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,$C^2$]-(picolinato)iridium(III) (FIrpic) and iridium(III) bis(2-(9,9’-spirobi[fluorene]-7-yl)pyridine-N,$C^{2\prime }$) acetylacetonate [$\mathrm{Ir}(\mathrm{SBFP}{)}_2$ (acac)] were used as blue and yellow emitters, respectively. Electroluminescent spectra and LE were both affected by $\mathrm{Ir}(\mathrm{SBFP}{)}_2$(acac) concentration; the device with low concentration ($0.4\text{wt}\mathrm{.}\%$) showed white emission with a LE of $24.1\mathrm{cd}/\mathrm{A}$ at $1000\mathrm{cd}/{\mathrm{m}}^2$, while the one with high concentration ($4\text{wt}\mathrm{.}\%$) emitted yellowish-white light with a higher LE of $47.3\mathrm{cd}/\mathrm{A}$ at $1000\mathrm{cd}/{\mathrm{m}}^2$.

© 2010 Optical Society of America

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