人工晶体学报2021，Vol.50Issue(8)：1402-1407,1421,7.
K2LaBr5:Pr晶体的生长及发光性能研究
Growth and Luminescence Properties of K2 LaBr5:Pr Crystal
摘要
Abstract
K2LaBr5 polycrystalline materials with different doping concentrations of Pr3+ were synthesized by high-temperature solid-state method, and the K2LaBr5:Pr single crystals were grown by vertical Bridgman technique, and cylindrical transparent crystals with ?12 mm × 5 mm Were obtained by a series of processing. The crystal belongs to the orthogonality system and the cell parameters has been determined as a=1.336 0 nm，h=0.992 7 nm, c=0.846 2 nm , Z=4，the crystal density is 3.908 g/cm3，the melting point is 607℃. The crystals were characterized by powder X-ray diffraction, X-ray excitation emission spectrum, photoluminescence spectrum, transmittance and so on. Under the excitation of ultraviolet light and X-ray, the K2LaBr5:Pr crystal exhibits blue light (3P1→3H4)，green fight (3P0→3H4,3P1→3H5)，orange light (3P1→3H6,3P1→3F2)，red light (3P0→3F2,3P1→3F3)，deep red light (3P1→3F4)，purple light(3P0→3F4) and other visible wavelengths of light output in the wavelength range of 480 nm to 750 nm, which indicates that the crystal has excellent luminescent properties. Under X-ray excitation, a broadband 4f 5d-4f2 emission transition is also observed in the range of 360 nm to 440 nm. The scintillation decay time of K2 LaBr5:Pr crystal is about 10 μs，which is measured by the steady-state transient fluorescence spectrophototmeter, and the transmittance of the crystal in the visible range is 88% measured by the ultraviolet-visible spectrophototmeter.关键词
稀土卤化物/K2LaBr5:Pr/坩埚下降法/光致发光/衰减时间Key words
rare earth halide/K2LaBr5:Pr/Bridgman technique/photoluminescence/decay time分类
数理科学引用本文复制引用
熊建辉,王昊宇,杨晨乐,潘尚可,陈红兵,潘建国..K2LaBr5:Pr晶体的生长及发光性能研究[J].人工晶体学报,2021,50(8):1402-1407,1421,7.基金项目
国家自然科学基金(61775108,61875096) （61775108,61875096）
