Abstract

We report on multiphoton white-light upconversion in vacuum for Pechini synthesis Yb3Al5O12 (YbAG) and combustion synthesis (Yb,Y2)O3 nanopowders under IR excitation. Their intense white-light upconversion is attributed to charge transfer luminescence superimposed upon a broadband emission. Unlike common nanoscale phosphors, which show low luminescence efficiency, the intensity of white-light upconversion for nanopowders is similar to that of their bulk counterparts. The luminary efficacy of the upconversion is estimated to be 1015lmW1, and the Commission Internationale d’Eclairage (CIE) coordinates can be widely tuned by the excitation power, pressure, and codoping ratio. The nano-YbAG sample exhibits a longer buildup time for emission, a higher excitation threshold, and a wider CIE range than the oxide nanopowders.

© 2010 Optical Society of America

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