Aromatic heterocyclic derivative, material for organic electroluminescent element, and organic electroluminescent element

A technology of electroluminescent elements and aromatic heterocycles, applied in the directions of luminescent materials, electrical components, organic semiconductor devices, etc.

Active Publication Date: 2013-10-30
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, fluorescent elements using fluorescent materials have been developed to improve their lifespan. Although they are being used in full-color displays such as mobile phones and televisions, there is a problem that higher efficiency than phosphorescent elements is required.

Method used

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  • Aromatic heterocyclic derivative, material for organic electroluminescent element, and organic electroluminescent element
  • Aromatic heterocyclic derivative, material for organic electroluminescent element, and organic electroluminescent element
  • Aromatic heterocyclic derivative, material for organic electroluminescent element, and organic electroluminescent element

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no. 1 Embodiment approach

[0423] This embodiment utilizes the TTF phenomenon. First, the TTF phenomenon will be described below.

[0424] Holes and electrons injected from the anode and cathode recombine in the light-emitting layer to generate excitons. According to conventional knowledge, the spin state is 25% for singlet excitons and 75% for triplet excitons. In conventionally known fluorescent devices, 25% of the singlet excitons emit light when they return to the ground state, and the remaining 75% of the triplet excitons do not emit light, but return to the ground state through thermal inactivation. Therefore, in the past, the theoretical boundary value of the internal quantum efficiency of the fluorescent element was 25%.

[0425]On the other hand, theoretically explore the behavior of triplet excitons generated inside organic substances. According to S.M.Bachilo (J.Phys.Cem.A, 104, 7711 (2000)), it is assumed that high-level excitons such as quintets return to triplet states immediately, an...

no. 2 approach

[0797] Figure 8 A schematic diagram showing an example of the organic EL element 2 according to the second embodiment.

[0798] The organic EL element of the present embodiment may be provided with an electron injection layer, Figure 8 The organic EL element 2 according to the second embodiment shown includes an anode 10 , a hole transport region 60 , a light emitting layer 20 , an electron transport region (blocking layer 30 in this embodiment), and a cathode 50 in this order. In the organic EL element of this embodiment, these layers are adjacent to each other.

[0799] The barrier layer 30 of the organic EL element 2 contains the aromatic heterocyclic derivative represented by the above-mentioned general formula (1), as in the first embodiment. In addition, other layers constituting the organic EL element 2 are also the same as those of the first embodiment.

no. 3 approach

[0801] Figure 9 A schematic diagram showing an example of the organic EL element 3 according to the third embodiment.

[0802] The organic EL element of the present invention may be provided with an electron injection layer on the cathode side of the electron transport layer, Figure 9 The organic EL element 3 according to the third embodiment shown is provided with an anode 10, a hole transport region 60, a light emitting layer 20, an electron transport region (in this embodiment, a blocking layer 30, an electron transport layer 41, and an electron transport layer 41) in the following order. injection layer 40), cathode 50. In this embodiment, these layers are adjacent to each other.

[0803] In the organic EL element 3, at least one of the electron injection layer 40 and the electron transport layer 41 preferably contains the above-mentioned aromatic heterocyclic derivative of the present invention. As the material contained in the electron transport layer, the materials...

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Abstract

This organic electroluminescent element is provided with an anode, a light-emitting layer, an electron transport band and a cathode, in that order. The electron transport band includes an aromatic heterocyclic derivative represented by general formula (1). In general formula (1), X1 to X3 are each a nitrogen atom or CR1, while A is represented by general formula (2). In general formula (2), L1 is a single bond or a linking bond, while HAr is represented by general formula (3). In general formula (3), Y1 is an oxygen atom or a sulfur atom, etc., and one of X11 to X18 is a carbon atom linked by a single bond to L1, while the others are a nitrogen atom or CR13.

Description

technical field [0001] The present invention relates to an organic electroluminescent element, an aromatic heterocyclic derivative that can be used in the organic electroluminescent element, and a material for an organic electroluminescent element containing the aromatic heterocyclic derivative. Background technique [0002] Organic electroluminescence elements (hereinafter sometimes referred to as organic EL elements) can be classified into two types, fluorescent type and phosphorescent type, according to the principle of light emission. When a voltage is applied to the organic EL element, holes from the anode and electrons from the cathode are injected, and they recombine in the light-emitting layer to form excitons. According to the electron spin statistics method, singlet excitons and triplet excitons are generated at a ratio of 25%:75%. Since the fluorescent type uses singlet excitons to emit light, its internal quantum efficiency is limited to 25%. Recently, fluo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50C07D405/10C07D405/14C07D409/10C07D409/14C09K11/06
CPCC07D405/10H01L51/5004H01L51/0067H01L51/50H01L51/0054H01L51/0071H01L51/0074H01L51/0052H01L51/0073C07D405/14H01L51/5072C07D409/14C07D409/10C07D519/00C09K11/025C09K11/06C07D471/04C07D491/048C07F7/0816C09K2211/1096C09K2211/1092C09K2211/1088C09K2211/1029C09K2211/1011C09K2211/1007C09K2211/1059C09K2211/1044H10K85/649H10K85/622H10K85/615H10K85/654H10K85/6576H10K85/6574H10K85/657H10K50/11H10K2101/40H10K85/6572H10K50/16H10K50/00H10K85/623H10K50/18H10K50/171H10K2101/10H10K2101/30H10K2102/101H10K2102/351
Inventor 水谷清香佐土贵康
Owner IDEMITSU KOSAN CO LTD
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