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Facile Synthesis of Highly Emissive All-Inorganic Manganese Bromide Compounds with Perovskite-Related Structures for White LEDs.

ABSTRACT: Lead-free all-inorganic halide materials with different Mn2+-based crystal structures (Cs3MnBr5 and CsMnBr3) were obtained using a convenient synthetic method. Cs3MnBr5 had a bright green emission (522 nm), with a unique single-exponential lifetime (τavg = 236 µs) and a high photoluminescence quantum yield (82 ± 5%). A red emission was observed in the case of the CsMnBr3 structure with a two-exponential fluorescence decay curve, and the lifetime was 1.418 µs (93%) and 18.328 µs (7%), respectively. By a judicious tuning of the synthetic conditions, a mixed phase of Cs3MnBr5/CsMnBr3 was also produced that emitted white light, covering almost the entire visible spectrum. White-light-emitting diodes (WLEDs) with color coordinates (0.4269, 0.4955), a color temperature of (3773 K), and a color rendering index (68) were then fabricated using the as-prepared powder of mixed phases of Cs3MnBr5/CsMnBr3 with a commercial UV LED chip (365 nm).

SUBMITTER: Gao P 

PROVIDER: S-EPMC9736304 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature

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Facile Synthesis of Highly Emissive All-Inorganic Manganese Bromide Compounds with Perovskite-Related Structures for White LEDs.

Gao Ping P   Cheng Suwen S   Liu Jiaxin J   Li Junjie J   Guo Yanyan Y   Deng Zhengtao Z   Qin Tianshi T   Wang Aifei A  

Molecules (Basel, Switzerland) 20221126 23

Lead-free all-inorganic halide materials with different Mn<sup>2+</sup>-based crystal structures (Cs<sub>3</sub>MnBr<sub>5</sub> and CsMnBr<sub>3</sub>) were obtained using a convenient synthetic method. Cs<sub>3</sub>MnBr<sub>5</sub> had a bright green emission (522 nm), with a unique single-exponential lifetime (τ<sub>avg</sub> = 236 µs) and a high photoluminescence quantum yield (82 ± 5%). A red emission was observed in the case of the CsMnBr<sub>3</sub> structure with a two-exponential fluor  ...[more]

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