Title:
LIGHT-EMITTING DEVICE
Document Type and Number:
Japanese Patent JP2019040884
Kind Code:
A
Abstract:
To provide a light-emitting element that can emit light with high luminance even when a driving voltage is low and that has a long lifetime.SOLUTION: A light-emitting element includes a first layer that has n (n is a natural number of 2 or more) EL layers provided between the anode and the cathode and a first donor substance between the m-th (m is a natural number, 1≤m≤n-1) EL layer and the m+1-th EL layer from the anode, which is in contact with the m-th EL layer, a second layer including an electron transporting substance in contact with the first layer and a second donor substance, and a third layer including a hole transporting substance and an acceptor substance in contact with the second layer and the m+1-th EL layer.SELECTED DRAWING: Figure 1
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Inventors:
SEO HIROMI
SEO TETSUSHI
OSAWA NOBUHARU
USHIKUBO TAKAHIRO
TSUTSUI TETSUO
SEO TETSUSHI
OSAWA NOBUHARU
USHIKUBO TAKAHIRO
TSUTSUI TETSUO
Application Number:
JP2018232552A
Publication Date:
March 14, 2019
Filing Date:
December 12, 2018
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB CO LTD
International Classes:
H05B33/12; H01L51/50
Domestic Patent References:
| JP2006012793A | 2006-01-12 | |||
| JP2008537314A | 2008-09-11 | |||
| JP2006210845A | 2006-08-10 | |||
| JP2006135295A | 2006-05-25 |