TITLE

Highly efficient red electrophosphorescent devices based on an iridium complex with trifluoromethyl-substituted pyrimidine ligand

AUTHOR(S)
Niu, Yu-hua; Baoquan Chen; Liu, Sen; Yip, Hinlap; Bardecker, Julie; Jen, Alex K.-Y; Kavitha, Jakka; Yun Chi; Ching-fong Shu; Tseng, Ya-hsien; Chen-han Chien
PUB. DATE
August 2004
SOURCE
Applied Physics Letters;8/30/2004, Vol. 85 Issue 9, p1619
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Highly efficient red-emitting electrophosphorescent devices were fabricated by doping an iridium (Ir) complex containing trifluoromethyl (CF3)-substituted pyrimidine ligand into a conjugated bipolar polyfluorene with triphenylamine and oxadiazole as side chains. The device efficiency can be enhanced through effective exciton confinement using a layer of 1,3,5-tris(N- phenylbenzimidazol-2-yl)benzene on the cathode side and a layer of in situ polymerized tetraphenyldiamine-perfluorocyclobutane on the anode side. For a blend with 5 wt % of the Ir complex, a maximum external quantum efficiency of 7.9 photon/electron % and a maximum brightness of 15800 cd/m2 are reached with Commission Internationale de L’Eclairage chromaticity coordinates of x=0.65 and y=0.34.
ACCESSION #
14258774

 

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