title: Bright and monochromic red light-emitting electroluminescence devices based on a new multifunctional europium ternary complex.
abstract: A novel europium(III) complex, tris(dibenzoylmethanato)(2-4'-triphenylamino)imidazo[4,5-f]1,10-phenanthroline)europium(III), Eu(DBM)3(TPIP), is synthesized. The light-emitting center, hole-transporting triphenylamine and electron-transporting phenanthroline fragments are integrated into one molecule. A single-layer device of ITO/Eu(DBM)3(TPIP) (60 nm)/Mg0.9Ag0.1/Ag exhibits Eu(III)-based pure red emission with a maximum brightness of 19 cd m(-2) at 13.5 V and 280 mA cm(-2), and an onset driving voltage of 8 V. A four-layer device of ITO/TPD (20 nm)/Eu(DBM)3(TPIP) (40 nm)/BCP (20 nm)/AlQ(40 nm)/Mg0.9Ag0.1/Ag gives a maximum Eu(III)-based pure red emitting luminance of 1305 cd m(-2) at 16 V and 255 mA cm(-2) with an onset driving voltage of 6 V; the maximum external quantum yield and luminous yield are estimated to be 0.85% and 1.44 lm W(-1), respectively, at 7.5 V and 0.25 mA cm(-2).
authors.affiliation: Department of Chemistry, Beijing Normal University, Beijing 100875, PR China.
authors.forename: Min
authors.initials: M
authors.lastname: Sun
authors.forename: Hao
authors.initials: H
authors.lastname: Xin
authors.forename: Ke-Zhi
authors.initials: KZ
authors.lastname: Wang
authors.forename: Yong-An
authors.initials: YA
authors.lastname: Zhang
authors.forename: Lin-Pei
authors.initials: LP
authors.lastname: Jin
authors.forename: Chun-Hui
authors.initials: CH
authors.lastname: Huang