Aromatic heterocyclic derivative, and organic electroluminescent element comprising same

A technology of aromatic heterocycles and derivatives, applied in electrical components, organic chemistry, silicon organic compounds, etc., can solve the problems of reduced efficiency, low minimum excited triplet energy, insufficient drive durability, etc.

Inactive Publication Date: 2012-07-04
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is described that the bisphenoxazine derivatives are easy to transfer charges and exhibit excellent cyan light emission characteristics, but there is no description about teaching the combination with a phosphorescent light emitting layer at all.
[0008] In addition, the lowest excited triplet state energy (T1) of phenoxazine derivatives is small, so when they are used together with phosphorescent materials (especially cyan phosphorescent materials with short emission wavelengths), there are the following problems: the luminescence of the phosphorescent luminescent material is extinction, Greatly reduced efficiency, insufficient drive durability

Method used

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  • Aromatic heterocyclic derivative, and organic electroluminescent element comprising same
  • Aromatic heterocyclic derivative, and organic electroluminescent element comprising same
  • Aromatic heterocyclic derivative, and organic electroluminescent element comprising same

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no. 1 approach

[0205] The organic EL element of this embodiment has an element structure having at least one light-emitting layer. Specific configuration examples are shown below.

[0206] (1) Anode / luminescent layer / electron injection / transport layer / cathode

[0207] (2) Anode / hole injection / transport layer / luminescent layer / electron injection / transport layer / cathode

[0208] (3) Anode / hole injection layer / hole transport layer / light emitting layer / electron injection / transport layer / cathode

[0209] In this specification, "hole injection and transport layer" refers to "one or both of the hole injection layer and the hole transport layer", and "electron injection and transport layer" refers to "the electron injection layer and the electron transport layer". one or both of the layers". In addition, unless otherwise specified, the light-emitting layer includes both fluorescence and phosphorescence.

no. 2 approach

[0211] The organic EL element of this embodiment has a tandem element configuration having at least two light-emitting layers (units including light-emitting layers).

[0212] Interposing a charge generation layer (also referred to as CGL) between the two light-emitting layers allows an electron transport region to be provided in each cell.

[0213] A specific example of the configuration composed of serial elements is shown below.

[0214] Anode / hole injection / transport layer / fluorescence layer / charge generation layer / fluorescence layer / electron injection / transport layer / cathode

[0215] Anode / hole injection / transport layer / fluorescence layer / electron injection / transport layer / charge generation layer / fluorescence layer / cathode

[0216] Anode / hole injection / transport layer / fluorescence layer / electron injection / transport layer / charge generation layer / fluorescence layer / blocking layer / cathode

[0217] Anode / hole injection / transport layer / phosphorescent layer / charge generation ...

no. 3 approach

[0220] The organic EL element of this embodiment includes a plurality of light emitting layers, and has a charge blocking layer between arbitrary two light emitting layers of the plurality of light emitting layers.

[0221] As the structure of the organic EL element preferable as the third embodiment, as described in Japanese Patent No. 4134280, U.S. Laid-Open Patent Publication US2007 / 0273270A1, and International Laid-Open Publication WO2008 / 023623A1, the anode, the first light-emitting layer, and the charge blocking Layer, the second light-emitting layer, and the cathode are sequentially stacked, and there is a structure in which an electron transport region has a barrier layer for preventing diffusion of triplet excitons between the second light-emitting layer and the cathode. Here, the charge blocking layer refers to a layer having a function of regulating the injection of carriers into the light-emitting layer by providing energy barriers of HOMO level and LUMO level betwe...

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Abstract

An aromatic heterocyclic derivative represented by formula (1); a material for an organic electroluminescent element; and an organic electroluminescent element comprising the derivative or the material.

Description

technical field [0001] The present invention relates to an aromatic heterocyclic derivative and an organic electroluminescent element using the aromatic heterocyclic derivative. Background technique [0002] Organic electroluminescent (EL) elements are expected to be used as solid-state light-emitting inexpensive large-area full-color display elements, and many developments have been made. A general organic EL element is composed of a light-emitting layer and a pair of opposing electrodes sandwiching the layer. When an electric field is applied between the two electrodes, electrons are injected from the cathode side and holes are injected from the anode side. Furthermore, the electrons recombine with holes in the light-emitting layer to form an excited state, and when the excited state returns to the ground state, energy is emitted in the form of light. [0003] In addition, a phosphorescent organic EL element using an organic phosphorescent material in a light-emitting la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D219/02C07D401/04C07D405/14C07D409/14H01L51/50
CPCH01L51/0072C07D471/04C07F7/0816H01L51/0059H01L51/0085C07D405/04C07D403/14C07D409/14C07D219/02C07D401/14C07F7/08C07D407/04C07D409/04C07D407/14H01L51/0073C07D405/14C07D401/04H10K85/631H10K85/6574H10K85/342H10K85/6572H10K85/6576
Inventor 加藤朋希西村和树
Owner IDEMITSU KOSAN CO LTD
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