4.8 Article

Near-Unity Red Mn2+ Photoluminescence Quantum Yield of Doped CsPbCl3 Nanocrystals with Cd Incorporation

期刊

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 11, 期 6, 页码 2142-2149

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c00372

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资金

  1. National Natural Science Foundation of China [11774134, 11704152, 51902064]
  2. National Key Research and Development Program of China [2016YFB0401701]
  3. special fund of Guangxi Bagui Scholars
  4. special fund of Guangxi Hundred-Talent Program

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Although Mn2+ doping in semiconductor nanocrystals (NCs) has been studied for nearly three decades, the near 100% photoluminescence (PL) quantum yield (QY) of Mn2+ emission has never been realized so far. Herein, greatly improved PL QYs of Mn2+ emissions are reported in Mn2+-doped CsPbCl3 NCs with various Mn2+ doping concentrations after CdCl2 post-treatment at room temperature. Specifically, the near-unity QY and near single-exponential decay of red Mn2+ emission peaking at 627 nm in doped CsPbCl3 NCs are obtained for the first time. The temperature dependence of steady-state and time-resolved PL spectra reveals that the CdCl2 post-treatment significantly reduces the nonradiative defect states and enhances the energy transfer from host to Mn2+ ions. Moreover, the Mn2+:CsPbCl3 NCs after CdCl2 post-treatment exhibit robust stability and high PL QYs after multipurification. The results will provide an effective route to obtain doped perovskite NCs with high performance for white lighting emitting diodes.

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