Huang Xuan, Tang Xiaobing, Wen Xiyu, Lu Yuebin Charles, Yang Fuqian
Laboratory of Functional Materials, University of Kentucky, Lexington, KY 40506, USA.
Department of Mechanical and Aerospace Engineering, University of Kentucky, Lexington, KY 40506, USA.
Materials (Basel). 2024 Jul 19;17(14):3577. doi: 10.3390/ma17143577.
Lead toxicity has hindered the wide applications of lead halide perovskites in optoelectronics and bioimaging. A significant amount of effort has been made to synthesize lead-free halide perovskites as alternatives to lead halide perovskites. In this work, we demonstrate the feasibility of synthesizing CsSnI-based powders mechanochemically with dual light emissions under ambient conditions from CsI and SnI powders. The formed CsSnI-based powders are divided into CsSnI-dominated powders and CsSnI-contained powders. Under the excitation of ultraviolet light of 365 nm in wavelength, the CsSnI-dominated powders emit green light with a wavelength centered at 540 nm, and the CsSnI-contained powders emit orange light with a wavelength centered at 608 nm. Both the CsSnI-dominated and CsSnI-contained powders exhibit infrared emission with the peak emission wavelengths centered at 916 nm and 925 nm, respectively, under a laser of 785 nm in wavelength. From the absorbance spectra, we obtain bandgaps of 2.32 eV and 2.08 eV for the CsSnI-dominated and CsSnI-contained powders, respectively. The CsSnI-contained powders exhibit the characteristics of thermal quenching and photoelectrical response under white light.
铅毒性阻碍了卤化铅钙钛矿在光电子学和生物成像领域的广泛应用。人们已经付出了巨大努力来合成无铅卤化钙钛矿，以替代卤化铅钙钛矿。在这项工作中，我们展示了在环境条件下，通过机械化学方法由碘化铯（CsI）和碘化锡（SnI）粉末合成具有双发光特性的基于CsSnI的粉末的可行性。所形成的基于CsSnI的粉末分为以CsSnI为主的粉末和含CsSnI的粉末。在波长为365 nm的紫外光激发下，以CsSnI为主的粉末发出中心波长为540 nm的绿光，含CsSnI的粉末发出中心波长为608 nm的橙光。在波长为785 nm的激光照射下，以CsSnI为主的粉末和含CsSnI的粉末均表现出红外发射，其峰值发射波长分别为916 nm和925 nm。从吸收光谱中，我们分别得到以CsSnI为主的粉末和含CsSnI的粉末的带隙为2.32 eV和2.08 eV。含CsSnI的粉末在白光下表现出热猝灭和光电响应特性。
