Journal
ADVANCED OPTICAL MATERIALS
Volume 10, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202101344
Keywords
In-based NCs containing coordinated H; O-2; lead-free perovskite variants; nanocrystals; photoluminescence; PL emission mechanism
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Funding
- National Key Research and Development Program of China [2017YFA0204800]
- National Natural Science Foundation of China [11974185, 21833009, 21533010, 21525315, 22088102]
- Natural Science Foundation of Jiangsu Province [BK20170032]
- Scientific Instrument Developing Project of the Chinese Academy of Sciences [YJKYYQ20190003]
- Liao Ning Revitalization Talents Program [XLYC1802126]
- Dalian City Foundation for Science and Technology Innovation [2019J12GX031]
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This study introduced a new type of lead-free halide perovskite variant nanocrystals, with Sb-doped NCs exhibiting green emission and showing higher photoluminescence quantum efficiency and better stability. Additionally, In-based perovskite variant NCs containing coordinated water were successfully synthesized, achieving a high PLQE for Sb-doped Cs2InCl5(H2O) NCs. The emission mechanism was further elucidated using temperature-dependent PL and femtosecond transient absorption techniques.
Lead-free halide perovskites and their variants have attracted great attention due to their non-toxicity and good photophysical properties. Here, a series of undoped and antimony-doped all-inorganic, 0D, indium-based perovskite variant nanocrystals (NCs): (RbxCs1-x)(3)InCl6 and (RbxCs1-x)(3)InCl6:Sb (0 <= x <= 1) NCs, is reported. Among them, Sb-doped NCs exhibit green emission. Mixing Rb-Cs NCs show the higher photoluminescence (PL) quantum efficiency (PLQE) and better stability than unalloyed NCs (x = 0 or 1). The effect of crystal size on PL property of (Rb0.75Cs0.25)(3)InCl6:Sb is analyzed in detail. More interestingly, In-based perovskite variant NCs containing coordinated water are successfully synthesized by a two-step method (variable temperature hot injection and saturated steam post treatment). The best PLQE of Sb-doped Cs2InCl5(H2O) NCs reaches 95.5%, which is a new PLQE record for yellow emissive lead-free perovskite and variant NCs. In addition, the emission mechanism is further clarified by temperature-dependent PL and femtosecond transient absorption techniques.
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