US 9,812,655 B2
Light-emitting element, light-emitting device, electronic appliance, and lighting device
Hideko Inoue, Kanagawa (JP); Tomoka Nakagawa, Kanagawa (JP); Satoshi Seo, Kanagawa (JP); Nobuharu Ohsawa, Kanagawa (JP); and Kunihiko Suzuki, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., (JP)
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Filed on Nov. 27, 2013, as Appl. No. 14/91,966.
Claims priority of application No. 2012-261797 (JP), filed on Nov. 30, 2012.
Prior Publication US 2014/0151662 A1, Jun. 5, 2014
Int. Cl. H01L 51/00 (2006.01); H01L 51/50 (2006.01); H01L 51/52 (2006.01)
CPC H01L 51/0085 (2013.01) [H01L 51/5016 (2013.01); H01L 51/5278 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A light-emitting element comprising:
a first organic compound;
a second organic compound; and
a third organic compound,
wherein an absorption edge of an absorption spectrum of the third organic compound is 440 nm or less,
wherein the second organic compound comprises:
a 1,2,4-triazole skeleton;
a phenyl skeleton;
an arylene skeleton; and
a metal selected from Group 9 or Group 10,
wherein nitrogen at the 4-position of the 1,2,4-triazole skeleton coordinates to the metal and nitrogen at the 1-position of the 1,2,4-triazole skeleton is bonded to the phenyl skeleton,
wherein the arylene skeleton is bonded to the 3-position of the 1,2,4-triazole skeleton and the metal,
wherein an alkyl group having 1 to 4 carbon atoms is bonded to the 5-position of the 1,2,4-triazole skeleton and the metal, and
wherein by ToF-SIMS analysis, the second organic compound gives a peak of a precursor ion in a range of m/z=600 to m/z=2000 and a peak of a product ion in a range of m/z=75 to m/z=300.