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Up-conversion white light of Tm3+/Er3+/Yb3+ tri-doped CaF2 phosphors

✍ Scribed by Chunyan Cao; Weiping Qin; Jisen Zhang; Yan Wang; Guofeng Wang; Guodong Wei; Peifen Zhu; Lili Wang; Longzhen Jin

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
354 KB
Volume
281
Category
Article
ISSN
0030-4018

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✦ Synopsis

Tm 3+ /Er 3+ /Yb 3+ tri-doped CaF 2 phosphors were synthesized using a hydrothermal method. The phosphors were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and up-conversion (UC) emission spectra. After annealing, the phosphors emitted white light under a 980 nm continuous wave diode laser (CW LD 2 W) excitation. As the excitation power density changed in the range of 20-260 W/cm 2 , the chromaticity coordinates of the UC light of the phosphor Ca 0.885 Tm 0.005 Er 0.01- Yb 0.1 F 2 fell well in the white region of the 1931 CIE diagram. For the proportion of red, green and blue (RGB) in white light is strict, key factors for achieving UC white light, such as host materials, rare earth ions doping concentrations, annealing temperatures, as well as the excitation power densities, were investigated and discussed.

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