铈掺杂硼酸钙镧晶体的生长与性能研究  

Growth and Property of Ce^(3+)-doped La2CaB10O19 Crystal

作　　者：李悦 张旭良 景芳丽 胡章贵 吴以成 LI Yue;ZHANG Xuliang;JING Fangli;HU Zhanggui;WU Yicheng(Tianjin Key Laboratory of Functional Crystal Materials,Institute of Functional Crystals,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China)

机构地区：[1]天津理工大学材料科学与工程学院,功能晶体研究院,天津市功能晶体材料重点实验室,天津300384

出　　处：《无机材料学报》2023年第5期583-588,共6页Journal of Inorganic Materials

基　　金：National Natural Science Foundation of China (92163207, 51872198, 51890860, 51890865)。

摘　　要：硼酸钙镧晶体是一种激光基质晶体,以其优秀的物理特性而受到广泛关注。稀土离子掺杂的硼酸钙镧晶体在紫外激光器领域的研究尚不多见。本研究采用顶部籽晶法成功生长出尺寸为40 mm×21 mm×6 mm的铈掺杂硼酸钙镧晶体。研究了铈掺杂硼酸钙镧晶体室温光谱性质,测量了室温下其透过光谱以及紫外-吸收光谱,发现铈离子掺杂导致晶体在200~288 nm以及305~330 nm紫外波段吸收较强。测试了室温下铈掺杂硼酸钙镧晶体的激发光谱,并且利用波长260 nm的连续光激发得到发射光谱,发现主要发射带中心波长位于290,304,331和353 nm处,对应于铈离子5d态到~2F_(5/2)和~2F_(7/2)态的跃迁。对铈掺杂硼酸钙镧晶体的热学性质进行了研究,发现其在300 K下具有较高的热导率(6.45 W/(m·K)),且随着温度升高保持良好的热稳定性。358 K条件下,热膨胀系数及c方向的晶格常数分别为2.94×10^(–6)/K和0.91240 nm,随着温度升高至773 K,线性增加到5.3×10^(–5)/K和0.91246 nm。研究结果表明:铈掺杂硼酸钙镧晶体具有良好的光学性能和热稳定性,适合应用于紫外激光领域。Besides its application as nonlinear optical devices,La2CaB10O19(LCB)crystal has been extensively studied as a host crystal due to excellent properties.Nevertheless,rare-earth(RE)ions doped LCB crystals for ultraviolet(UV)lasers have not been studied yet.In this work,Ce^(3+)doped La2CaB10O19(Ce^(3+):LCB)crystal with the size of 40 mm×21 mm×6 mm was grown by top-seeded solution growth(TSSG)method.Its lattice parameters are slightly different from that of the LCB crystal,and its X-ray rocking curve indicates that the Ce^(3+):LCB is of high crystalline quality.Transmittance spectrum and UV absorption spectrum measured at room temperature show intense absorption in the ranges of 200-288 nm and 305-330 nm,and Sellmeier equations for the refractive indices were determined by least-squares method.The excitation and fluorescence spectra show that there are two broad excitation peaks at 280 nm and 316 nm,corresponding to transitions of Ce^(3+)ions from 4f to 5d.Four emission peaks were obtained at 290,304,331,and 355 nm,which correspond to transitions from 5d state to 2F5/2 state and 2F7/2 state.Ce^(3+):LCB crystal exhibits high thermal conductivity(6.45 W/(m·K))at 300 K,and keeps good thermal stability with the increase of temperatures.Its thermal expansion coefficients and lattice parameters of c direction linearly enlarge from 2.94×10^(–6)/K and 0.91240 nm to 5.3×10^(–5)/K and 0.91246 nm in the temperature range from 358 K to 773 K,respectively.These results demonstrate that Ce^(3+):LCB crystal has excellent optical properties and good thermal stability,which is conducive to its application for UV lasers.

关 键 词：铈掺杂硼酸钙镧晶体 光学性能 热稳定性 

分 类 号：O78[理学—晶体学]