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 T_c=5878 K, color rendering index R_a=77, and color quality scale Q_a=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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