light emitting layer, thereby improving the light emitting efficiency of the organic light emitting diode display device. At the same time, since no additional electron blocking layer and hole blocking layer are required, To simplify the process.
100‧‧‧有機發光二極體顯示裝置 100‧‧‧organic light emitting diode display device
110‧‧‧基板 110‧‧‧ substrate
120‧‧‧第一電極 120‧‧‧first electrode
130‧‧‧第一有機層 130‧‧‧first organic layer
121、131、132、141、142、151、152、161、162、171、172、182‧‧‧能階 121, 131, 132, 141, 142, 151, 152, 161, 162, 171, 172, 182‧‧‧ energy level
140‧‧‧共同發光層 140‧‧‧common light emitting layer
150‧‧‧第一發光層 150‧‧‧first luminescent layer
160、160a、160b‧‧‧第二發光層 160, 160a, 160b‧‧‧Second light emitting layer
170‧‧‧第二有機層 170‧‧‧Second organic layer
180‧‧‧第二電極 180‧‧‧Second electrode
B1‧‧‧第一能障 B1‧‧‧First energy barrier
B2‧‧‧第二能障 B2‧‧‧Second Energy Disability
D1、D2、D3、D4‧‧‧能階差 D1, D2, D3, D4‧‧‧ Energy step
第1圖繪示依照本新型一實施方式的有機發光二極體顯示裝置的剖面示意圖。 FIG. 1 is a schematic cross-sectional view of an organic light emitting diode display device according to an embodiment of the present invention.
第2圖繪示第1圖的有機發光二極體顯示裝置的能階示意圖。 FIG. 2 is a schematic diagram showing an energy level of the organic light emitting diode display device of FIG. 1.
第3圖繪示第1圖的有機發光二極體顯示裝置的另一能階示意圖。 FIG. 3 illustrates another energy level diagram of the organic light emitting diode display device of FIG. 1.
以下將以圖式揭露本新型之複數個實施方式，為明確說明起見，許多實務上的細節將在以下敘述中一併說明。然而，應瞭解到，這些實務上的細節不應用以限制本新型。也就是說，在本新型部分實施方式中，這些實務上的細節是非必要的。此外，為簡化圖式起見，一些習知慣用的結構與元件在圖式中將以簡單示意的方式繪示之。 In the following, a plurality of embodiments of the present invention will be disclosed graphically. For the sake of clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be applied to limit the new model. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventional structures and components will be shown in the drawings in a simple and schematic manner.
第1圖繪示依照本新型一實施方式的有機發光二極體顯示裝置100的剖面示意圖。本新型不同實施方式提供一種有機發光二極體顯示裝置100。具體而言，有機發光二極體顯示裝置100可為傳統式有機發光二極體顯示裝置、倒置型有機發光二極體顯示裝置、穿透式有機發光二極體顯示裝置、上發光型有機發光二極體顯示裝置、下發光型有機發光二極體顯示裝置、串聯式有機發光二極體顯示裝置或可撓曲式有機發光二極體顯示裝置。 FIG. 1 is a schematic cross-sectional view of an organic light emitting diode display device 100 according to an embodiment of the present invention. Different embodiments of the present invention provide an organic light emitting diode display device 100. Specifically, the organic light emitting diode display device 100 may be a conventional organic light emitting diode display device, an inverted organic light emitting diode display device, a transmissive organic light emitting diode display device, or an upper light emitting organic light emitting device. Diode display devices, lower-light-emitting organic light-emitting diode display devices, tandem-type organic light-emitting diode display devices, or flexible organic light-emitting diode display devices.
如第1圖所繪示，一種有機發光二極體顯示裝置100包含基板110、第一電極120、第一有機層130、共同發光層140、第一發光層150、第二發光層160、第二有機層170以及第二電極180。第一電極120設置於基板110上。第一有機層130設置於第一電極120上。共同發光層140設置於第一有機層130上。第一發光層150與第二發光層160分別設置於共同發光層140上，其中共同發光層140與第一發光層150發射相同的原色光，第一發光層150與第二發光層160發射不同的原色光。第二有機層170設置於第一發光層150與第二發光層160上。第二電極180設置於第二有機層170上。具體而言，第一電極120可包含複數個電極分支120b，分別對應於第一發光層150與第二發光層160。 As shown in FIG. 1, an organic light emitting diode display device 100 includes a substrate 110, a first electrode 120, a first organic layer 130, a common light emitting layer 140, a first light emitting layer 150, a second light emitting layer 160, and a first light emitting diode. Two organic layers 170 and a second electrode 180. The first electrode 120 is disposed on the substrate 110. The first organic layer 130 is disposed on the first electrode 120. The common light emitting layer 140 is disposed on the first organic layer 130. The first light-emitting layer 150 and the second light-emitting layer 160 are respectively disposed on the common light-emitting layer 140. The common light-emitting layer 140 and the first light-emitting layer 150 emit the same primary color light, and the first light-emitting layer 150 and the second light-emitting layer 160 emit different light. Primary color light. The second organic layer 170 is disposed on the first light emitting layer 150 and the second light emitting layer 160. The second electrode 180 is disposed on the second organic layer 170. Specifically, the first electrode 120 may include a plurality of electrode branches 120b, corresponding to the first light emitting layer 150 and the second light emitting layer 160, respectively.
