Efficient Red-Emissive Circularly Polarized Electroluminescence Enabled by Quasi-2D Perovskite with Chiral Spacer Cation,ACS Nano

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Efficient Red-Emissive Circularly Polarized Electroluminescence Enabled by Quasi-2D Perovskite with Chiral Spacer Cation
ACS Nano ( IF 15.8 ) Pub Date : 2023-04-11 , DOI: 10.1021/acsnano.3c01054
Chang-Hui Yang _{1,

2} , Shang-Biao Xiao _{1,

2} , Hui Xiao ₂ , Liang-Jin Xu _{1,

2,

3,

4} , Zhong-Ning Chen _{1,

2,

3,

4}

Affiliation

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 S/R-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 (g_lum) of ∼2.1 × 10^–3. More importantly, a highly efficient, spin-polarized light-emitting diode (LED) was fabricated based on the in situ passivated quasi-2D perovskite with a peak external quantum efficiency of 3.7% and a maximum electroluminescence dissymmetry factor (g_EL) of ∼4.0 × 10^–3.

中文翻译：

具有手性间隔阳离子的准二维钙钛矿实现高效红光圆偏振电致发光

钙钛矿是用于圆偏振电致发光 (CPEL) 的有前途的环境可持续材料。虽然开发的基于钙钛矿的 CPEL 需要另一个手性非发射层，但我们在此报告了一种基于单层准二维钙钛矿的高效圆偏振电致发光，具有非手性苯乙基碘化铵 (PEAI) 和手性 S / R -1- ( 1-萘基)乙基碘化铵 (S/R-NEAI) 作为双间隔阳离子。准二维钙钛矿进一步被咔唑功能化的磷钝化。制造的薄膜不仅表现出圆二色性 (CD) 信号，而且表现出突出的圆偏振发光 (CPL) 活性，具有最大光致发光不对称因子 ( g _lum) ~2.1 × 10 ^–3。更重要的是，基于原位钝化的准二维钙钛矿制造了一种高效的自旋偏振发光二极管（LED），其峰值外量子效率为 3.7%，最大电致发光不对称因子（g _EL）为~ 4.0 × 10 ^–3。

更新日期：2023-04-11

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