Abstract

We realize high luminous efficiency (LE) in white polymer light-emitting devices by employing a wide bandgap polymer P36HCTPSi as host and introducing a blue–yellow two-color system for obtaining white emission. Phosphorescent dopants bis[(4,6-difluorophenyl)pyridinato-N,C2]-(picolinato)iridium(III) (FIrpic) and iridium(III) bis(2-(9,9’-spirobi[fluorene]-7-yl)pyridine-N,C2) acetylacetonate [Ir(SBFP)2 (acac)] were used as blue and yellow emitters, respectively. Electroluminescent spectra and LE were both affected by Ir(SBFP)2(acac) concentration; the device with low concentration (0.4 wt.%) showed white emission with a LE of 24.1cd/A at 1000cd/m2, while the one with high concentration (4 wt.%) emitted yellowish-white light with a higher LE of 47.3cd/A at 1000cd/m2.

© 2010 Optical Society of America

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