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NIR-to-blue, green, orange and white up-conversion luminescence in Yb3+/Tm3+/Er3+/Ho3+-doped Na0.5Gd0.5WO4 nanocrystals

ZHIGUO XIA1,* , HAIYAN DU2, JIAYUE SUN2

Affiliation

  1. School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China
  2. College of Chemistry and Environmental Engineering, Beijing Technology and Business University, Beijing 100048, China

Abstract

Yb3+/Tm3+/Er3+/Ho3+-doped Na0.5Gd0.5WO4 nanocrystals have been fabricated by a facile hydrothermal method. The blue, green and orange upconversion (UC) emissions coming from Yb3+/Tm3+, Yb3+/Er3+, Yb3+/Ho3+ dopant ions are observed in this study. Bright white luminescence upon 980 nm excitation can be produced via the UC process by tuning the dopant ions Yb3+/Tm3+/Ho3+, which consists of the blue, green and red UC emissions, and they correspond to the transitions 1 G4 → 3 H6 of Tm3+, 5 F4( 5 S2) → 5 I8, and 5 F5 → 5 I8 of Ho3+ ions, respectively. The UC mechanisms and temperature dependent UC luminescence were also discussed..

Keywords

Optical materials; Phosphors, Upconversion luminescence, Optical properties.

Submitted at: March 1, 2010
Accepted at: May 26, 2010

Citation

ZHIGUO XIA, HAIYAN DU, JIAYUE SUN, NIR-to-blue, green, orange and white up-conversion luminescence in Yb3+/Tm3+/Er3+/Ho3+-doped Na0.5Gd0.5WO4 nanocrystals, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 5, pp. 975-979 (2010)