Abstract

We report on hybrid light-emitting devices based on the emission of phosphorescent sensitized colloidal CdSe/ZnS quantum dots (QDs). Emission lifetime measurements demonstrated that the energy transfer (ET) from square-planar platinum(II) complex $[4\text{-}{\mathrm{CF}}_3\text{-}(\mathrm{N}^\mathrm{C}^\mathrm{N})\mathrm{PtC}\equiv {\mathrm{CC}}_6\mathrm{H}\text{-}{4}^{\prime }\text{-}\mathrm{F}]$ ($\mathrm{N}^\mathrm{CH}^\mathrm{N}=1$, 5-bis(2’-pyridyl)benzene) (Pt-2) to QDs is more efficient than that from octahedral iridium(III) complex bis[(4,6-difluorophenyl)pyridinato-N, ${\mathrm{C}}^2$]-(picolinato)iridium (FIrpic). This different ET efficiency might be attributed to the different spatial structures between Pt-2 and FIrpic. Pure red emission with CIE coordinates of (0.66, 0.33) and maximum external quantum efficiency of 2.08% and white emission with power efficiency of $3.15\mathrm{lm}/\mathrm{W}$ were realized at different concentrations of Pt-2 and QDs, respectively.

©2012 Optical Society of America

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