摘要
近年来,铜基钙钛矿因其出色的稳定性和环境友好性在发光和闪烁等领域受到了广泛关注。然而,目前对CsCu_(2)I_(3)晶体材料的研究主要集中在0维和1维领域,这限制了人们对材料本征性质和各向异性的深入理解,也限制了其在闪烁体中的实际应用。本文通过溶液降温法开展了CsCu_(2)I_(3)体块单晶的生长工艺研究,成功得到了长度达5 mm的高质量CsCu_(2)I_(3)单晶,该晶体无色透明、棱角分明、显露面完整。XRD测试结果表明,CsCu_(2)I_(3)晶体在经过6个月后依然保持了良好的稳定性;吸收光谱显示该晶体在310 nm波段具有明显的吸收峰,计算得到其禁带宽度为3.42 eV,表明CsCu_(2)I_(3)晶体属于宽禁带半导体;发射光谱显示该晶体发射波长位于580 nm处,半峰全宽为75 nm,绘制CIE色度图得到其发光色度坐标为(0.47,0.50),位于黄光区域,属于暖白色调(色温3000 K),这与该晶体在紫外灯照射下发出黄色荧光的现象一致;CsCu_(2)I_(3)晶体的荧光寿命测得为51.6和215.5 ns。
In recent years,copper-based perovskite has attracted widespread attention in the field of light emission and scintillation due to its excellent stability and environmental friendliness.However,most researches were focused on the 0D and 1D CsCu_(2)I_(3)crystals,which limit the understanding for the intrinsic properties and anisotropy,as well as the practical application in scintillators.In this paper,a high-quality CsCu_(2)I_(3)crystal with length of 5 mm was successfully grown by the solution cooling method.The crystal presents a transparent colorless appearance,with distinct edges and exposed facets.XRD results indicate that the CsCu_(2)I_(3)crystal maintains good stability even after 6 months.The absorption spectrum shows an absorption peak of CsCu_(2)I_(3)crystal at 310 nm.The band gap width is calculated to be 3.42 eV,indicating that the CsCu_(2)I_(3)crystal is a wide-bandgap semiconductor.The emission wavelength of CsCu_(2)I_(3)crystal is located at 580 nm,with full width at half maximum(FWHM)of 75 nm.The luminous chromaticity of the CsCu_(2)I_(3)crystal falls at coordinates(0.47,0.50)in the yellow region on the CIE chromaticity diagram,belonging to a warm white tone with color temperature of 3000 K.It is consistent with its yellow emission of the CsCu_(2)I_(3)crystal under the ultraviolet lamp.The fluorescence lifetime of the CsCu_(2)I_(3)crystal is measured to be 51.6 and 215.5 ns.
作者
凌昊
徐乐
陈思贤
唐远之
孙海滨
郭学
冯玉润
胡强强
LING Hao;XU Le;CHEN Sixian;TANG Yuanzhi;SUN Haibin;GUO Xue;FENG Yurun;HU Qiangqiang(School of Materials Science and Engineering,Shandong University of Technology,Zibo 255049,China)
出处
《人工晶体学报》
CAS
北大核心
2024年第7期1121-1126,共6页
Journal of Synthetic Crystals
基金
国家自然科学基金(62105189)
山东省高等学校青创科技支持计划(2022KJ231)。