第2圖繪示第1圖的有機發光二極體顯示裝置100的能階示意圖。如第2圖所繪示，共同發光層140的最高占據分子軌域(Highest Occupied Molecular Orbital，HOMO)的能階141與第一發光層150的最高占據分子軌域的能階151之間具有第一能障B1，共同發光層140的最低未占分子軌域(Lowest Unoccupied Molecular Orbital，LUMO)的能階142與第一發光層150的最低未占分子軌域的能階152之間具有第二能障B2。 FIG. 2 is a schematic diagram showing an energy level of the organic light emitting diode display device 100 of FIG. 1. As shown in FIG. 2, the highest occupied molecular orbital region (Highest Occupied Molecular Orbital (HOMO) has a first energy barrier B1 between the energy level 141 of the first light-emitting layer 150 and the energy level 151 of the highest occupied molecular orbital region, and the lowest unoccupied molecular orbital of the common light-emitting layer 140. There is a second energy barrier B2 between the energy level 142 of the LUMO) and the energy level 152 of the lowest unoccupied molecular orbital region of the first light-emitting layer 150.
藉由使共同發光層140的最高占據分子軌域的能階141與第一發光層150的最高占據分子軌域的能階151之間的能階差夠大而形成第一能障B1，於是自第一電極120與第一有機層130傳輸而進入共同發光層140的電洞將會因為無法通過第一能障B1而被阻擋於共同發光層140與第一發光層150的介面之間；藉由使共同發光層140的最低未占分子軌域的能階142與第一發光層150的最低未占分子軌域的能階152之間的能階差夠大而形成第二能障B2，於是自第二電極180、第二有機層170傳輸而進入第一發光層150的電子將會因為無法通過第二能障B2而被阻擋於共同發光層140與第一發光層150的介面之間。於是，電子與電洞將會在共同發光層140與第一發光層150的介面結合，因而提升有機發光二極體顯示裝置100的發光效率，同時因為不需額外製作電子阻擋層與電洞阻擋層，因而得以簡化製程。 The first energy barrier B1 is formed by making the energy level difference between the energy level 141 of the highest occupied molecular orbital region of the common light-emitting layer 140 and the energy level 151 of the highest occupied molecular orbital region of the first light-emitting layer 150 sufficiently large. Holes transmitted from the first electrode 120 and the first organic layer 130 and entering the common light emitting layer 140 will be blocked between the interface of the common light emitting layer 140 and the first light emitting layer 150 because they cannot pass through the first energy barrier B1; The second energy barrier B2 is formed by making the energy level difference between the lowest unoccupied molecular orbital level 142 of the common light emitting layer 140 and the lowest unoccupied molecular orbital level 152 of the first light emitting layer 150 large enough. Therefore, electrons transmitted from the second electrode 180 and the second organic layer 170 and entering the first light-emitting layer 150 will be blocked at the interface between the common light-emitting layer 140 and the first light-emitting layer 150 because they cannot pass through the second energy barrier B2. between. As a result, electrons and holes will be combined at the interface of the common light emitting layer 140 and the first light emitting layer 150, thereby improving the light emitting efficiency of the organic light emitting diode display device 100. At the same time, no additional electron blocking layer and hole blocking are required. Layers, thereby simplifying the process.
