US 9,812,662 B2
Light-emitting element, light-emitting device, electronic device, and lighting device
Takeyoshi Watabe, Kanagawa (JP); and Satoshi Seo, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., (JP)
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Filed on Apr. 18, 2017, as Appl. No. 15/490,290.
Application 15/490,290 is a continuation of application No. 15/204,363, filed on Jul. 7, 2016, granted, now 9,634,267.
Application 15/204,363 is a continuation of application No. 14/150,388, filed on Jan. 8, 2014, granted, now 9,391,290, issued on Jul. 12, 2016.
Claims priority of application No. 2013-002296 (JP), filed on Jan. 10, 2013.
Prior Publication US 2017/0222172 A1, Aug. 3, 2017
Int. Cl. H01L 51/50 (2006.01); H01L 51/00 (2006.01)
CPC H01L 51/5028 (2013.01) [H01L 51/5016 (2013.01); H01L 51/006 (2013.01); H01L 51/0052 (2013.01); H01L 51/0061 (2013.01); H01L 51/0072 (2013.01); H01L 51/0074 (2013.01); H01L 51/0085 (2013.01); H01L 2251/556 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A light-emitting device comprising:
a light-emitting layer comprising a first organic compound and a second organic compound,
wherein the first organic compound is a guest material,
wherein emission time-dependence of emission intensity of the light-emitting layer is represented by a multicomponent decay curve, and
wherein an emission time of a longest lifetime component of the multicomponent decay curve at room temperature is less than or equal to 15 μsec where the emission time is a time required for a value of initial emission intensity to become 1/100.