Abstract

A Ce³⁺ ion-doped α-NaYF₄ single crystal of high quality is grown successfully by an improved flux Bridgman method under the conditions of taking the chemical raw composition of NaF:KF:YF₃:CeF₃ in the molar ratio of 30∶18∶48∶4, where the KF is shown to be an effective assistant flux. The x ray diffraction, absorption spectra, excitation spectra, and emission spectra of the Ce³⁺-doped α-NaYF₄ single crystal are measured to investigate the phase and optical properties of the single crystals. The absorption spectrum of the Ce³⁺:α-NaYF₄ shows a strong band that peaks at the wavelength of 300 nm. The emission spectrum of the Ce³⁺:α-NaYF₄ emits an intense ultraviolet (UV) band at the wavelength of 332 nm under the excitation of 300 nm light. Two separated luminous bands of 330 and 350 nm, which correspond to the transitions 5d→F_5/22 and 5d→F_7/22, can be obtained by Gauss fitting. The strong emission intensity at the UV band and the excellent optical transmission in the range of UV wavelengths indicate that Ce³⁺:α-NaYF₄ single crystals can be considered as a promising material for UV lasers.

© 2016 Chinese Laser Press

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