大尺寸高质量CsCu2I3晶体生长与发光性能研究OA北大核心CSTPCD
Growth and Luminescence Properties of Large Size and High Quality CsCu2I3 Crystals
全无机CsCu2I3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CsCu2I3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Eb为98.12 meV.研究表明CsCu2I3晶体具有良好的光学性能.
The all-inorganic CsCu2 I3 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 CsCu213 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(Eb)of the crystal is 98.12 meV.The study shows that the CsCu2I3 crystal exhibits good optical properties.
陈鑫鑫;韩佳力;潘建国
宁波大学材料科学与化学工程学院,宁波 315211||浙江省光电探测材料及器件重点实验室,宁波 315211
钙钛矿CsCu2I3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
perovskiteCsCu2I3 crystalrecrystallization purificationBridgman methodfluorescence spectrumdecay timevariable temperature fluorescence spectrum
《人工晶体学报》 2024 (007)
1106-1111 / 6
国家自然科学基金(12375180,61775108)
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