Abstract

The absorption spectra, excitation spectra, and emission spectra of Tb3+/Eu3+ ions in LiYF4 single crystals synthesized by an improved Bridgman method are measured. The emission spectra of several bands, mainly located at blue ∼487  nm (Tb:D45→F76), yellowish green ∼542  nm (Tb:D45→F75), and red ∼611  nm (Eu:D05→F72) wavelengths, are observed under excitation by UV light. An ideal white light emission as a result of simultaneous combination of these emissions can be obtained from 1.11 mol% Tb3+ and 0.9  mol%   Eu3+ co-doped LiYF4 single crystals with chromaticity coordinates of x=0.3242, y=0.3389, color temperature Tc=5878  K, color rendering index Ra=77, and color quality scale Qa=75 under excitation of 384 nm light. The chromaticity coordinate, color rendering index, and color quality scale can be modified by the change of the concentration of rare-earth dopants and the excitation wavelength.

© 2015 Chinese Laser Press

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