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Light-emitting element and light-emitting device

A technology of light-emitting elements and light-emitting layers, which is applied in the direction of electroluminescent light sources, lighting devices, electrical components, etc., and can solve problems such as service life problems

Active Publication Date: 2007-05-02
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, according to the report of Non-Patent Document 3, when the initial luminescence is controlled at 500cd / m 2 When driven by constant current, the half-life of light emission is about 170 hours, so there is a problem of service life in light-emitting elements using triplet light-emitting materials.

Method used

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Examples

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Embodiment approach

[0275] Hereinafter, the present invention will be described in detail based on embodiments. However, naturally the present invention is not limited to these embodiments. First, synthesis examples of organometallic complexes used in the light-emitting device of the present invention and properties of these organometallic complexes will be described. Then, the structure of the light-emitting device of the present invention and its manufacturing method will be described, and examples of light-emitting devices will be described.

Embodiment approach 1

[0276] [Embodiment 1: Synthesis example of organometallic complex and properties of the complex]

Synthetic example 1

[0278] This synthesis example is {2,3-bis(4-fluorophenyl)quinoxalinato (quinoxalinato)} (acetylacetonato) iridium (III) represented by formula (16) (abbreviation: Ir(Fdpq) 2 (acac)) synthesis example.

[0279]

[0280] First, 3.71 g of 4,4'-difluorobenzoyl and 1.71 g of o-phenylenediamine were heated and stirred in a solvent (200 mL of chloroform) for 6 hours. The reaction solution was cooled to room temperature, washed with HCl (1N) and a saturated aqueous solution of sodium chloride, and dried over magnesium sulfate. The solvent was removed to obtain the ligand HFdpq (2,3-bis(4-fluorophenyl)quinoxaline) (pale yellow powder, yield: 99%).

[0281] The synthesis scheme and structural formula of the ligand HFdpq are shown in the following formula (60).

[0282]

[0283] 2 Cl] 2 >

[0284] Using a mixture of 30 mL of 2-ethoxyethanol and 10 mL of water as solvent, with 3.61 g of ligand HFdpq (2,3-bis(4-fluorophenyl)quinoxaline) and 1.35 g of iridium chloride (IrCl 3 ·HCl...

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Abstract

It is an object of the present invention to obtain an organometallic complex that is capable of converting an excited triplet state into luminescence, a light-emitting element that can be driven for a long time, is high in luminous efficiency, and has a favorable long lifetime, and a light-emitting device using the light-emitting element. The present invention provides a light-emitting element that has a pair of electrodes (an anode and a cathode) and a light-emitting layer between a pair of electrodes, where the light-emitting layer includes an organometallic complex represented by the following general formula (5) and one of a compound that has a larger energy gap than the organometallic complex and a compound that has a larger ionization potential and a smaller electron affinity than the organometallic complex, and provides a light-emitting device using the light-emitting device.

Description

technical field [0001] The present invention relates to an organometallic complex capable of converting an excited triplet state into light, a light-emitting element using the organometallic complex, and a light-emitting device using the light-emitting element. Background technique [0002] A light-emitting element using an organic compound is an element in which a layer containing an organic compound or a thin film of the organic compound emits light when an electric field is applied. Its light-emitting mechanism is said to be as follows: When a voltage is applied to electrodes sandwiching an organic compound thin film, an electron injected from the cathode and a hole injected from the anode recombine in the organic compound thin film to form a molecular exciton. When the molecular excitons return to the ground state, energy is released to emit light. [0003] In such a light-emitting element, the organic compound layer is usually formed as a thin film of about 1 micron or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/14C09K11/06
Inventor 大泽信晴安部宽子井上英子下垣智子瀬尾哲史
Owner SEMICON ENERGY LAB CO LTD
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