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Organic electroluminescent device

An electroluminescence device and a luminescence technology, which are applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve problems such as low luminous efficiency, environmental pollution, and short service life

Active Publication Date: 2013-06-12
GUAN YEOLIGHT TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fluorescent lamps also have a series of defects, such as low luminous efficiency, short service life, a large amount of ultraviolet radiation in the light, and a large amount of heavy metals such as mercury and lead, which cause environmental pollution.

Method used

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  • Organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0039] Embodiment 1 provides a white OLED device with three luminescent centers. The three light-emitting layers are red, blue, and green light-emitting layers, and the red phosphorescent light-emitting layer is made of hole-transporting host material NPB, doped with red dye Ir(piq) 3 ; The blue fluorescent layer adopts Bepp 2 ; The main body of the green phosphorescent layer adopts the same material Bepp as the blue fluorescent layer 2 , doped green dye Ir(ppy) 3 . The device structure of this embodiment is as follows:

[0040] ITO / NPB / NPB: Ir(piq) 3 / Bepp 2 / Bepp 2 : Ir(ppy) 3 / Bepp 2 / LiF / Al (1)

[0041] The specific preparation method for preparing an OLED device with the above structure (1) is as follows:

[0042] ① Clean the glass substrate 01 by using boiling detergent ultrasound and deionized water ultrasound, and place it under an infrared lamp for drying. Evaporate a layer of ITO on the glass as the anode 02, with a film thickness of 180nm;

[0043] ②Plac...

Embodiment 8-14

[0073] Compared with Examples 1-7, Examples 8-14 add a hole injection layer, and the hole transport material, the host material of the red phosphorescent layer and the phosphorescent dye are also different.

[0074] The device structure of embodiment 8-11:

[0075] ITO / HIL: HD / TAPC / TCTA: Ir(mdq) 2 (acac) / Bepp 2 / Bepp 2 : Ir(ppy) 3 / Bepp 2 / LiF / Al (3)

[0076] The device structure of embodiment 12-14 is respectively:

[0077] ITO / HIL: HD / TAPC / TAPC: Ir(mdq) 2 (acac) / Bepp 2 / Bepp 2 : Ir(ppy) 3 / Bepp 2 / LiF / Al (4)

[0078] ITO / HIL: HD / TAPC / TPD: Ir(mdq) 2 (acac) / Bepp 2 / Bepp 2 : Ir(ppy) 3 / Bepp 2 / LiF / Al (5)

[0079] ITO / HIL: HD / TAPC / NPB: Ir(mdq) 2 (acac) / Bepp 2 / Bepp 2 : Ir(ppy) 3 / Bepp 2 / LiF / Al (6)

[0080] The device structure of comparative examples 3-4:

[0081] ITO / HIL: HD / TAPC / TCTA: Ir(mdq) 2 (acac) / TCTA / Bepp 2 : BD / Bepp 2 / Bepp 2 : Ir(ppy) 3 / Bepp 2 / LiF / Al (7)

[0082] table 3

[0083]

Embodiment 15-20

[0085] Examples 15-20 have adopted different materials for the blue light-emitting layer and the electron transport layer, and the device structure is as follows:

[0086] ITO / HIL: HD / TAPC / TCTA: Ir(mdq) 2 (acac) / Blu-ray layer / Bepp 2 : Ir(ppy) 3 / Electron transport layer / LiF / Al (8)

[0087] Table 4

[0088]

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Abstract

The invention relates to an organic electroluminescent device. In order to obtain the organic electroluminescent device with high efficiency and good color purity, an organic functional layer of the device comprises a blue luminescent layer and a phosphorescence luminescent layer, wherein the phosphorescence luminescent layer can be monolayer or multilayer; and in the blue luminescent layer, a blue light material with the high triplet-state energy level is adopted, and the blue light material can be used as a main material of a phosphorescence layer simultaneously, so that singlet-state excitons and triplet-state excitons of the blue light material can be utilized effectively. Therefore the efficiency of the device is improved, the material is saved and a process is simplified simultaneously.

Description

technical field [0001] The invention relates to an organic electroluminescent device, in particular to a structure of an organic electroluminescent device. Background technique [0002] Incandescent lamps and fluorescent lamps are two commonly used light sources at present, but their energy utilization efficiency is not high. The efficiency of an incandescent lamp is only 13-20lm / W, which converts most of the electric energy into heat energy, causing a lot of energy waste. Fluorescent lamps play an important role in human life and production, and their efficiency is about 90lm / W. However, fluorescent lamps also have a series of defects, such as low luminous efficiency, short service life, a large amount of ultraviolet radiation in the light, and heavy metals such as mercury and lead, which cause environmental pollution. Therefore, people need a new light source with high efficiency, energy saving and environmental protection. [0003] An organic electroluminescent device ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54
Inventor 邱勇段炼李艳蕊
Owner GUAN YEOLIGHT TECH CO LTD