Luminescence Change from Orange to Blue for Zero‐Dimensional Cs₂InCl₅(H₂O) Metal Halides in Water and a New Post‐doping Method

Abstract

Zero‐dimensional metal halides have attracted much attention due to their attractive photoelectric properties. Here, we propose a new strategy of synthesizing metal halides crystals by recrystallization in water. The as‐synthesized Cs2InCl5(H2O)‐orange crystals are dissolved and recrystallized in water (Cs2InCl5(H2O)‐blue), with its photoluminescence (PL) changing from orange to blue, both of which are derived from self‐trapping excitons (STEs). The time‐resolved photoluminescence (TRPL) spectrum of Cs2InCl5(H2O)‐blue shows that it has an ultralong lifetime up to milliseconds (τ=52.98 ms), which is expected to be applied in biological sensors. The photoluminescence quantum yield (PLQY) increases from 2.25% to 11.61% in the self‐assembly process. By using a post‐doping method, the PL of crystals turns into red when we introduce Mn2+ as dopant while there is no obvious change upon using a traditional solvent‐thermal method. Recrystallization in water and post‐doping provide a new perspective for the synthesis and doping of metal halides.

Organic–Inorganic Hybrid Cuprous‐Based Metal Halides for Warm White Light‐Emitting Diodes

“…Besides, indium belongs to costly rare earth element, which hampers widespread employment of these materials. [ 6 , 9 , 10 , 11 ] 0D tin (Sn)‐halide perovskites are also commonly studied as potential warm white‐light emitters, yet significant challenges remain as Sn 2+ can be easily oxidized to Sn 4+ upon air exposure. [ 12 , 13 ] In recent years, cuprous (Cu + )‐based metal halides have received extensive attention in the research field of luminescence because they are nontoxic, earth‐abundant, and intrinsically highly emissive without the aid of any sophisticated doping.…”

Admirable stability achieved by ns2ions Co-doping for all-inorganic metal halides towards optical anti-counterfeiting

“…18–21 For the fact that lower dimensionality seems more probable to lead octahedral distortion and STEs formation, attempts on lower dimensional metal halides is increasing rapidly in this era of intense scientific research, especially for 0 dimensional metal halides. 22–25…”

“…[18][19][20][21] For the fact that lower dimensionality seems more probable to lead octahedral distortion and STEs formation, attempts on lower dimensional metal halides is increasing rapidly in this era of intense scien-tic research, especially for 0 dimensional metal halides. [22][23][24][25] Cs 2 SnX 6 (X = Cl, Br, I) nanocrystals have been investigated for its tunable light emission and photocatalytic activity. [26][27][28][29][30][31] What's more, mixed halide Cs 2 SnCl 6−x Br x single crystals have been successfully applied into narrowband photodetection.…”

Synthetic-Method-Dependent Antimony Bromides and Their Photoluminescent Properties

“…21 Sometimes, when applying different synthesis methods, halides with the same structure can exhibit different optical properties, i.e., Cs 2 InCl 5 • (H 2 O) can exhibit blue emission with a PLQY of 11.61% (hydrothermal method) or orange emission with a PLQY of 2.25% (recrystallization). 22 Here, we used 1-butyl-1-methyl-piperidinium (Bmpip + ) as the organic ligand to obtain 0D OHMHs. (Bmpip) 2 SbBr 5 and (Bmpip) 3 Sb 2 Br 9 were obtained by applying different synthesis methods.…”