Planar Chiral [2.2]Paracyclophane-Based Thermally Activated Delayed Fluorescent Materials for Circularly Polarized Electroluminescence

Chen Liao; Yu Zhang; Shang-Hui Ye; Wen-Hua Zheng

doi:10.1021/acsami.1c04779

Planar Chiral [2.2]Paracyclophane-Based Thermally Activated Delayed Fluorescent Materials for Circularly Polarized Electroluminescence

ACS Appl Mater Interfaces. 2021 Jun 2;13(21):25186-25192. doi: 10.1021/acsami.1c04779. Epub 2021 May 20.

Authors

Chen Liao¹, Yu Zhang¹, Shang-Hui Ye², Wen-Hua Zheng¹

Affiliations

¹ State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, Jiangsu China.
² Key Laboratory for Organic Electronics & Information Displays (KLOEID) and Institute of Advanced Materials, National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China.

PMID: 34014633
DOI: 10.1021/acsami.1c04779

Abstract

This work describes the construction of a novel planar chiral [2.2]paracyclophane-based thermally activated delayed fluorescence (TADF)-active molecule with circularly polarized luminescence (CPL). The combination of the bulky planar chiral phenoxazinephane (PXZp) donor based [2.2]paracyclophane and triazine acceptor enables the highly efficient luminescence performances and excellent CPL properties. The enantiomers exhibit excellent TADF activities, the energy difference (ΔE_ST) between singlet and triplet of the molecule is only 0.03 eV. Notably, through solution-process, a yellow CP-OLEDs based on the molecule as the emitting layers displays high maximum brightness (L_max) up to 34 293 cd m^-2, maximum external quantum efficiency (EQE_max) up to 7.8% and remarkable CP-EL signal with g_EL factor up to 4.6 × 10^-3.

Keywords: CP-OLED; TADF; [2.2]paracyclophane; chiral donor; circular polarized electroluminescence.