Shao Wenyi, Li Yang, Wang Xiang, Ouyang Xiao, Cai Jiafa, Li Chen, Ouyang Xiaoping, Wu Zhengyun, Xu Qiang
Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China.
Phys Chem Chem Phys. 2020 Apr 7;22(13):6970-6974. doi: 10.1039/c9cp06259a. Epub 2020 Mar 18.
Recently, organic-inorganic hybrid perovskites (OIHPs) are rising as promising candidates for light-emitting applications, due to their superior optical properties. High performance light-emitting applications such as scintillators require minimum non-radiative recombination and high fractions of radiative recombination. Here, we report a simple solution-processing strategy for the synthesis of funnel-type CHNH(MA)PbCl/CHNH(MA)PbBrCl heterostructure perovskite materials that improve the light emission performances. The single crystal X-ray diffraction pattern indicates that the lattice mismatch is only ∼3.24% in the heterointerface. The halide gradient is helpful for driving the photoexcited carriers from the internal high bandgap material to the low bandgap light-emitter layer. The steady-state photoluminescence (PL) and radioluminescence (RL) spectra show that the luminescence intensity has been significantly improved by this heterostructure perovskite. Time-resolved photoluminescence (TRPL) exhibits carrier transport along the halide gradient. Our research suggests that the gradient halide perovskite heterostructure with specific optical properties could be a prospect for commercial scintillator applications.
最近，有机-无机杂化钙钛矿（OIHPs）因其优异的光学性能而成为发光应用中很有前景的候选材料。诸如闪烁体等高性能发光应用需要最小的非辐射复合和高比例的辐射复合。在此，我们报道了一种简单的溶液处理策略，用于合成漏斗型CHNH（MA）PbCl/CHNH（MA）PbBrCl异质结构钙钛矿材料，该材料可改善发光性能。单晶X射线衍射图谱表明，异质界面处的晶格失配仅约为3.24%。卤化物梯度有助于将光激发载流子从内部高带隙材料驱动到低带隙发光层。稳态光致发光（PL）和辐射发光（RL）光谱表明，这种异质结构钙钛矿显著提高了发光强度。时间分辨光致发光（TRPL）显示载流子沿卤化物梯度传输。我们的研究表明，具有特定光学性质의梯度卤化物钙钛矿异质结构有望用于商业闪烁体应用。
