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<p>All-inorganic perovskite CsPbX<sub>3</sub> (X = Cl, Br, I) nanocrystals (NCs) have emerged as promising candidates for light-emitting diode (LED) displays due to their outstanding photophysical properties. However, their practical application remains hindered by poor stability and the inherent toxicity of Pb<sup>2+</sup>. In this study, we present a two-step heating method to synthesize CsPb<sub>1−<i>x</i></sub>Zn<sub><i>x</i></sub>Br<sub>3</sub> NCs with enhanced optoelectronic performance and uniform dispersion. The optimized Zn<sup>2+</sup>-doped NCs achieve a photoluminescence quantum yield (PLQY) of 86%, with a reduction in lattice spacing from 0.384 to 0.365 nm, attributed to increased perovskite lattice formation energy and effective surface passivation. To further improve stability, a silica (SiO<sub>2</sub>) shell is introduced via surface modification with (3-aminopropyl) triethoxysilane (APTES), forming CsPb<sub>0.7</sub>Zn<sub>0.3</sub>Br<sub>3</sub>@SiO<sub>2</sub> core–shell NCs. At an optimal APTES/B-site metal ion molar ratio of 1.8, the PLQY increases to 96%. The SiO<sub>2</sub> encapsulation significantly enhances environmental stability, with coated NCs retaining 43% of their initial photoluminescence (PL) intensity after immersion in water for 36 h, compared to only 5% for uncoated NCs. Furthermore, after ethanol treatment for 210 min, the coated NCs retain 39% of their initial PL intensity, while the uncoated counterparts retain merely 7%. The enhanced stability and luminescence performance of CsPb<sub>0.7</sub>Zn<sub>0.3</sub>Br<sub>3</sub>@SiO<sub>2</sub> NCs make them highly promising for LED applications. White light-emitting diodes (WLEDs) fabricated using these NCs exhibit a color rendering index (CRI) of 78.2, a correlated color temperature (CCT) of 5470 K, and a luminous efficiency (LE) of 54.2 lm/W, demonstrating significant potential for next-generation display and lighting technologies.</p>

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Preparation and fluorescence properties of SiO2-coated CsPb1−xZnxBr3 nanocrystals with enhanced efficiency and stability

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Zhe Qin,
  • Peng Wen,
  • Wenkui Wu,
  • Ting Chen,
  • Yiyuan Peng,
  • Fei Wang,
  • Zhixiang Xie

摘要

All-inorganic perovskite CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) have emerged as promising candidates for light-emitting diode (LED) displays due to their outstanding photophysical properties. However, their practical application remains hindered by poor stability and the inherent toxicity of Pb2+. In this study, we present a two-step heating method to synthesize CsPb1−xZnxBr3 NCs with enhanced optoelectronic performance and uniform dispersion. The optimized Zn2+-doped NCs achieve a photoluminescence quantum yield (PLQY) of 86%, with a reduction in lattice spacing from 0.384 to 0.365 nm, attributed to increased perovskite lattice formation energy and effective surface passivation. To further improve stability, a silica (SiO2) shell is introduced via surface modification with (3-aminopropyl) triethoxysilane (APTES), forming CsPb0.7Zn0.3Br3@SiO2 core–shell NCs. At an optimal APTES/B-site metal ion molar ratio of 1.8, the PLQY increases to 96%. The SiO2 encapsulation significantly enhances environmental stability, with coated NCs retaining 43% of their initial photoluminescence (PL) intensity after immersion in water for 36 h, compared to only 5% for uncoated NCs. Furthermore, after ethanol treatment for 210 min, the coated NCs retain 39% of their initial PL intensity, while the uncoated counterparts retain merely 7%. The enhanced stability and luminescence performance of CsPb0.7Zn0.3Br3@SiO2 NCs make them highly promising for LED applications. White light-emitting diodes (WLEDs) fabricated using these NCs exhibit a color rendering index (CRI) of 78.2, a correlated color temperature (CCT) of 5470 K, and a luminous efficiency (LE) of 54.2 lm/W, demonstrating significant potential for next-generation display and lighting technologies.