The absorption spectra,excitation spectra,and emission spectra of Tb~(3+)/Eu~(3+) ions in LiYF_4 single crystals synthesized by an improved Bridgman method are measured.The emission spectra of several bands,mainly located at blue ~487 nm(Tb:~5D_4 →~7F_6),yellowish green ~542 nm(Tb:~5D_4→~7F_5),and red ~611 nm(Eu:~5D_0→~7F_2) 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%Tb~(3+) and0.9 mol%Eu~(3+) co-doped LiYF_4 single crystals with chroniaticity 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 of384 nm light.The chroniaticity 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. The absorption spectra, excitation spectra, and emission spectra of Tb ~ (3 +) / Eu ~ (3+) ions in LiYF_4 single crystals synthesized by an improved Bridgman method are measured. The emission spectra of several bands, mainly located at blue ~ 487 nm (Tb: ~ 5D_4 → ~ 7F_6), yellowish green ~ 542 nm (Tb: ~ 5D_4 → ~ 7F_5) and red ~ 611 nm (Eu: ~ 5D_0 → ~ 7F_2) .An ideal white light emission as a result of the simultaneous combination of these emissions can be obtained from 1.11 mol% Tb ~ (3+) and 0.9 mol% Eu ~ (3+) co-doped LiYF_4 single crystals with chroniaticity 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 chroniatic 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.