Enhancement of Exciton Emission in Lead Halide-Based Layered Perovskites by Cation Mixing.
Enhancement of Exciton Emission in Lead Halide-Based Layered Perovskites by Cation Mixing.
复制标题
通过阳离子混合增强卤化铅基层状钙钛矿中的激子发射。
DOI：
10.1166/jnn.2016.12295
复制
发表时间：
2016
影响因子：
--
通讯作者：
N. Sakamoto
中科院分区：
文献类型：
--
作者：
M. Era;Yumeko Komatsu;N. Sakamoto
制备卤化铅PbX：X = I和Br、具有环己烯基乙基铵分子作为有机层的层状钙钛矿的旋涂膜，其与由各种二价金属卤化物（例如，Ca 2、Cd I 2、FeI 2、SnBr 2等）组成的其它基于金属卤化物的层状钙钛矿混合。X射线衍射测量的结果表明，当采用离子半径接近Pb2+的离子半径的二价阳离子时，在混合膜样品中观察到高达50摩尔%的非常高的摩尔浓度的基于PbX的层状钙钛矿和其他基于二价金属卤化物的层状钙钛矿之间的固溶体形成。在固溶体薄膜中，激子发射在室温下得到了很大的增强。在室温下，与基于Ca 1的层状钙钛矿（20摩尔%）混合的基于Pb 1的层状钙钛矿的激子发射强度是原始的基于Pb 1的层状钙钛矿的激子发射强度的约5倍，并且与基于SnBr的层状钙钛矿（20摩尔%）混合的基于PbBr的层状钙钛矿的激子发射强度也是原始的基于PbBr的层状钙钛矿的激子发射强度的约5倍。
Spin-coated films of a lead halide, PbX: X = I and Br, layered perovskites having cyclohexenylethyl ammonium molecule as an organic layer, which were mixed with other metal halide-based layered perovskites consisting of various divalent metal halides (for example, Ca2, Cdl2, FeI2, SnBr2 and so on), were prepared. The results of X-ray diffraction measurements exhibited that solid solution formation between PbX-based layered perovskite and other divalent metal halide-based layered perovskites was observed up to very high molar concentration of 50 molar% in the mixed film samples when divalent cations having ionic radius close to that of Pb2+ were employed. In the solid solution films, the exciton emission was much enhanced at room temperature. Exciton emission intensity of Pbl-based layered perovskite mixed with Cal-based layered perovskite (20 molar%) is about 5 times large that of the pristine Pbl-based layered perovskite, and that of PbBr-based layered perovskite mixed with SnBr-based layered perovskite (20 molar%) was also about 5 times large that of the pristine PbBr-based layered perovskite at room temperature.