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Organic electroluminescence device

An electroluminescent element and a luminescent technology, applied in the direction of electrical components, luminescent materials, electric solid devices, etc., can solve the problem that there is no record of the optimal relationship between the luminescent layer and the electron transport layer, and achieve the effect of less energy loss

Inactive Publication Date: 2009-08-05
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no description on the preferred relationship between the mobility of the light-emitting layer and the electron-transporting layer.

Method used

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  • Organic electroluminescence device
  • Organic electroluminescence device
  • Organic electroluminescence device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0286] (Manufacturing of organic EL elements)

[0287] A 25 mm x 75 mm x 1.1 mm thick glass substrate with an ITO transparent electrode (manufactured by Geomatics Co., Ltd.) was ultrasonically cleaned in isopropanol for 5 minutes, and then UV ozone cleaning was performed for 30 minutes. The cleaned glass substrate with transparent electrode lines was installed on the substrate holder of the vacuum evaporation device. First, TCTA with a film thickness of 95 nm was formed on the side where the transparent electrode lines were formed to cover the transparent electrodes. This TCTA film functions as a hole transport layer. In addition, after the hole transport layer was formed, the host A and the complex A were co-evaporated to form a film with a film thickness of 30 nm by resistance heating on the film. The concentration of complex A was 7.5% by weight. This host A:complex A film functions as a light-emitting layer. After forming the light-emitting layer, the electron transport...

Embodiment 2

[0291] An organic EL element was fabricated and evaluated in the same manner as in Example 1 except that Material B was used as the host material. The results are shown in Table 3.

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Abstract

An organic electroluminescent device, including: a cathode; an anode; and organic layers including at least an emitting layer and an electron-transporting layer between the cathode and the anode, the electron-transporting material with the slowest electron mobility constituting the electron-transporting layer having an electron mobility of 2.010 -5 cm 2 / Vs or more in an electric field intensity of 0.4 to 0.5 MV / cm, the electron mobility / hole mobility (Delta EM) of a host material constituting the emitting layer, and the electron mobility / hole mobility (Delta ET) of the electron-transporting material with the slowest electron mobility constituting the electron-transporting layer satisfying the following relationship: Delta ET > 1, 0.3 Delta EM.

Description

technical field [0001] The present invention relates to an organic electroluminescence (EL) element excellent in light emission characteristics and lifetime. Background technique [0002] Since high-efficiency light emission is realized in organic EL elements, a multilayer structure of more than three layers with the functions of separating hole transport, light emission, and electron transport has become the mainstream in organic EL elements, and the light-emitting layer is used in solid media ( A substance in which a fluorescent dye (guest) with a high quantum yield such as a laser dye is dispersed in a host) material. In this structure, the fluorescence quantum yield of the light-emitting layer can be improved, not only the quantum efficiency of the organic EL element is greatly improved, but also the emission wavelength can be freely controlled by selecting the fluorescent pigment used. [0003] In addition, another advantage of the element of the multilayer structure i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50C09K11/06
CPCH01L51/5012H01L51/0067H01L51/0061H01L51/0071H01L51/0085H01L51/008H01L51/0072H01L51/0058H01L51/0051H01L51/5048H10K85/611H10K85/636H10K85/626H10K85/654H10K85/6572H10K85/657H10K85/342H10K50/14H10K50/11H10K85/658H10K50/12H10K85/322
Inventor 岩隈俊裕荒金崇士新井宏昌长岛英明
Owner IDEMITSU KOSAN CO LTD