Efficient spectrally dynamic blue-to-green emission of bipyridine-based bridged silsesquioxanes for solid-state lighting

resumo

We report a metal-free bpy-bridged silsesquioxane displaying an efficient and tuneable blue-to-green emission (maximum quantum yield and luminance values of 0.22 +/- 0.02 and 63 +/- 3 cd m(-2), respectively) when excited by commercial InGaN light emitting diodes (LEDs) (385-405 nm). This is the highest quantum yield value reported so far for metal-free phosphors easily excited by commercial InGaN long-UV/blue LEDs bringing organic/inorganic hybrids on the way to applications as metal-free phosphors for smart LED-based lighting and LED-addressed displays. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

palavras-chave

ORGANIC-INORGANIC HYBRIDS; METAL ACTIVATOR IONS; PHOTOLUMINESCENCE; PHOSPHORS; CENTERS

categoria

Materials Science; Physics

autores

Nobre, SS; Cattoen, X; Ferreira, RAS; Man, MWC; Carlos, LD

nossos autores

agradecimentos

Supports of EMMI, CNRS, FCT and FEDER (PTDC/CTM/72093/2006) are gratefully acknowledged. L.D.C. thanks University of Montpellier for a visiting scientist fellowship and S.S.N. thanks FCT grant (SFRH/BD/28739/06).

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