Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/2887
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Title: Luminous and tunable white-light upconversion for YAG (Yb₃Al₅O₁₂) and (Yb, Y)₂O₃ nanopowders
Authors: Wang, J
Hao, JH 
Tanner, PA
Issue Date: 1-Dec-2010
Source: Optics letters, 1 Dec. 2010, v. 35, no. 23, p. 3922-3924
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 10–15 lm W⁻¹, 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.
Keywords: Charge transfer
Combustion synthesis
Ion exchange
Luminescence
Nanostructured materials
Ytterbium
Publisher: Optical Society of America
Journal: Optics letters 
ISSN: 0146-9592
EISSN: 1539-4794
DOI: 10.1364/OL.35.003922
Rights: © 2010 Optical Society of America. This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-35-23-3922. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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