Xu Yingzhuang, Li Junzi, Zhao Fuli, Gao Yang, Chen Rui, He Tingchao
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055 P. R. China.
ACS Omega. 2022 Aug 10;7(33):29415-29419. doi: 10.1021/acsomega.2c03661. eCollection 2022 Aug 23.
Lead-free perovskite materials with good stability are promising for various applications. In order to explore their application in optoelectronic devices, it is essential to investigate their fundamental optical properties. In this work, we have synthesized a CsMnBr single crystal (SC) with red emission at ∼621 nm and studied their optical properties. Through the measurement of temperature-dependent photoluminescence (PL) spectra, it is found that a phase transition occurs at approximately 100 K in the SC, which is absent in the CsMnBr nanocrystals (NCs). Furthermore, the SC exhibits stronger electron and longitudinal optical phonon coupling strength than that of the NCs at low temperatures. In addition, under the resonant excitation at 600 nm, the SC possesses strong saturable absorption property, with a modulation depth of ∼27%. Interestingly, the SC also exhibits a large two-photon absorption coefficient of ∼0.035 cm GW at 800 nm and an excellent optical limiting behavior. The experimental results indicate that the CsMnBr SC is a class of excellent environmentally friendly optoelectronic materials.
具有良好稳定性的无铅钙钛矿材料在各种应用中具有广阔前景。为了探索它们在光电器件中的应用，研究其基本光学性质至关重要。在这项工作中，我们合成了一种在约621 nm处发出红色光的CsMnBr单晶（SC），并研究了其光学性质。通过测量温度相关的光致发光（PL）光谱，发现该单晶在约100 K时发生相变，而CsMnBr纳米晶体（NCs）中不存在这种相变。此外，在低温下，该单晶表现出比纳米晶体更强的电子与纵向光学声子耦合强度。另外，在600 nm的共振激发下，该单晶具有强饱和吸收特性，调制深度约为27%。有趣的是，该单晶在800 nm处还表现出约0.035 cm GW的大二阶光子吸收系数和优异的光限幅行为。实验结果表明，CsMnBr单晶是一类优异的环保光电子材料。
