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Organic light-emitting device

A technology of organic light-emitting elements and light-emitting layers, applied in the directions of light-emitting materials, electrical components, electroluminescent light sources, etc., can solve the problems of additional high voltage, large energy difference, and inability to emit light well, and achieve the effect of reducing power consumption

Inactive Publication Date: 2009-05-06
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in this device configuration, there is an electron injection barrier with a large energy difference of about 1 eV between the electron affinity of the electron acceptor layer and the electron transport layer, and it is necessary to apply a high voltage.
For this reason, even if a negative bias is applied to the cathode of the element, it cannot emit light well

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0138] On a glass substrate with a thickness of 0.7 mm, ITO was formed into a film with a film thickness of 130 nm by sputtering. The substrate was subjected to ultrasonic cleaning for 5 minutes in isopropanol, followed by UV ozone cleaning for 30 minutes, and then the substrate with the ITO electrode was mounted on a substrate holder of a vacuum evaporation device.

[0139] In addition, TPD232 as a material for the hole injection layer, TBDB as a material for the hole transport layer, BH as a host material for the light-emitting layer, BD as a blue light-emitting material, and Alq as electron transport material, Li as electron donor, (CN) as electron acceptor 2 TCNQ, Al as cathode material.

[0140] First, a TPD 232 film functioning as a hole injection layer was formed to have a film thickness of 60 nm. After the formation of the hole injection layer, a TBDB film functioning as a hole transport layer is then formed with a film thickness of 20 nm, and then, as a light emitt...

Embodiment 2

[0143] In Example 1, Liq is used instead of Li as the electron donor to make the electron donor layer (light transmittance: 90%, specific resistance: 10 14 Ω·cm) was formed into a film, and an organic light-emitting device was obtained in the same manner as in Example 1.

[0144] The obtained organic light-emitting device was evaluated. The results are shown in Table 1.

Embodiment 3

[0146] In Example 1, after forming the electron acceptor layer, MoO x (x = 2 to 3) An organic light-emitting element was obtained in the same manner as in Example 2 except that a buffer layer having a film thickness of 10 nm was formed as a material for the buffer layer, and then an Al film (cathode) was formed.

[0147] The obtained organic light-emitting device was evaluated. The results are shown in Table 1.

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Abstract

Disclosed is an organic light-emitting device (1) wherein an anode (10), a light-emitting layer (40), a donor-containing layer (50), an acceptor-containing layer (60) and a cathode (70) are formed in this order. This organic light-emitting device (1) is characterized in that the donor-containing layer (50) contains at least one substance selected from the group consisting of donor metals, donor metal compounds and donor metal complexes.

Description

technical field [0001] The present invention relates to an organic light-emitting element, in particular to an organic EL element. Background technique [0002] EL elements using electroluminescence are self-illuminating, have high visibility, and are completely solid elements, so they have excellent impact resistance and other advantages, and their application as light-emitting elements in various display devices has attracted attention. [0003] The EL elements include inorganic EL elements using inorganic compounds as light-emitting materials, and organic EL elements using organic compounds. Among them, organic EL elements can easily perform full color on the basis of greatly reducing the applied voltage, and consume less energy. The power is small, and surface emission can be performed, so it is regarded as a next-generation light-emitting element, and the development of this element is also in progress. [0004] The basic structure of the organic EL element is anode / li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50C09K11/06
CPCH01L51/5052H05B33/14H10K50/155H10K50/165H05B33/20H10K50/00
Inventor 福冈贤一细川地潮森下浩延熊均
Owner IDEMITSU KOSAN CO LTD