Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device
申请人:Semiconductor Energy Laboratory Co., Ltd.
公开号:US20140183503A1
公开(公告)日:2014-07-03
Disclosed is a light-emitting element having high emission efficiency, capable of driving at low voltage, and showing a long lifetime. The light-emitting element contains a compound between a pair of electrodes, and the compound is configured to give a first peak of m/z around 202 and a second peak of m/z around 227 in a mass spectrum. The first and second peaks are product ions of the compound and possess compositions of C
16
H
9
and C
17
H
10
N, respectively, which are derived from a dibenzo[f,h]quinoline unit.