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<p>Methylammonium lead bromide (MAPbBr<sub>3</sub>) nano-suspensions were synthesized through a simple, low-temperature emulsion–demulsion route, offering a scalable alternative to conventional hot-injection or ligand-assisted methods. These nano-suspensions enabled the deposition of uniform MAPbBr<sub>3</sub> thin films on rigid substrates via spin coating. Structural analysis confirmed the formation of a cubic perovskite phase, supported by XRD, Raman spectroscopy, and TEM. The films exhibited a direct bandgap of ~ 2.23&#xa0;eV and intense, color-stable green photoluminescence centered at 536&#xa0;nm. AFM revealed a relatively high surface roughness (RMS ~ 111.6&#xa0;nm), while XPS verified the expected elemental composition and valence states. When integrated onto 380&#xa0;nm UV chips, the MAPbBr<sub>3</sub> films functioned as efficient down-conversion layers, producing a bright green emission with a high color purity of 94.5% and CIE coordinates of (0.3064, 0.6663). This study demonstrates a facile, solution-processed pathway for perovskite-based green emitters, highlighting their potential as low-cost alternatives to rare-earth phosphors in solid-state lighting applications.</p>

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Optical and Structural Characterization of MAPbBr3 Thin Films Synthesized via Emulsion–Demulsion for PeLED Applications

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • R. Adithya Nath,
  • Aruna Raj,
  • Jishad A. Salam,
  • Akhil M. Anand,
  • R. Jayakrishnan

摘要

Methylammonium lead bromide (MAPbBr3) nano-suspensions were synthesized through a simple, low-temperature emulsion–demulsion route, offering a scalable alternative to conventional hot-injection or ligand-assisted methods. These nano-suspensions enabled the deposition of uniform MAPbBr3 thin films on rigid substrates via spin coating. Structural analysis confirmed the formation of a cubic perovskite phase, supported by XRD, Raman spectroscopy, and TEM. The films exhibited a direct bandgap of ~ 2.23 eV and intense, color-stable green photoluminescence centered at 536 nm. AFM revealed a relatively high surface roughness (RMS ~ 111.6 nm), while XPS verified the expected elemental composition and valence states. When integrated onto 380 nm UV chips, the MAPbBr3 films functioned as efficient down-conversion layers, producing a bright green emission with a high color purity of 94.5% and CIE coordinates of (0.3064, 0.6663). This study demonstrates a facile, solution-processed pathway for perovskite-based green emitters, highlighting their potential as low-cost alternatives to rare-earth phosphors in solid-state lighting applications.