LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, AUTHENTICATION DEVICE, AND ELECTRONIC APPARATUS
申请人:SEIKO EPSON CORPORATION
公开号:US20170141337A1
公开(公告)日:2017-05-18
To provide a light-emitting element which emits light in a near-infrared range and has high efficiency and long life, and a light-emitting device, an authentication device, and an electronic apparatus, each of which includes this light-emitting element.
A light-emitting element
1
of the invention includes an anode
3
, a cathode
8
, a light-emitting layer
5
which is provided between the anode
3
and the cathode
8
and emits light in a wavelength range of 700 nm or more by applying a current between the anode
3
and the cathode
8
, and an electron transport layer
6
which is provided between the light-emitting layer
5
and the cathode
8
, and includes a first electron transport layer
6
b
located on the cathode
8
side and a second electron transport layer
6
a
located on the light-emitting layer
5
side, wherein the first electron transport layer
6
b
contains a first anthracene-based compound, which has an anthracene skeleton and a nitrogen-containing heterocyclic skeleton, and has an average thickness of less than 8 nm, and the second electron transport layer
6
a
contains a second anthracene-based compound, which has an anthracene skeleton but does not have a heterocyclic skeleton.
为提供一个在近红外范围内发光并具有高效率和长寿命的发光元件,以及包括该发光元件的发光器件、认证器件和电子设备。该发明的发光元件包括阳极、阴极、位于阳极和阴极之间的发光层,在施加阳极和阴极之间的电流时,在700纳米或更长波长范围内发光,以及位于发光层和阴极之间的电子传输层,包括位于阴极侧的第一电子传输层和位于发光层侧的第二电子传输层。第一电子传输层包含第一蒽衍生物,具有蒽骨架和含氮杂环骨架,并且平均厚度小于8纳米;第二电子传输层包含第二蒽衍生物,具有蒽骨架但没有杂环骨架。