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Optical Spectroscopy of Pr3+ Ion Singly Doped LiLuF4 Single Crystal by Bridgman Method
Li-zhi Fang1, Xiong Zhou1, Hai-ping Xia*1, Jian-xu Hu1, Jian-li Zhang1, Bao-jiu Chen2
1.Key laboratory of Photo-electronic Materials, Ningbo University, Ningbo 315211, China;2.Department of Physics, Dalian Maritime University, Dalian 116026, China
Abstract:
High quality LiLuF4 single crystals doped with various Pr3+ ions were synthesized by a vertical Bridgman method in completely sealed platinum crucibles. The excitation spectra spans from 420 nm to 500 nm. The prepared single crystals exhibit a blue band at 480 nm (3P03H0), a green band at 522 nm (3P13H5), and a red band at 605 nm (1D23H4) when excited at 446 nm; their corresponding average lifetimes are 38.5 μs, 37.3 μs, and 36.8 μs, respectively, which are much longer than those in oxide single crystals. The effects of excitation wavelength and doping concentration on emission intensities and chromaticity coordinates are investigated. The optimal Pr3+ concentration is confirmed to be 0.5%. The temperature dependent emission shows that the emission intensity constantly decreases with the increase of temperature from 298 K to 443 K due to the enhancement of nonradiative quenching at high temperature. The 3P0→3H4 transition is the most vulnerable to temperature, followed by the 3P1→3H5 transition and 1D2→3H4 transition.
Key words:  Pr3+ ion, LiLuF4 single crystal, Optical spectroscopy
FundProject:
Pr3+离子单掺LiLuF4单晶的坩埚下降法生长及光谱性能研究
方立志1, 周 雄1, 夏海平*1, 胡建旭1, 章践立1, 陈宝玖2
1.宁波大学光电子功能材料重点实验室,宁波 315211;2.大连海事大学物理系,大连 116026
摘要:
本文应用坩埚下降法技术在全密封铂金坩埚条件下生长了不同Pr3+离子掺杂浓度的高质量LiLuF4单晶. 测定了单晶体从420 nm至500 nm的激发光谱. 在446 nm光激发下,观察到单晶体480 nm(3P03H4)蓝色发射带、522 nm(3P13H5)绿色发射及605 nm(1D23H4)的红色发射,其对应的平均寿命分别为38.5、37.3和36.8 μs. 其荧光寿命明显大于Pr3+掺杂的氧化物单晶. 同时研究了激发波长和掺杂浓度对发射强度以及色度坐标的影响. 获得最佳的Pr3+浓度为∽0.5 mol%,并分析了环境温度从298 K 到443 K变化对荧光强度的影响. 结果表明随着温度的增加,荧光强度逐步变弱,其中3P03H4(480 nm)能级跃迁受温度影响最大,其次是3P13H51D23H4.
关键词:  Pr3+离子,LiLuF4单晶,光学性能
DOI:10.1063/1674-0068/cjcp1902025
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