Efficient Red-Emissive Circularly Polarized Electroluminescence Enabled by Quasi-2D Perovskite with Chiral Spacer Cation.
basic_science · Level V
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- Record sourced from PubMed, PMID 37039626.
- Also identified by DOI 10.1021/acsnano.3c01054.
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Abstract
Perovskites are promising environmentally sustainable materials for circularly polarized electroluminescence (CPEL). While another chiral nonemissive layer is required for the developed perovskite-based CPEL, we report herein a highly efficient circularly polarized electroluminescence based on a single layer of quasi-2D perovskite with achiral phenethylammonium iodide (PEAI) and chiral <i>S</i>/<i>R</i>-1-(1-naphthyl)ethylammonium iodide (S/R-NEAI) as dual spacer cations. The quasi-2D perovskite was further passivated by carbazole-functionalized phosphonium. The as-fabricated film exhibits not only a circular dichroism (CD) signal but also prominent circularly polarized luminescence (CPL) activity with a maximum photoluminescence dissymmetry factor (<i>g</i><sub>lum</sub>) of ∼2.1 × 10<sup>-3</sup>. More importantly, a highly efficient, spin-polarized light-emitting diode (LED) was fabricated based on the <i>in situ</i> passivated quasi-2D perovskite with a peak external quantum efficiency of 3.7% and a maximum electroluminescence dissymmetry factor (<i>g</i><sub>EL</sub>) of ∼4.0 × 10<sup>-3</sup>.