申请人:Semiconductor Energy Laboratory Co., Ltd.
公开号:US07951470B2
公开(公告)日:2011-05-31
According to the present invention, a light-emitting element, a light-emitting device, and a lighting system, each of which has a broad spectrum like sunlight and has high color rendering properties, can be obtained. One embodiment of the present invention has a light-emitting device which includes at least two kinds of luminescence center materials, and at least one kind of the luminescence center materials is a quinoxaline derivative represented by the following general formula (1):
wherein R1 to R4 are individually hydrogen or an alkyl group having 4 carbon atoms (a straight-chain structure or a branch structure).
根据本发明,可以获得具有类似太阳光谱和高色彩再现性的发光元件、发光装置和照明系统。本发明的一种实施例具有包括至少两种发光中心材料的发光装置,其中至少一种发光中心材料是由下列通式(1)表示的喹喔啉衍生物:其中R1至R4分别为氢或具有4个碳原子的烷基(直链结构或支链结构)。