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Manganese-Doped, Lead-Free Double Perovskite Nanocrystals for Bright Orange-Red Emission.

ABSTRACT: Lead-free halide perovskite nanocrystals (NCs) have recently attracted attention due to their nontoxicity and stability as alternatives to lead-based perovskite NCs. Here, we report undoped and manganese-doped all-inorganic, lead-free double perovskite (DP) NCs: Cs2NaIn x Bi1-x Cl6 (0 < x < 1) and Cs2NaIn x Bi1-x Cl6:Mn (0 ? x ? 1) NCs. Undoped NCs exhibit blue emission. Through doping Mn2+ ions into Cs2NaIn x Bi1-x Cl6 NCs, we can avoid self-trapped exciton emission and realize bright orange red emission of Mn2+ dopants with the highest photoluminescence quantum efficiency of 44.6%. The photoluminescence (PL) is tunable from yellow emission to orange-red emission corresponding to a red shift from 583 to 614 nm with increasing In content. Interestingly, the PL emission of Mn-doped NCs shows a red shift from the bulk size to the nanoscale. The Mn-doped NCs show good stability in air. In addition, we further prove the process of dark self-trapped state-assisted Mn2+ emission in DP NCs by ultrafast transient absorption techniques.

SUBMITTER: Han P 

PROVIDER: S-EPMC7181313 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature

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Manganese-Doped, Lead-Free Double Perovskite Nanocrystals for Bright Orange-Red Emission.

Han Peigeng P   Zhang Xue X   Luo Cheng C   Zhou Wei W   Yang Songqiu S   Zhao Jianzhang J   Deng Weiqiao W   Han Keli K  

ACS central science 20200317 4

Lead-free halide perovskite nanocrystals (NCs) have recently attracted attention due to their nontoxicity and stability as alternatives to lead-based perovskite NCs. Here, we report undoped and manganese-doped all-inorganic, lead-free double perovskite (DP) NCs: Cs<sub>2</sub>NaIn <sub><i>x</i></sub> Bi<sub>1-<i>x</i></sub> Cl<sub>6</sub> (0 < <i>x</i> < 1) and Cs<sub>2</sub>NaIn <sub><i>x</i></sub> Bi<sub>1-<i>x</i></sub> Cl<sub>6</sub>:Mn (0 ≤ <i>x</i> ≤ 1) NCs. Undoped NCs exhibit blue emissi  ...[more]

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