Enantiomorphic Single Crystals of Linear Lead(II) Bromide Perovskitoids with White Circularly Polarized Emission

Chiroptical hybrid organic–inorganic perovskites are emerging as a new class of promising materials with mirror optical signal responses for optoelectronic applications. However, chiroptical white‐emission materials have been scarcely unearthed. Herein, four pairs of hybrid lead(II) bromide perovski...

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Veröffentlicht in:Angewandte Chemie 2022-07, Vol.134 (30), p.n/a
Hauptverfasser: Jin, Kai‐Hang, Zhang, Yue, Li, Kai‐Jie, Sun, Meng‐En, Dong, Xi‐Yan, Wang, Qing‐Lun, Zang, Shuang‐Quan
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Sprache:eng
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Zusammenfassung:Chiroptical hybrid organic–inorganic perovskites are emerging as a new class of promising materials with mirror optical signal responses for optoelectronic applications. However, chiroptical white‐emission materials have been scarcely unearthed. Herein, four pairs of hybrid lead(II) bromide perovskitoids were obtained, namely, (R)‐ and (S)‐(H2MPz)PbBr4 (R/S‐MPz=(R)‐(−)/(S)‐(+)‐2‐methylpiperazine) (1 and 2), (R)‐ and (S)‐(H2MPz)3Pb2Br10⋅2 DMAc (3 and 4), (R)‐ and (S)‐(H2MPz)PbBr4⋅0.5 MeCN (5 and 6) and (R)‐ and (S)‐(H2MPz)2Pb2Br8⋅DCM (7 and 8). Notably, they all exhibit ultrabroadband emission and chiroptical signals. Perovskitoids 3–6 even achieve white circularly polarized emission with a high dissymmetric factor (glum) (±3×10−3 for 3 and 4; ±8×10−3 for 5 and 6). This new type of hybrid perovskitoids will attract attention and find applications in chiroptical fields because of the extensively and easily tunable photophysical properties. White circularly polarized emission based on lead(II) bromide perovskitoids was successfully achieved. The emission results from the synergistic combination of chiral organic cations and lead bromide inorganic anions. The chiral lead(II) bromide perovskitoids are obtained through a concise synthesis process, and they show excellent white‐emission photoluminescence quantum yields and ultrastable persistence in ambient conditions.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.202205317