具體而言，第一能障B1之絕對值大於或等於約0.3eV，第二能障B2之絕對值大於或等於約0.3eV。應了解到，以上所舉之第一能障B1與第二能障B2的具體實施方式僅為例示，並非用以限制本新型，本新型所屬技術 領域中具有通常知識者，應視實際需要，彈性選擇第一能障B1與第二能障B2的具體實施方式。 Specifically, the absolute value of the first energy barrier B1 is greater than or equal to about 0.3 eV, and the absolute value of the second energy barrier B2 is greater than or equal to about 0.3 eV. It should be understood that the specific implementations of the first energy barrier B1 and the second energy barrier B2 mentioned above are merely examples, and are not intended to limit the present invention. Those with ordinary knowledge in the field should flexibly select specific implementation modes of the first energy barrier B1 and the second energy barrier B2 according to actual needs.
進一步來說，因為有機發光二極體顯示裝置100包含發射相同原色光的共同發光層140與第一發光層150，由於這個多層結構的關係，所以電子電洞結合而形成激子後回到基態的發光區域範圍變大了，因此將可避免激子產生於發光層與傳輸層之間而損失的情況，於是得以提升發光效率。 Further, because the organic light emitting diode display device 100 includes a common light emitting layer 140 and a first light emitting layer 150 that emit light of the same primary color, due to this multilayer structure, the electron holes are combined to form excitons and return to the ground state. The range of the light-emitting area becomes larger, so that the exciton can be prevented from being lost between the light-emitting layer and the transmission layer, and the light-emitting efficiency can be improved.
如第1圖所繪示，共同發光層140與第一發光層150可為藍色發光層，第二發光層160可為紅色發光層或綠色發光層。更具體地說，第二發光層160a可為紅色發光層，第二發光層160b可為綠色發光層。 As shown in FIG. 1, the common light emitting layer 140 and the first light emitting layer 150 may be blue light emitting layers, and the second light emitting layer 160 may be a red light emitting layer or a green light emitting layer. More specifically, the second light emitting layer 160a may be a red light emitting layer, and the second light emitting layer 160b may be a green light emitting layer.
如第2圖所繪示，在共同發光層140與第一發光層150為藍色發光層時，由於共同發光層140與第一發光層150之間具有第一能障B1與第二能障B2，同時共同發光層140與第一發光層150為一多層結構，因此有機發光二極體顯示裝置100的藍色光發光效率將能有效提升，因而彌補現在業界在藍色材料開發上的不足。 As shown in FIG. 2, when the common light emitting layer 140 and the first light emitting layer 150 are blue light emitting layers, since the common light emitting layer 140 and the first light emitting layer 150 have the first energy barrier B1 and the second energy barrier B2. At the same time, the common light emitting layer 140 and the first light emitting layer 150 have a multilayer structure. Therefore, the blue light emission efficiency of the organic light emitting diode display device 100 can be effectively improved, thereby making up for the current deficiencies in the development of blue materials .
第3圖繪示第1圖的有機發光二極體顯示裝置100的另一能階示意圖。如第3圖所繪示，共同發光層140可作為第二發光層160的電子阻擋層與電洞傳輸層，或者共同發光層140可作為第二發光層160的電子傳輸層與電洞阻擋層。 FIG. 3 is another schematic diagram of the energy level of the organic light emitting diode display device 100 of FIG. 1. As shown in FIG. 3, the common light emitting layer 140 may serve as an electron blocking layer and a hole transporting layer of the second light emitting layer 160, or the common light emitting layer 140 may serve as an electron transporting layer and a hole blocking layer of the second light emitting layer 160. .
在本實施方式中，共同發光層140作為第二發光層160的電子阻擋層與電洞傳輸層，而藉由使共同發光層140的最低未占分子軌域的能階142與第二發光層160的最低未占分子軌域的能階162之間的能階差D1之絕對值大於或等於約0.3eV可以實現電子阻擋層的功能(即形成能障於能階142、162之間)。 In this embodiment, the common light-emitting layer 140 serves as an electron blocking layer and a hole transport layer of the second light-emitting layer 160, and the energy level 142 and the second light-emitting layer of the lowest unoccupied molecular orbital region of the common light-emitting layer 140 are used. The absolute value of the energy level difference D1 between the energy level 162 of the lowest unoccupied molecular orbital region of 160 is greater than or equal to about 0.3 eV, and the function of the electron blocking layer can be realized (that is, the energy barrier is formed between the energy levels 142 and 162).
