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Organic electroluminescent element

An electroluminescent element and electroluminescent technology, which are applied in electroluminescent light sources, electrical components, organic semiconductor devices, etc., can solve the problems of shortening the life of organic electroluminescent elements, suppress the changes in brightness and chromaticity, improve Conversion efficiency, the effect of good luminous balance

Inactive Publication Date: 2012-09-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a blue fluorescent material layer tends to show a change in chromaticity; since the lifetime of the organic electroluminescent element depends on the amount of change in chromaticity, the lifetime of the organic electroluminescent element is shortened, which is problematic

Method used

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  • Organic electroluminescent element
  • Organic electroluminescent element
  • Organic electroluminescent element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 5

[0105] The device structure (layer configuration) and the film thickness of each layer are given below. The layer structure among the embodiment 1 to 5 and figure 1 The layer structure is the same. However, the intermediate layer 3 includes two layers, namely a first layer and a second layer.

[0106] Substrate 5: Glass substrate (0.7mm)

[0107] Anode 4b: ITO (150nm)

[0108] Hole injection layer 31: CuPc (30nm)

[0109] Hole transport layer 32: TPD (30nm)

[0110] Blue fluorescent light-emitting layer 22: TBADN:TBP:NPD (Xnm)

[0111] Green fluorescent light-emitting layer 21: Alq 3 :C545T(Ynm)

[0112] Electron transport layer 33: BCP (30nm)

[0113] Intermediate layer 3 (first layer): BCP:Li (10nm)

[0114] Intermediate layer 3 (second layer): ITO (10nm)

[0115] Hole transport layer 34: TPD (30nm)

[0116] Red phosphorescent emitting layer 12: CBP:Btp 2 Ir(acac)(αnm)

[0117] Green phosphorescence emitting layer 11: CBP:Ir(pp) 3 (βnm)

[0118] Electron trans...

Embodiment 6 to 10

[0146] The organic electroluminescent elements in Examples 6 to 10 were prepared in the same manner as in Examples 1 to 5, but here, the green fluorescent light emission of fluorescent unit 2 in the organic electroluminescent elements of Examples 1 to 5 Layer 21 is as follows.

[0147] Green fluorescent light-emitting layer 21: Alq 3 : rubrene (Y nm)

[0148] In the green fluorescent light-emitting layer 21, the main body of the light-emitting layer: Alq 3 Doped with 2% green emitting dopant: rubrene. The green fluorescent light-emitting layer 21 uses rubrene that causes visible yellow light emission, and is therefore also called a yellow fluorescent light-emitting layer. The film thickness is shown in Table 1.

Embodiment 11 to 15

[0150] The organic electroluminescent elements in Examples 11 to 15 were prepared in the same manner as in Examples 1 to 5, but here, the green fluorescent light emission of fluorescent unit 2 in the organic electroluminescent elements of Examples 1 to 5 Layer 21 is as follows.

[0151] Green fluorescent light-emitting layer 21: Alq3: coumarin 6 (Ynm)

[0152] In the green fluorescent light-emitting layer 21, the main body of the light-emitting layer: Alq 3 Doped with 2% green-emitting dopant: coumarin 6 (λ max = 510nm). The film thickness is shown in Table 1.

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Abstract

Disclosed is a white light emitting organic electroluminescent element having high efficiency and a long life. The organic electroluminescent element is provided with a red phosphorescent light emitting layer (12), a green phosphorescent light emitting layer (11), a blue fluorescent light emitting layer (22) and a green fluorescent light emitting layer (21). A phosphorescent light unit (1) is composed of the red phosphorescent light emitting layer (12) and the green phosphorescent light emitting layer (11). A fluorescent light unit (2) is composed of the blue fluorescent light emitting layer (22) and the green fluorescent light emitting layer (21). The phosphorescent light unit (1) and the fluorescent light unit (2) are connected through an intermediate layer (3). Preferably, the phosphorescent light unit (1) is disposed closer to the cathode side than the fluorescent light unit (2). Preferably, the emission colour is one selected from the ranges 3900-4500K, 3200-3700K, and 2600-3150K.

Description

technical field [0001] The present invention relates to an organic electroluminescent element, and more particularly to an organic electroluminescent element suitable for white light emission. Background technique [0002] Known organic electroluminescent elements are formed by stacking organic material layers in a single layer or multiple layers between one electrode and another electrode. In such an organic electroluminescence element, one of the electrodes is an anode and the other is a cathode, and a voltage applied across the two electrodes causes the electrons injected and transported from the cathode side to be different from those injected and transported from the anode side into the organic material layer. Recombination of transported holes. As a result of this recombination, luminescence is obtained. The organic electroluminescence element is a thin light emitting device that provides surface light emission, and has attracted attention in recent years as a light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/12H01L51/50
CPCH05B33/10H05B33/14H10K50/13H10K50/19H10K2101/27
Inventor 佐佐木博之
Owner PANASONIC CORP