COMPOSITION AND LIGHT-EMITTING ELEMENT USING THE COMPOSITION
申请人:Akino Nobuhiko
公开号:US20110121236A1
公开(公告)日:2011-05-26
Disclosed is a composition comprising a compound having a saturated heterocyclic structure, in which the number of ring-constituting members containing a nitrogen atom is 5 or more, and a phosphorescent compound.