Abstract
The absorption spectra, excitation spectra, and emission spectra of Tb3t/Eu3t 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:5D4 -> 7F6), yellowish green ~542 nm (Tb:5D4 -> 7F5), and red ~611 nm (Eu:5D0 -> 7F2) 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.
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