具體而言，電洞將自第一電極120傳輸而通過第一有機層130與共同發光層140進而進入第二發光層160，而自第二電極180、第二有機層170傳輸而進入第二發光層160的電子將會因為無法通過共同發光層140而被阻擋於第二發光層160，於是電子與電洞將會在第二發光層160結合而發光。因為共同發光層140作為電子阻擋層與電洞傳輸層，因此將不需額外製作電子阻擋層與電洞傳輸層，因而得以簡化製程。 Specifically, the holes will be transmitted from the first electrode 120 and then enter the second light-emitting layer 160 through the first organic layer 130 and the common light-emitting layer 140, and transmitted from the second electrode 180 and the second organic layer 170 and enter the second The electrons of the light-emitting layer 160 will be blocked by the second light-emitting layer 160 because they cannot pass through the common light-emitting layer 140, so the electrons and holes will be combined in the second light-emitting layer 160 to emit light. Because the common light-emitting layer 140 serves as an electron blocking layer and a hole transporting layer, there is no need to additionally fabricate an electron blocking layer and a hole transporting layer, thereby simplifying the manufacturing process.
如第2圖所繪示，第一有機層130可作為共同發光層140的電子阻擋層或電洞阻擋層。在本實施方式中，第一有機層130作為共同發光層140的電子阻擋層，而這可以藉由使共同發光層140的最低未占分子軌域的能階142與第一有機層130的最低未占分子軌域的能階132之間的能階差D2之絕對值大於或等於約0.3eV來實現(即形成能障於能階132、142之間)。 As shown in FIG. 2, the first organic layer 130 can serve as an electron blocking layer or a hole blocking layer of the common light emitting layer 140. In this embodiment, the first organic layer 130 serves as an electron blocking layer of the common light-emitting layer 140, and this can be achieved by making the lowest non-occupied molecular orbital energy level 142 of the common light-emitting layer 140 and the lowest of the first organic layer 130 The absolute value of the energy level difference D2 between the energy levels 132 not occupying the molecular orbital region is greater than or equal to about 0.3 eV to achieve (ie, the energy barrier is formed between the energy levels 132 and 142).
於是，自第二電極180傳輸而通過第二有機層170、第一發光層150進而進入共同發光層140的電子將會因 為無法通過第一有機層130而被阻擋於共同發光層140，電子與電洞將會在共同發光層140結合，進而提升發光效率。 Therefore, electrons transmitted from the second electrode 180 through the second organic layer 170, the first light emitting layer 150, and then into the common light emitting layer 140 will be caused by In order to be blocked by the common light emitting layer 140 through the first organic layer 130, electrons and holes will be combined in the common light emitting layer 140, thereby improving light emitting efficiency.
具體而言，第二有機層170可作為第一發光層150的電子阻擋層或電洞阻擋層。在本實施方式中，第二有機層170作為第一發光層150的電洞阻擋層，而這可以藉由使第一發光層150的最高占據分子軌域的能階151與第二有機層170的最高占據分子軌域的能階171之間的能階差D3之絕對值大於或等於約0.3eV來實現(即形成能障於能階151、171之間)。 Specifically, the second organic layer 170 may serve as an electron blocking layer or a hole blocking layer of the first light emitting layer 150. In this embodiment, the second organic layer 170 serves as a hole blocking layer for the first light-emitting layer 150, and this can be achieved by making the energy level 151 of the highest light-emitting layer 150 occupying the molecular orbital region and the second organic layer 170 The absolute value of the energy level difference D3 between the energy levels 171 occupying the highest molecular orbital range is greater than or equal to about 0.3 eV (that is, the energy barrier is formed between the energy levels 151 and 171).
於是，自第一電極120傳輸而通過第一有機層130、共同發光層140進而進入第一發光層150的電洞將會因為無法通過第二有機層170而被阻擋於第一發光層150，電子與電洞將會在第一發光層150結合，進而提升發光效率。 Therefore, the holes transmitted from the first electrode 120 through the first organic layer 130, the common light emitting layer 140, and then into the first light emitting layer 150 will be blocked by the first light emitting layer 150 because they cannot pass through the second organic layer 170. The electrons and holes will be combined in the first light emitting layer 150, thereby improving the light emitting efficiency.
具體而言，共同發光層140與第一發光層150的摻雜發光材料相同。於是，無論電子電洞結合而形成激子的位置在共同發光層140或第一發光層150，共同發光層140或第一發光層150皆會發射相同顏色之光線，也就不會有色偏差的問題。 Specifically, the common light emitting layer 140 is the same as the doped light emitting material of the first light emitting layer 150. Therefore, no matter the position of the exciton formed by the combination of the electron holes is in the common light emitting layer 140 or the first light emitting layer 150, the common light emitting layer 140 or the first light emitting layer 150 will emit light of the same color, and there will be no color deviation. problem.
