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

Chang-Hui Yang; Shang-Biao Xiao; Hui Xiao; Liang-Jin Xu; Zhong-Ning Chen

doi:10.1021/acsnano.3c01054

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

ACS Nano. 2023 Apr 25;17(8):7830-7836. doi: 10.1021/acsnano.3c01054. Epub 2023 Apr 11.

Authors

Chang-Hui Yang^{1

2}, Shang-Biao Xiao^{1

2}, Hui Xiao², Liang-Jin Xu^{1

2

3

4}, Zhong-Ning Chen^{1

2

3

4}

Affiliations

¹ College of Chemistry, Fuzhou University, Fuzhou 350108, Fujian, China.
² State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, Fujian, China.
³ Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, Fujian, China.
⁴ University of Chinese Academy of Sciences, Beijing 100039, China.

PMID: 37039626
DOI: 10.1021/acsnano.3c01054

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 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.

Keywords: chiral ligand; circular dichroism; circularly polarized luminescence and circularly polarized electroluminescence; quasi-2D perovskite.