大尺寸高质量CsCu_(2)I_(3)晶体生长与发光性能研究  

Growth and Luminescence Properties of Large Size and High Quality CsCu_(2)I_(3)Crystals

作　　者：陈鑫鑫 韩佳力 潘建国[1,2] CHEN Xinxin;HAN Jiali;PAN Jianguo(School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China;Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province,Ningbo 315211,China)

机构地区：[1]宁波大学材料科学与化学工程学院,宁波315211 [2]浙江省光电探测材料及器件重点实验室,宁波315211

出　　处：《人工晶体学报》2024年第7期1106-1111,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(12375180,61775108)。

摘　　要：全无机CsCu_(2)I_(3)晶体属于正交晶系,空间群为Cmcm,具有一维钙钛矿结构,有望在光电器件方面获得广泛应用。本文采用重结晶提纯后的CuI为原料,通过垂直坩埚下降法生长得到1英寸(1英寸=2.54 cm)透明高质量CsCu_(2)I_(3)单晶。利用X射线粉末衍射和热重分析研究了该晶体的物相和稳定性;通过紫外可见透过光谱、光致发光光谱、荧光寿命和荧光量子产率等表征手段研究了该晶体的发光性能。此外,还测量了100~250 K条件下的变温荧光,发现随温度升高,电子-声子的耦合增强,导致光致发光强度下降,晶体的激子结合能E_(b)为98.12 meV。研究表明CsCu_(2)I_(3)晶体具有良好的光学性能。The all-inorganic CsCu_(2)I_(3)crystal was characterized by one-dimensional perovskite structure with orthorhombic crystal system and Cmcm space group,which was expected to be widely used in optoelectronic devices.In this paper,a transparent and high-quality CsCu_(2)I_(3)single crystal with diameter of 1 inch(1 inch=2.54 cm)was grown by vertical Bridgman method,employing recrystallized CuI as the raw material.The phase structure and stability of the crystal were investigated by means of X-ray powder diffraction and thermogravimetric analysis.The optical and luminescence performance of the crystal was studied by means of ultraviolet-visible transmission spectroscopy,photoluminescence spectroscopy,fluorescence lifetime and fluorescence quantum yield.In addition,the variable temperature fluorescence spectra were measured at 100~250 K.The photoluminescence intensity decreases with increasing temperature due to strong electro-phonon coupling.The exciton binding energy(E_(b))of the crystal is 98.12 meV.The study shows that the CsCu_(2)I_(3)crystal exhibits good optical properties.

关 键 词：钙钛矿 CsCu_(2)I_(3)晶体 重结晶提纯 坩埚下降法 荧光光谱 衰减时间 变温荧光光谱 

分 类 号：O782[理学—晶体学]