如第3圖所繪示，第二有機層170可作為第二發光層160的電子阻擋層或電洞阻擋層。在本實施方式中，第二有機層170作為第二發光層160的電洞阻擋層，而這可以藉由使第二發光層160的最高占據分子軌域的能階161與第二有機層170的最高占據分子軌域的能階171之間的能階差D4之絕對值大於或等於約0.3eV來實現(即 形成能障於能階161、171之間)。於是，自第一電極120傳輸而通過第一有機層130、共同發光層140進而進入第二發光層160的電洞將會因為無法通過第二有機層170而被阻擋於第二發光層160，於是電子與電洞將會在第二發光層160結合而發光，並且得以有效提升發光效率。 As shown in FIG. 3, the second organic layer 170 can be used as an electron blocking layer or a hole blocking layer of the second light emitting layer 160. In this embodiment, the second organic layer 170 is used as a hole blocking layer of the second light-emitting layer 160, and this can be achieved by making the energy level 161 of the second light-emitting layer 160 occupying the highest molecular orbital region and the second organic layer 170 The absolute value of the energy level difference D4 between the energy levels 171 occupying the highest molecular orbital range is greater than or equal to about 0.3eV (i.e. Form energy barriers between energy levels 161, 171). Therefore, the holes transmitted from the first electrode 120 through the first organic layer 130, the common light emitting layer 140, and then into the second light emitting layer 160 will be blocked by the second light emitting layer 160 because they cannot pass through the second organic layer 170. Therefore, the electrons and holes will be combined to emit light in the second light-emitting layer 160, and the light-emitting efficiency can be effectively improved.
具體而言，基板110可作為上基板或下基板，第一電極120可作為上電極或下電極，第二電極180可作為上電極或下電極。更具體地說，在第二電極180作為下電極時，第二電極180可包含複數個電極分支，分別對應於第一發光層150與第二發光層160。應了解到，以上所舉之基板110、第一電極120與第二電極180的具體實施方式僅為例示，並非用以限制本新型，本新型所屬技術領域中具有通常知識者，應視實際需要，彈性選擇基板110、第一電極120與第二電極180的具體實施方式。 Specifically, the substrate 110 may serve as an upper substrate or a lower substrate, the first electrode 120 may serve as an upper electrode or a lower electrode, and the second electrode 180 may serve as an upper electrode or a lower electrode. More specifically, when the second electrode 180 is used as the lower electrode, the second electrode 180 may include a plurality of electrode branches corresponding to the first light emitting layer 150 and the second light emitting layer 160, respectively. It should be understood that the above-mentioned specific implementations of the substrate 110, the first electrode 120, and the second electrode 180 are merely examples, and are not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs should consider actual needs. A specific embodiment of the elastic selection substrate 110, the first electrode 120 and the second electrode 180.
在本實施方式中，第一電極120的最高占據分子軌域的能階121可大於第一有機層130的最高占據分子軌域的能階131。第一有機層130的最高占據分子軌域的能階131可大於共同發光層140的最高占據分子軌域的能階141。共同發光層140的最高占據分子軌域的能階141可大於第一發光層150的最高占據分子軌域的能階151。第一發光層150的最高占據分子軌域的能階151可大於第二有機層170的最高占據分子軌域的能階171。第一有機層130的最低未占分子軌域的能階132可大於共同發光層140的最低未占分子軌域的能階142。共同發光層140的最 低未占分子軌域的能階142可大於第一發光層150的最低未占分子軌域的能階152。第一發光層150的最低未占分子軌域的能階152可大於第二有機層170的最低未占分子軌域的能階172。第二有機層170的最低未占分子軌域的能階172可大於第二電極180的最低未占分子軌域的能階182。共同發光層140的最高占據分子軌域的能階141可大於第二發光層160的最高占據分子軌域的能階161。第二發光層160的最高占據分子軌域的能階161可大於第二有機層170的最高占據分子軌域的能階171。共同發光層140的最低未占分子軌域的能階142可大於第二發光層160的最低未占分子軌域的能階162。第二發光層160的最低未占分子軌域的能階162可大於第二有機層170的最低未占分子軌域的能階172。 In this embodiment, the energy level 121 of the highest occupied molecular orbital region of the first electrode 120 may be greater than the energy level 131 of the highest occupied molecular orbital region of the first organic layer 130. The energy level 131 of the highest occupied molecular orbital region of the first organic layer 130 may be greater than the energy level 141 of the highest occupied molecular orbital region of the common light emitting layer 140. The energy level 141 of the highest occupied molecular orbital region of the common light emitting layer 140 may be greater than the energy level 151 of the highest occupied molecular orbital region of the first light emitting layer 150. The energy level 151 of the highest occupied molecular orbital region of the first light emitting layer 150 may be greater than the energy level 171 of the highest occupied molecular orbital region of the second organic layer 170. The energy level 132 of the lowest unoccupied molecular orbital region of the first organic layer 130 may be greater than the energy level 142 of the