Predictably synthesizing a library of white-light-emitting perovskites

Predictably synthesizing a library of white-light-emitting perovskites
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可预测地合成白光发射钙钛矿库

DOI:
10.1007/s11426-022-1513-8
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发表时间:
2023-01
期刊:
Science China Chemistry
影响因子:
--
通讯作者:
Xing Jun
Xing Jun
中科院分区:
其他
文献类型:
--
作者:
Niu Ludan;Zhao Lili;Li Deyu;Chen Qian;Zhang Mingming;Luan Jing;Wang Lei;Xu Weigao;Xing Jun

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具有自捕获激子发射特性的低维有机-无机卤化物钙钛矿作为单相白光发射体具有广阔的应用前景。然而,到目前为止,这些宽带白光(BWLE)钙钛矿是通过反复测试间隔分子来合成的。在这里,我们开发了一种空间位阻调节策略来预测合成BWLE钙钛矿。将含有C-C (-NH2) -C基团的分子引入低维钙钛矿中,使其面内取向具有较大的位阻。C-C (-NH2) -C键角越大,钙钛矿结构畸变越大,激子自俘获率越高,自俘获深度越深。合成的钙钛矿的光致发光光谱覆盖了冷-暖白光区域。根据这一策略,我们构建了一个包含40种BWLE化合物的材料库。我们的发现开发了一种合成BWLE钙钛矿的一般策略,并为光电应用提供了一个材料平台。
The low-dimensional organic-inorganic halide perovskites with self-trapped exciton emission have promising prospects for single-phase white-light emitters. However, so far, these broadband white-light-emitting (BWLE) perovskites were synthesized by trial-and-error testing spacing molecules. Here, we developed a steric hindrance regulation strategy to predictably synthesize BWLE perovskites. The molecules containing C–C(–NH2)–C groups were introduced into low-dimensional perovskites, which brings a large steric hindrance in-plane orientation. The bigger C–C(–NH2)–C bond angle would induce larger structural distortion in perovskites, which leads to the higher rate of self-trapping of excitons and the deeper self-trapping depth. The photoluminescence spectra of the synthesized perovskites can cover the cool-to-warm white light region. Overall, we fabricated a material library consisting of 40 kinds of BWLE compounds according to this strategy. Our findings develop a general strategy to synthesize BWLE perovskites and offer a material platform for optoelectronic applications.
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