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).

Highly efficient and stable Cs3Mn0.93Zn0.07Br5@SiO2 for wide color gamut backlight displays

“…Recent studies have suggested that Mn 2+ ions can be a viable alternative to Pb 2+ ions due to their unique luminescence properties, low cost, and environmental friendliness. [23][24][25][26][27][28][29][30][31][32][33][34][35] In Mn-based perovskites, the luminescence behavior of Mn 2+ is associated with the coordination environment of Mn 2+ and the distance between Mn 2+ ions. The tetrahedral structure [MnX 4 ] 2− exhibits green light emission, while the octahedral structure [MnX 6 ] 4− exhibits red light emission.…”

Solid-state synthesis of cesium manganese halide nanocrystals in glass with bright and broad red emission for white LEDs

“…21,22 Recently, manganese (Mn) halides have attracted great attention because of their low toxicity, rich earth content and low cost. [23][24][25] More importantly, the emissions of Mn 2+based metal halides can change from green to red by changing the coordination number of Mn 2+ ions. 26 Generally, Cs 3 MnX 5 shows green emission with tetrahedrally coordinated Mn 2+ ions, while CsMnX 3 exhibits wide red emission with octahedrally coordinated Mn 2+ ions.…”

Building Manganese Halide Hybrid Materials with 0D, 1D, and 2D Dimensionalities

“…Hybrid metal-halide perovskites (MHPs) have recently attracted attention due to their interesting properties that make them candidates for different applications, including, but not limited to, photovoltaics [1][2][3][4], transistors [5,6], light-emitting diodes (LEDs) [7,8], and memory devices [9,10]. These materials mostly contain three main components: a divalent cation, which is frequently lead, a nitrogen-based cation, and halide anions.…”