Formation of a Stable Guanidinium-Formamidinium Phase in Bismuth Chloride Perovskites with Broadband Emission
Formation of a Stable Guanidinium-Formamidinium Phase in Bismuth Chloride Perovskites with Broadband Emission
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在具有宽带发射的氯化铋钙钛矿中形成稳定的胍-甲脒相
DOI：
10.1021/acs.chemmater.1c00231
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发表时间：
2021
影响因子：
8.6
通讯作者：
He Yunbin
中科院分区：
文献类型：
--
作者：
Xu Yaxin;Chai Xingchen;Yang Wantian;Hu Jiarui;Chen Junnian;He Yunbin
无铅的零维（0 D）混合铋卤化物钙钛矿由于其有前途的发射性能和良好的化学稳定性引起了人们极大的兴趣。在此，我们报告了混合阳离子相0 D胍-甲脒氯化铋，[C（NH 2）3]2[CH（NH 2）2] 3Bi 2Cl 11（表示为Gua 2FA 3Bi 2Cl 11）的设计和合成，其中单个角共享[Bi 2Cl 11]5-二聚体被完全隔离并被混合的Gua+和FA+有机阳离子包围。Gua 2FA 3Bi 2Cl 11中的角共享连接模式与原始Gua 3BiCl 6中的角共享连接模式不同，具有隔离的[BiCl 6]3单元。重要的是，Gua 2FA 3Bi 2Cl 11产生了从350到750 nm的显著宽带发射，不同于原始的Gua 3BiCl 6，显示出明显的窄带发射。进一步的电子物理性质的研究表明，宽带发射有贡献的自由激子和自陷激子。此外，Gua 2FA 3Bi 2Cl 11不仅在连续高功率紫外灯照射下70 min内表现出优异的光稳定性，而且在环境条件下湿度稳定超过6个月。这一发现为开发生态友好和稳定的0 D钙钛矿宽带发射器提供了一种新的分子工程策略。
Lead-free zero-dimensional (0D) hybrid bismuth halide perovskites have aroused great interest due to their promising emission properties and good chemical stability. Herein, we report the design and synthesis of mixed-cation-phase 0D guanidinium–formamidinium bismuth chloride, [C(NH2)3]2[CH(NH2)2]3Bi2Cl11(denoted as Gua2FA3Bi2Cl11), where an individual corner-sharing [Bi2Cl11]5–dimer is completely isolated and surrounded by the mixed Gua+and FA+organic cations. The corner-sharing connectivity mode in Gua2FA3Bi2Cl11differs from that in pristine Gua3BiCl6, featuring an isolated [BiCl6]3–unit. Importantly, Gua2FA3Bi2Cl11yields remarkable broadband emission spanning from 350 to 750 nm, different from the pristine Gua3BiCl6, showing distinct narrowband emission. Further investigation of photophysical properties reveals that the broadband emission has contributions from both free excitons and self-trapped excitons. Moreover, Gua2FA3Bi2Cl11not only exhibits excellent photostability under continuous high-power UV lamp irradiation during 70 min but also is humidity stable for over 6 months under ambient conditions. This finding presents a novel molecular engineering strategy for the development of eco-friendly and stable 0D perovskite broadband emitters.