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Manipulating Electron-Phonon Coupling for Efficient Tin Halide Perovskite Blue LEDs.

Ying Han1, Zhenyu Guo1, Shaocheng Liu1

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Researchers developed lead-free blue LEDs using tin-based perovskites. By incorporating a rigid organic structure, they achieved stable blue light emission, overcoming previous limitations and paving the way for safer lighting technologies.

Keywords:
Sn‐based perovskiteselectron‐phonon couplingexternal quantum efficiencylattice rigiditylight‐emitting diodes

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid-State Chemistry

Background:

  • Low-dimensional perovskites offer excellent properties for light-emitting diodes (LEDs).
  • Lead (Pb) toxicity concerns hinder commercialization of Pb-based perovskites.
  • Tin (Sn)-based perovskites are promising alternatives but suffer from blue emission quenching due to strong electron-phonon coupling at room temperature (RT).

Purpose of the Study:

  • To develop efficient and stable Sn-based perovskite blue LEDs.
  • To address the challenge of blue emission quenching in Sn-based perovskites.
  • To provide a lead-free alternative for blue LED technology.

Main Methods:

  • Synthesized a 100-oriented 2D perovskite, (BrPMA)2SnBr4, using protonated 4-bromobenzylamine (BrPMA+) as the A-site cation.
  • Incorporated a rigid organic skeleton to enhance lattice rigidity and reduce electron-phonon coupling.
  • Optimized thin-film fabrication by inhibiting oxidation and promoting crystallization.

Main Results:

  • Achieved excellent blue photoluminescence (PL) emission at RT due to weak electron-phonon coupling.
  • Fabricated the first Sn-based perovskite blue LED emitting at 467 nm.
  • Demonstrated a champion external quantum efficiency (EQE) of 1.3% and a maximum brightness of 800 cd m⁻².

Conclusions:

  • The rigid organic skeleton effectively suppresses electron-phonon coupling in Sn-based perovskites.
  • This work presents a viable pathway for developing lead-free blue LEDs.
  • Provides new insights into the luminescence mechanisms of Sn-based perovskites for future optoelectronic applications.