Title:
発光素子、発光装置、電子機器、及び照明装置
Document Type and Number:
Japanese Patent JP6411045
Kind Code:
B2
Abstract:
A light-emitting element which includes a plurality of light-emitting layers between a pair of electrodes and has low driving voltage and high emission efficiency is provided. A light-emitting element including first to third light-emitting layers between a cathode and an anode is provided. The first light-emitting layer includes a first phosphorescent material and a first electron-transport material; the second light-emitting layer includes a second phosphorescent material and a second electron-transport material; the third light-emitting layer includes a fluorescent material and a third electron-transport material; the first to third light-emitting elements are provided in contact with an electron-transport layer positioned on a cathode side; and a triplet excitation energy level of a material included in the electron-transport layer is lower than triplet excitation energy levels of the first electron-transport material and the second electron-transport material.
Inventors:
Suzuki Tsunetori
Naoaki Hashimoto
Eriko Saijo
Tetsushi Seo
Naoaki Hashimoto
Eriko Saijo
Tetsushi Seo
Application Number:
JP2014061071A
Publication Date:
October 24, 2018
Filing Date:
March 25, 2014
Export Citation:
Assignee:
Semiconductor Energy Laboratory Co., Ltd.
International Classes:
H01L51/50; H05B33/12
Domestic Patent References:
| JP2006140434A | ||||
| JP2012238854A | ||||
| JP2012186021A | ||||
| JP2006135295A | ||||
| JP2006128636A | ||||
| JP2008146904A |
Foreign References:
| WO2010143434A1 | ||||
| WO2012008331A1 |