TITLE

Blue phosphorescent dye as sensitizer and emitter for white organic light-emitting diodes

AUTHOR(S)
Gangtie Lei; Liduo Wang; Yong Qiu
PUB. DATE
November 2004
SOURCE
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5403
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We demonstrate high-efficiency white organic light-emitting diodes with blue electrophosphorescent and red phosphor-sensitized electrofluorescent emission. The phosphorescent dye, bis[(4,6-difluorophenyl)-pyridinato-N,C2] (picolinato) Ir(III) (FIrpic) and the fluorescent dye, 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl) (DCJTB) are co-doped into host material, N,N′-dicarbazolyl-1, 4-dimethene-benzene (DCB). The device with 8% (weight ratio) FIrpic and 0.4% (weight ratio) DCJTB exhibits white emission and the maximum current efficiency and luminance are 9.2 cd/A and 18 200 cd/m2, respectively. For comparison, a device without FIrpic is fabricated which has poor performance. These results indicate that the blue phosphorescent dye acts not only as emitter but also as phosphorescent sensitizer for fluorescent dye.
ACCESSION #
15244104

 

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