Wang Jun, Fang Chen, Ma Jiaqi, Wang Shuai, Jin Long, Li Wancai, Li Dehui
School of Optical and Electronic Information , Huazhong University of Science and Technology , Wuhan , 430074 , China.
Wuhan National Laboratory for Optoelectronics , Huazhong University of Science and Technology , Wuhan , 430074 , China.
ACS Nano. 2019 Aug 27;13(8):9473-9481. doi: 10.1021/acsnano.9b04437. Epub 2019 Aug 7.
Low-dimensional lead halide perovskite materials are an emerging class of solution-processable semiconductors with promising potential applications in optoelectronic devices. Unfortunately, it is impossible to synthesize high-crystalline-quality low-dimensional perovskite single crystals without using chemotoxic solutions such as dimethylformamide/dimethyl sulfoxide or applying heating. Herein we report an economical and universal aqueous method to synthesize 2D layered and 1D chain perovskite single crystals at room temperature. The resultant chiral 2D perovskites can efficiently and selectively emit and detect circularly polarized light at room temperature. The as-synthesized 1D perovskite single crystals exhibit strong quantum confinement and enhanced self-trapped states that give efficient warm circularly polarized white-light emission. This aqueous synthetic method is general for other high-quality low-dimensional lead halide perovskite single crystals, and thus our findings would motivate more fundamental investigations on low-dimensional perovskites for potential optoelectronic applications.
低维铅卤化物钙钛矿材料是一类新兴的可溶液加工半导体，在光电器件中具有广阔的潜在应用前景。不幸的是，不使用化学毒性溶液（如二甲基甲酰胺/二甲基亚砜）或不进行加热，就无法合成高结晶质量的低维钙钛矿单晶。在此，我们报道了一种经济通用的水相方法，可在室温下合成二维层状和一维链状钙钛矿单晶。所得的手性二维钙钛矿在室温下能够高效且选择性地发射和检测圆偏振光。合成的一维钙钛矿单晶表现出强烈的量子限制和增强的自陷态，从而产生高效的热圆偏振白光发射。这种水相合成方法对于其他高质量的低维铅卤化物钙钛矿单晶具有通用性，因此我们的发现将推动对低维钙钛矿进行更多潜在光电子应用的基础研究。