lowest unoccupied molecular orbital region of the common light emitting layer 140. The most common light emitting layer 140 The energy level 142 of the low unoccupied molecular orbital region may be greater than the energy level 152 of the lowest unoccupied molecular orbital region of the first light emitting layer 150. The energy level 152 of the lowest unoccupied molecular orbital region of the first light emitting layer 150 may be greater than the energy level 172 of the lowest unoccupied molecular orbital region of the second organic layer 170. The energy level 172 of the lowest unoccupied molecular orbital region of the second organic layer 170 may be greater than the energy level 182 of the lowest unoccupied molecular orbital region of the second electrode 180. The energy level 141 of the highest occupied molecular orbital region of the common light emitting layer 140 may be greater than the energy level 161 of the highest occupied molecular orbital region of the second light emitting layer 160. The energy level 161 of the highest occupied molecular orbital region of the second light emitting layer 160 may be greater than the energy level 171 of the highest occupied molecular orbital region of the second organic layer 170. The energy level 142 of the lowest unoccupied molecular orbital region of the common light emitting layer 140 may be greater than the energy level 162 of the lowest unoccupied molecular orbital region of the second light emitting layer 160. The energy level 162 of the lowest unoccupied molecular orbital region of the second light emitting layer 160 may be greater than the energy level 172 of the lowest unoccupied molecular orbital region of the second organic layer 170.
本新型上述實施方式藉由使共同發光層140的最高占據分子軌域的能階141與第一發光層150的最高占據分子軌域的能階151之間的能階差夠大而形成第一能障B1，於是自第一電極120與第一有機層130傳輸而進入共同發光層140的電洞將會因為無法通過第一能障B1而被阻擋於共同發光層140與第一發光層150的介面之間；藉由使共同發光層140的最低未占分子軌域的能階142與第一發光層150的最低未占分子軌域的能階152之間的能階差夠大而形成第二能障B2，於是自第二電極180、第二有機層170傳輸而進入第一發光層150的電子將會因為無法通過第二能障B2而被阻擋於共同發光層140與第一發光層150的介面之 間。於是，電子與電洞將會在共同發光層140與第一發光層150的介面結合，因而提升有機發光二極體顯示裝置100的發光效率，同時因為不需額外製作電子阻擋層與電洞阻擋層，因而得以簡化製程。 The above-mentioned embodiment of the present invention forms the first step by making the energy level difference between the energy level 141 of the highest occupied molecular orbital region of the common light emitting layer 140 and the energy level 151 of the highest occupied molecular orbital region of the first light emitting layer 150 sufficiently large. Energy barrier B1, and thus holes that have entered the common light emitting layer 140 transmitted from the first electrode 120 and the first organic layer 130 will be blocked by the common light emitting layer 140 and the first light emitting layer 150 because they cannot pass through the first energy barrier B1. Formed by making the energy level difference between the lowest unoccupied molecular orbital level 142 of the common light-emitting layer 140 and the lowest unoccupied molecular orbital level 152 of the first light-emitting layer 150 sufficiently large. The second energy barrier B2, so the electrons transmitted from the second electrode 180 and the second organic layer 170 and entering the first light emitting layer 150 will be blocked by the common light emitting layer 140 and the first light emission because they cannot pass through the second energy barrier B2. Interface of layer 150 between. As a result, electrons and holes will be combined at the interface of the common light emitting layer 140 and the first light emitting layer 150, thereby improving the light emitting efficiency of the organic light emitting diode display device 100. At the same time, no additional electron blocking layer and hole blocking are required. Layers, thereby simplifying the process.
雖然本新型已以實施方式揭露如上，然其並非用以限定本新型，任何熟習此技藝者，在不脫離本新型之精神和範圍內，當可作各種之更動與潤飾，因此本新型之保護範圍當視後附之申請專利範圍所界定者為準。 Although the new model has been disclosed as above, it is not intended to limit the new model. Any person skilled in the art can make various changes and retouches without departing from the spirit and scope of the new model. Therefore, the new model is protected. The scope shall be determined by the scope of the attached patent application.
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