Lead-free all-inorganic halide materials with different Mn-based crystal structures (CsMnBr and CsMnBr) were obtained using a convenient synthetic method. CsMnBr had a bright green emission (522 nm), with a unique single-exponential lifetime (τ = 236 µs) and a high photoluminescence quantum yield (82 ± 5%). A red emission was observed in the case of the CsMnBr 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 CsMnBr/CsMnBr 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 CsMnBr/CsMnBr with a commercial UV LED chip (365 nm).
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| http://dx.doi.org/10.3390/molecules27238259 | DOI Listing |
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