White light emission from Dy<sup>3+</sup>-doped LiLuF<sub>4</sub> single crystal grown by Bridgman method

Yan-ming Dong; Hai-ping Xia; Li Fu; Shan-shan Li; Xue-mei Gu; Jian-li Zhang; Dong-jie Wang; Yue-pin Zhang; Hao-chuan Jiang; Bao-jiu Chen

doi:10.1007/s11801-014-4052-4

Optoelectronics Letters ›› 2014, Vol. 10 ›› Issue (4) : 262-265. DOI: 10.1007/s11801-014-4052-4

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White light emission from Dy³⁺-doped LiLuF₄ single crystal grown by Bridgman method

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Abstract

Lithium lutetium fluoride (LiLuF₄) single crystals doped with different Dy³⁺ ion concentrations were grown by Bridgman method. The Judd-Ofelt (J-O) strength parameters (Ω₂, Ω₄, Ω₆) of Dy³⁺ in LiLuF₄ crystal are calculated according to the measured absorption spectra and the J-O theory, by which the asymmetry of the Dy³⁺:LiLuF₄ single crystal and the possibility of attaining stimulated emission from ⁴F_9/2 level are analyzed. The capability of the Dy³⁺:LiLuF₄ crystal in generating white light by simultaneous blue and yellow emissions under excitation with ultraviolet light is produced. The effects of excitation wavelength and doping concentration on chromaticity coordinates and photoluminescence intensity are also investigated. Favorable CIE coordinates, x=0.319 3 and y=0.349 3, can be obtained for Dy³⁺ ion in 2.701% molar doping concentration under excitation of 350 nm.

Keywords

Doping Concentration / Scheelite / Grown Crystal / Bridgman Method / Yellow Emission

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Yan-ming Dong, Hai-ping Xia, Li Fu, Shan-shan Li, Xue-mei Gu, Jian-li Zhang, Dong-jie Wang, Yue-pin Zhang, Hao-chuan Jiang, Bao-jiu Chen. White light emission from Dy³⁺-doped LiLuF₄ single crystal grown by Bridgman method. Optoelectronics Letters, 2014, 10(4): 262‒265 https://doi.org/10.1007/s11801-014-4052-4

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This work has been supported by the National Natural Science Foundation of China (Nos.51272109 and 11374044), the Natural Science Foundation of Ningbo city (No.201401A6105016), and K.C. Wong Magna Fund in Ningbo University.