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Biscarbazole derivative host materials and red emitter for OLED emissive region

A technology of host material and emission layer, which is applied in OLED materials, organic light-emitting devices and energy fields. It can solve the problems of unoptimized phosphorescent device light-emitting layer and the failure to disclose the effectiveness of OLEDs, etc., and achieve high luminous efficiency, improved life, and low voltage requirements. Effect

Inactive Publication Date: 2015-02-18
UNIVERSAL DISPLAY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effectiveness of OLEDs fabricated by combining this material with phosphorescent materials is not disclosed, and the application discloses perylene and pyrene rings as fused polycyclic aromatic rings, which are known to have small triplet energy levels , and they are not preferred for use as light-emitting layers of phosphorescent devices, and no effective materials for phosphorescent devices are selected

Method used

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  • Biscarbazole derivative host materials and red emitter for OLED emissive region
  • Biscarbazole derivative host materials and red emitter for OLED emissive region
  • Biscarbazole derivative host materials and red emitter for OLED emissive region

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Embodiment 2 and comparative Embodiment 1 to 4

[0448] In Example 2 and Comparative Examples 1 to 4, organic EL devices were formed in the same manner as in Example 1 except that the materials used in Example 1 were replaced as summarized in Table 4. These organic EL devices were evaluated in the same manner as in Example 1. The results are shown in Table 4.

[0449] Table 4

[0450]

[0451] Table 4 shows that Device Example 1 and Device Example 2, whose emissive layers comprise a novel combination of an emitter host material according to the present disclosure and a red phosphorescent dopant material, exhibit significantly longer luminescence half-lives (LT 50 ) and higher EQE and luminous efficiency (L / J) while being able to have a lower driving voltage, compared to comparative example devices 1 to 4.

[0452] For example, a red PHOLED (device example 1) using the H1 host compound and the red phosphorescent dopant material D8 exhibited an EQE of 16.1%, and at 10 mA / cm 2 Under the driving voltage of 7.45V, and at 20...

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Abstract

The organic electroluminescence device utilizes a novel combination of a biscarbazole derivative compound as a phospherescent host materials and an orgaphosphorescent material as a red phosphorescent dopant material in the light emitting region of the device, where the biscarbazole derivative compound is represented by a formula (1); wherein the red phosphorescent dopant material is a phosphorescent organometallic complex having a substituted chemical structure represented by one of the partial chemical structures represented by a formulas (D1), (D2) and (D3).

Description

Background of the invention [0001] The present invention relates to organic electroluminescent (EL) devices such as organic light emitting devices (hereinafter simply referred to as OLEDs) and materials that can be used in such OLEDs. In particular, it relates to OLEDs comprising a red-emitting emitting layer, and OLED materials for such OLEDs. Background technique [0002] OLEDs comprising organic thin film layers including a light emitting layer positioned between an anode and a cathode are known in the art. In such devices, the emission of light can be derived from the energy of excitons generated by the recombination of electrons with holes injected into the light-emitting layer. [0003] Typically, OLEDs comprise several organic layers, where at least one of these layers can be made to electroluminescent by applying a voltage across the device. When a voltage is applied across the device, the cathode effectively reduces the adjacent organic layer (ie injects electrons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06H01L51/54H01L51/50
CPCH01L51/0085H01L51/0072C09K2211/1007C09K2211/1029H01L51/009H01L51/0092C09K2211/1044C09K11/06C09K2211/185H01L51/5016H10K85/6572H10K85/342H10K85/361H10K85/381H10K50/11H10K2101/10
Inventor 山本整M·S·维弗尔J·J·布朗西村和树岩隈俊裕
Owner UNIVERSAL DISPLAY