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<p>Perovskites have emerged as promising alternatives for circularly polarized electroluminescence (CPEL) compared to traditional organic fluorescent materials and metal complex-based phosphorescent materials due to their superior optoelectronic properties. However, achieving efficient CPEL with high external quantum efficiency (EQE) in perovskite materials using the chirality-induced spin selectivity (CISS) strategy in multilayer heterostructures remains challenging. Here, we developed an <i>in-situ</i> approach to construct a monolayer chiral emitting perovskite nanocrystal film using a chiral quaternary phosphonium salt, (R)-/(S)-triphenyl((1-phenylethyl)amino)phosphonium bromide (R-/S-TPNPE), as matrix and passivating ligand. This approach significantly passivates defects, improves film morphology, and induces spin polarization of excitons. The passivated films exhibit excellent circularly polarized luminescence (CPL) with a photoluminescence quantum yield (PLQY) exceeding 80% and a luminescence asymmetry factor (<i>g</i><sub>lum</sub>) of −1.5 × 10<sup>−2</sup>. Notably, the circularly polarized light-emitting diodes (CP-LEDs) fabricated from the passivated film achieve a record EQE of 16.1% and an electroluminescence asymmetry factor (<i>g</i><sub>EL</sub>) of −2.3 × 10<sup>−2</sup>, representing the best performance in chiral perovskites. Our method provides a reliable and convenient pathway for producing high-performance CP-LEDs, achieving the maximum value of EQE in the field of Pb-based perovskite CPEL.</p>

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Highly efficient circularly polarized electroluminescence in 3D perovskites passivated by chiral phosphonium halides

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • De-Hao Kong,
  • Song Zheng,
  • Hao Zeng,
  • Quanwei Song,
  • Man-Chung Tang,
  • Daqin Chen,
  • Liang-Jin Xu,
  • Zhong-Ning Chen

摘要

Perovskites have emerged as promising alternatives for circularly polarized electroluminescence (CPEL) compared to traditional organic fluorescent materials and metal complex-based phosphorescent materials due to their superior optoelectronic properties. However, achieving efficient CPEL with high external quantum efficiency (EQE) in perovskite materials using the chirality-induced spin selectivity (CISS) strategy in multilayer heterostructures remains challenging. Here, we developed an in-situ approach to construct a monolayer chiral emitting perovskite nanocrystal film using a chiral quaternary phosphonium salt, (R)-/(S)-triphenyl((1-phenylethyl)amino)phosphonium bromide (R-/S-TPNPE), as matrix and passivating ligand. This approach significantly passivates defects, improves film morphology, and induces spin polarization of excitons. The passivated films exhibit excellent circularly polarized luminescence (CPL) with a photoluminescence quantum yield (PLQY) exceeding 80% and a luminescence asymmetry factor (glum) of −1.5 × 10−2. Notably, the circularly polarized light-emitting diodes (CP-LEDs) fabricated from the passivated film achieve a record EQE of 16.1% and an electroluminescence asymmetry factor (gEL) of −2.3 × 10−2, representing the best performance in chiral perovskites. Our method provides a reliable and convenient pathway for producing high-performance CP-LEDs, achieving the maximum value of EQE in the field of Pb-based perovskite CPEL.