Hu Haoyang, Xia Haiping, Wang Peiyuan, Peng Jiangtao, Zhang Yuepin, Jiang Haochuan, Chen Baojiu
J Nanosci Nanotechnol. 2016 Jan;16(1):526-31. doi: 10.1166/jnn.2016.10802.
Yttrium lithium fluoride (LiYF₄) single crystals triply doped with Er³⁺/Tm³⁺/Ho³⁺ are synthesized by a vertical Bridgman method. Absorption spectra, emission spectra, and decay curves are measured to investigate the luminescent properties of the crystals. Compared with Er³⁺ singly doped and Er³⁺/Tm³⁺ and Er³⁺/Ho³⁺ doubly doped LiYF₄ crystals, an intense emission around 2.7 µm can be obtained in the triply doped LiYF4 crystal under excitation of 980 nm laser diode. Meanwhile, the near infrared emission at 1.5 µm from Er³⁺ in the triply doped crystal is effectively reduced. The possible energy transfer processes and the luminescent mechanisms for enhancing emission at 2.7 µm and quenching emission at 1.5 µm in the Er³⁺/Ho³⁺/Tm³⁺ triply doped crystals are proposed. The large energy transfer efficiency of 82.0% and excellent optical transmission indicate that this Er³⁺/Tm³⁺/Ho³⁺ triply doped crystal can be considered as a promising material for a mid- infrared laser at 2.7 µm.
采用垂直布里奇曼法合成了掺Er³⁺/Tm³⁺/Ho³⁺的钇锂氟化物（LiYF₄）单晶。测量了吸收光谱、发射光谱和衰减曲线以研究晶体的发光特性。与单掺Er³⁺以及双掺Er³⁺/Tm³⁺和Er³⁺/Ho³⁺的LiYF₄晶体相比，在980 nm激光二极管激发下，三掺LiYF₄晶体可获得2.7 µm左右的强发射。同时，三掺晶体中Er³⁺在1.5 µm处的近红外发射有效降低。提出了三掺Er³⁺/Ho³⁺/Tm³⁺晶体中增强2.7 µm发射和猝灭1.5 µm发射的可能能量转移过程和发光机制。82.0%的高能量转移效率和优异的光学透过率表明，这种三掺Er³⁺/Tm³⁺/Ho³⁺晶体有望成为2.7 µm中红外激光器的材料。
