Efficient Circularly Polarized Electroluminescence from Achiral Luminescent Materials

• Published in: Angewandte Chemie International Edition Vol. 62; no. 20; pp. e202300492 - n/a
• Main Authors: Xu, Letian, Liu, Hao, Peng, Xiaoluo, Shen, Pingchuan, Tang, Ben Zhong, Zhao, Zujin
• Format: Journal Article
• Language: English
• Published: WEINHEIM Wiley 08.05.2023; Wiley Subscription Services, Inc
• Edition: International ed. in English
• Subjects: Achiral Materials; Chemistry; Chemistry, Multidisciplinary; Circular polarization; Circularly Polarized Luminescence; Electroluminescence; Emitters; Fluorescence; Organic light emitting diodes; Organic Light-Emitting Diode; Phosphorescence; Photoluminescence; Photons; Physical Sciences; Quantum efficiency; Science & Technology; Sensitization; LIGHT-EMITTING-DIODES; Circularly Polarized Luminescence; Achiral Materials; Electroluminescence; Sensitization; Organic Light-Emitting Diode; ACTIVATED DELAYED FLUORESCENCE
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.202300492

Circularly polarized electroluminescence (CP‐EL) is generally produced in organic light‐emitting diodes (OLEDs) based on special CP luminescent (CPL) materials, while common achiral luminescent materials are rarely considered to be capable of direct producing CP‐EL. Herein, near ultraviolet CPL materials with high photoluminescence quantum yields and good CPL dissymmetry factors are developed, which can induce blue to red CPL for various achiral luminescent materials. Strong near ultraviolet CP‐EL with the best external quantum efficiencies (ηexts) of 9.0 % and small efficiency roll‐offs are achieved by using them as emitters for CP‐OLEDs. By adopting them as hosts or sensitizers, commercially available yellow‐orange achiral phosphorescence, thermally activated delayed fluorescence (TADF) and multi‐resonance (MR) TADF materials can generate intense CP‐EL, with high dissymmetry factors and outstanding ηexts (30.8 %), demonstrating a simple and universal avenue towards efficient CP‐EL. Novel near ultraviolet circularly polarized luminescence (CPL) materials with excellent circularly polarized electroluminescence (CP‐EL) properties are developed, which can sensitize diverse achiral luminescent materials to produce efficient CP‐EL with the state‐of‐the‐art EL efficiencies.