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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 35, Iss. 23 — Dec. 1, 2010
  • pp: 3922–3924

Luminous and tunable white-light upconversion for YAG ( Yb 3 Al 5 O 12 ) and ( Yb , Y ) 2 O 3 nanopowders

Jiwei Wang, Jian Hua Hao, and Peter A. Tanner  »View Author Affiliations


Optics Letters, Vol. 35, Issue 23, pp. 3922-3924 (2010)
http://dx.doi.org/10.1364/OL.35.003922


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Abstract

We report on multiphoton white-light upconversion in vacuum for Pechini synthesis Yb 3 Al 5 O 12 (YbAG) and combustion synthesis ( Yb , Y 2 ) O 3 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.

© 2010 Optical Society of America

OCIS Codes
(040.5150) Detectors : Photoconductivity
(140.6810) Lasers and laser optics : Thermal effects
(160.5690) Materials : Rare-earth-doped materials
(170.6280) Medical optics and biotechnology : Spectroscopy, fluorescence and luminescence
(140.3613) Lasers and laser optics : Lasers, upconversion

ToC Category:
Materials

History
Original Manuscript: September 13, 2010
Manuscript Accepted: October 11, 2010
Published: November 22, 2010

Citation
Jiwei Wang, Jian Hua Hao, and Peter A. Tanner, "Luminous and tunable white-light upconversion for YAG (Yb3Al5O12) and (Yb,Y)2O3 nanopowders," Opt. Lett. 35, 3922-3924 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-23-3922


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