Title:
An organic electroluminescence element, an organic electric field luminescence device, an organic EL display, and organic EL lighting
Document Type and Number:
Japanese Patent JP6191680
Kind Code:
B2
Abstract:
The present invention is to provide a highly efficient organic electroluminescence element which has a long life and an organic electroluminescence device which includes the element. The invention relates to an organic electroluminescence element which comprises an anode, a luminescent layer, two or more electron transport layers and a cathode, in this order, wherein at least one of the two or more electron transport layers adjoins the luminescent layer, the luminescent layer contains a luminescent material and a charge transport material, the electron transport layer which adjoins the luminescent layer contains a charge transport material, the charge transport material contained in the luminescent layer and the charge transport material contained in the electron transport layer which adjoins the luminescent layer may be the same material or may be different material, when an electron affinity of the charge transport material which serves to transport electrons, among the charge transport materials contained in the luminescent layer, is expressed by EA1, and an electron affinity of the charge transport material which is the highest in an absolute value of electron affinity, among the charge transport materials contained in the electron transport layer that adjoins the luminescent layer, is expressed by EA2, then EA1 and EA2 satisfy the relationship represented by the following expression (1), and when an electron affinity of the charge transport material which is the highest in an absolute value of electron affinity, among the charge transport materials contained in the electron transport layer located on the most cathode side among the two or more electron transport layers, is expressed by EA3, and a work function of the cathode is expressed by WF, then EA3 and WF satisfy the relationship represented by the following expression (2):
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Inventors:
Tadashi Tanaka
Okabe Kazuki
Atsushi Takahashi
Okabe Kazuki
Atsushi Takahashi
Application Number:
JP2015226807A
Publication Date:
September 06, 2017
Filing Date:
November 19, 2015
Export Citation:
Assignee:
Mitsubishi Chemical Corporation
International Classes:
H01L51/50; G09F9/30; H01L27/32; H05B33/26
Domestic Patent References:
| JP2007507107A | ||||
| JP2010114232A | ||||
| JP2007042875A | ||||
| JP2009102656A |
Foreign References:
| WO2008146800A1 |
Attorney, Agent or Firm:
Tsuyoshi Shigeno
Takayuki Shigeno
Takayuki Shigeno