【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（³P₀→³H₄）蓝色发射带、522 nm（³P₁→³H₅）绿色发射及605nm（¹D₂→³H₄）的红色发射,其对应的平均寿命分别为38.5、37.3和36.8μs.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³p₀→³H₄（480 nm）能级跃迁受温度影响最大,其次是³p₁→³H₅和¹D₂→³H₄.更多还原

【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（³P₀→³H₄）, a green band at 522 nm （³P₁→³H₅）, and a red band at 605 nm （¹D₂→³H₄）when excited at 446 nm; their corresponding average lifetimes are 38.5μs, 37.3μs, and 36.8μs, 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.更多还原