铕卤钙钛矿发光材料的溶液法制备及光物理性质表征  

A Facile Method for Preparing Europium Halide Perovskite and Its Photophysical Characterization

作　　者：禹钢 赵子丰 顾飞丹 郑南龙 刘志伟[1] 卞祖强[1] 黄春辉[1] Yu Gang;Zhao Zifeng;Gu Feidan;Zheng Nanlong;Liu Zhiwei;Bian Zuqiang;Huang Chunhui(Beijing National Laboratory for Molecular Sciences,State Key Laboratory of Rare Earth Materials Chemistry and Applications,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China)

机构地区：[1]北京大学化学与分子工程学院,北京分子科学国家研究中心,北京大学稀土材料化学及应用国家重点实验室,北京100871

出　　处：《中国稀土学报》2023年第1期152-158,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家重点研发计划项目(2021YFB3501800);国家自然科学基金项目(62104013)资助。

摘　　要：铕卤钙钛矿具有独特的光物理性质。文献报道的铕卤钙钛矿的合成方法有热固相反应、热注入法和真空共蒸镀法,鲜有溶液法报道。本工作采用一步溶液法制备了纯相的甲胺溴化铕MAEuBr_(3)(MA=CH_(3)NH_(3)^(+))钙钛矿薄膜,并表征了其结构及光物理性质。X射线衍射结果验证了该薄膜为立方钙钛矿相,扫描电镜结果表明该材料在导电玻璃基底表面为分散的亚微米尺度的微晶。该材料展现出主峰位于429 nm,半峰宽仅为24 nm的蓝紫色单峰发射,光致发光量子效率为8%,源于Eu^(2+)中心离子的d-f跃迁发射。通过进一步变温光谱表征可推断出该材料的激子结合能约为12 meV。通过LiBr共掺手段,薄膜的光致发光量子效率可以提升至20%。Europium halide perovskite is a special luminescent material with potential to replace lead-based perovskite owing to its hypotoxicity,especially as blue-emitting material.In the past few decades,thermal solidphase reaction,hot-injection and vacuum deposition have been reported as the approach to obtain solid,nanoparticles or films of europium halide perovskite.In this work,a one-step solution process is proposed to fabricate MAEuBr_(3)perovskite of pure phase,and the structural and photophysical properties of the perovskite were further explored.MAEuBr_(3)crystalizes as cubic structure according to X-ray diffraction,in the form of submicrometre-scale crystallines were revealed by scanning electron microscope.The film exhibits a violet blue emission peaking at 429 nm,with a FWHM(full width at half maximum)of 24 nm and PLQY of 8%,which originates from the d-f transitions of central Eu^(2+)ions.The exciton binding energy is estimated to be 12 meV according to the temperature-dependent photoluminescence spectra.The PLQYs of the perovskite films can be promoted up to 20%by doping MAEuBr_(3)with LiBr.

关 键 词：钙钛矿 铕 发光材料 蓝紫光 

分 类 号：O482.31[理学—固体物理]