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<p>We report on the hybrid dual-emission characteristics of GaN-based ultraviolet light-emitting diodes (UV-LEDs) integrated with CH₃NH₃PbBr₃ (MAPbBr₃) perovskite photoluminescent coatings. The resulting device exhibits two spectrally distinct emission bands: a near-UV peak arising from the InGaN/GaN multiple quantum wells and a green emission generated via radiative reabsorption and subsequent photoluminescence (PL) within the perovskite layer. Contrary to the conventional down-conversion assumption, the green emission intensity diminishes with increasing injection current, while simultaneously exhibiting a substantial spectral narrowing and a fixed red-shift. Both UV and green bands show wavelength shifts and linewidth evolution that indicate complex light–matter interactions at the GaN/sapphire/perovskite interfaces, including nonlinear photon reabsorption, saturation of excitonic recombination, and cavity-modulated optical filtering. These findings redefine the role of perovskite coatings as more than passive converters and suggest their active photonic influence on emission dynamics in hybrid LED architectures.</p>

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Hybrid dual emission in perovskite-coated GaN-based ultraviolet light-emitting diodes

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Seonghoon Jeong,
  • Yohan Lee,
  • Yunju Choi,
  • Hyunsoo Kim

摘要

We report on the hybrid dual-emission characteristics of GaN-based ultraviolet light-emitting diodes (UV-LEDs) integrated with CH₃NH₃PbBr₃ (MAPbBr₃) perovskite photoluminescent coatings. The resulting device exhibits two spectrally distinct emission bands: a near-UV peak arising from the InGaN/GaN multiple quantum wells and a green emission generated via radiative reabsorption and subsequent photoluminescence (PL) within the perovskite layer. Contrary to the conventional down-conversion assumption, the green emission intensity diminishes with increasing injection current, while simultaneously exhibiting a substantial spectral narrowing and a fixed red-shift. Both UV and green bands show wavelength shifts and linewidth evolution that indicate complex light–matter interactions at the GaN/sapphire/perovskite interfaces, including nonlinear photon reabsorption, saturation of excitonic recombination, and cavity-modulated optical filtering. These findings redefine the role of perovskite coatings as more than passive converters and suggest their active photonic influence on emission dynamics in hybrid LED architectures.