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White Light Emitting Organic Electroluminescence Element, Display and Illuminator

a technology of electroluminescent elements and white light, applied in the direction of luminescent compositions, energy-saving lighting, sustainable buildings, etc., can solve the problems of deterioration of emission life, inability to achieve satisfactory performance for practical use, and inability to achieve satisfactory phosphorescent performance. , to achieve the effect of excellent cie chromatic of white light emission, high emission efficiency and high luminan

Inactive Publication Date: 2008-02-14
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an organic EL element that emits high-quality white light with high efficiency and excellent chromaticity. This is achieved by using a special combination of phosphorescent compounds, with one of them being a green light emitting ortho metalated complex. The ratio of this complex in the emission spectrum is important and should be at least 60% in a range of 400-800 nm. This patent is useful for creating displays and illuminators that produce high-quality white light.

Problems solved by technology

It has not been fully easy for a high efficiency phosphorescent material to satisfactorily shorten the emission wavelength and to improve the emission life, and a fully satisfactory performance for the practical use has not been obtained.
However, the emission life is notably deteriorated.

Method used

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  • White Light Emitting Organic Electroluminescence Element, Display and Illuminator
  • White Light Emitting Organic Electroluminescence Element, Display and Illuminator
  • White Light Emitting Organic Electroluminescence Element, Display and Illuminator

Examples

Experimental program
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Effect test

embodiment (

f)

[0247] The case in which at least one type of a platinum complex selected from a group comprised of following Formula (19)-(27) as the aforesaid blue light emitting ortho metalated complex.

[0248]

[0249] A platinum complex represented by Formula (19) according to the present invention will now be explained. In the present invention, those represented by a tautomer of said Formula (19) are also included.

[0250] In Formula (19), a substituent each independently represented by R1 and R2 includes, for example, an alkyl group (such as a methyl group, an ethyl group, an isopropyl group, a hydroxyethyl group, a methoxymethyl group, a trifluoromethyl group and a t-butyl group), a cycloalkyl group (such as a cyclopentyl group and a cyclohexyl group), an aralkyl group (such as a benzyl group and a 2-phenetyl group), an aryl group (such as a phenyl group, a p-chlorophenyl group, a mesityl group, a tolyl group, a xylyl group, a biphenylyl group, a naphtyl group, an anthoryl group and a phenant...

embodiment

g

[0300] The case in which at least one type of a platinum complex selected from a group comprising following Formulas (28)-(32) as the aforesaid blue light emitting ortho metalated complex.

[0301] A metal complex compound provided with a specific structure, which is represented by each of Formulas (28)-(32) according to the present invention, will now be explained.

[0302] In Formula (28) described above, Z11 together with a carbon atom and a nitrogen atom is an atomic group necessary to form an aromatic heterocyclic ring; Z12 together with a carbon atom is an atomic group necessary to form a non-aromatic ring; and M is a metal. An aromatic heterocyclic group formed by Z11 includes such as a pyridine ring, a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, a benzoimidazole ring, a benzothiazole ring, a benzooxazole ring, a quinazoline ring and a phthalazine ring. A non-aromatic ring formed by Z12 includes, for example, the rings described below.

[0303] In Formul...

embodiment h

[0314] The case in which at least one type of a platinum complex represented by following Formula (A) or (B) as the aforesaid blue light emitting ortho metalated complex.

[0315] At least one type of a platinum complex represented by following Formula (A) or (B) according to the present invention will now be explained.

[0316]

[0317] A platinum complex having a partial structure represented by Formula (A) according to the present invention will be explained.

[0318] A platinum complex represented by Formula (A) according to the present invention will be explained.

[0319] In Formula (A), a substituent represented by each of R1, R2, R3, R4, R5, R2 and R7 includes, for example, an alkyl group (such as a methyl group, an ethyl group, a propyl group, an isopropyl group, t-butyl group, a pentyl group, a hexyl group, an octyl group, a dodecyl group, a tridecyl group, a tetradecyl group and a pentadecyl group), a cycloalkyl group (such as a cyclopentyl group and a cyclohexyl group), an alkenyl ...

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Abstract

A white light emitting organic electroluminescent element comprising two electrodes having therebetween one or more constituting layers including a light emission layer, the one or more constituting layers comprising at least two phosphorescent compounds, wherein at least one of the phosphorescent compounds is a green light emitting ortho metalated complex; and a spectral ratio of the green light emitting ortho metalated complex in ae emission spectral distribution in a range of 400-800 nm is not less than 60%.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a white light emitting organic electroluminescent element, a display and an illuminator. BACKGROUND OF THE INVENTION [0002] As an emission type electronic display device, an electroluminescent device (ELD) is known. Elements constituting the ELD include an inorganic electroluminescent element and an organic electroluminescent element (hereinafter referred to also as an organic EL element). Inorganic electroluminescent element has been used for a plane light source, however, a high voltage alternating current has been required to drive the element. An organic EL element has a structure in which a light emitting layer containing a light emitting compound is arranged between a cathode and an anode, and an electron and a hole were injected into the light emitting layer and recombined to form an exciton. The element emits light, utilizing light (fluorescent light or phosphorescent light) generated by inactivation of the excit...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B9/04
CPCC09K11/06C09K2211/1022C09K2211/1029C09K2211/1033C09K2211/1037C09K2211/1044C09K2211/1059C09K2211/1074C09K2211/1092C09K2211/1096C09K2211/185H05B33/14Y02B20/00H10K85/649H10K85/654H10K85/657H10K85/322H10K85/341H10K85/324H10K85/346H10K85/361H10K85/342H10K85/6572H10K50/125H10K50/11H10K2101/10H10K85/658
Inventor NISHIZEKI, MASATOOSHIYAMA, TOMOHIRO
Owner KONICA MINOLTA INC
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