Efficient Chiral Ultraviolet and Deep-Blue Materials for High-Performance Circularly Polarized OLEDs

Abstract

High-performance circularly polarized organic light-emitting diodes (CP-OLEDs) with ultraviolet and deep-blue circularly polarized electroluminescence (CP-EL) are important for 3D displays, but designing short-wavelength circularly polarized luminescence (CPL) materials remains a significant challenge. Herein, a series of ultraviolet and deep-blue CPL materials was developed, successfully integrating high photoluminescence quantum yields with efficient high-level reverse intersystem crossing (hRISC) properties. Efficient ultraviolet and deep-blue CP-OLEDs are created by utilizing these chiral materials as emitters, providing maximum external quantum efficiencies (η_ext,maxs) of 6.7% at 398 nm (full-width at half-maximum [FWHM] = 44 nm) and 10.8% at 454 nm (FWHM = 68 nm) with obvious CP-EL. Furthermore, by adopting these chiral materials as sensitizers or functional layers, well-developed achiral multi-resonance thermally activated delayed fluorescence green and yellow emitters are enabled to generate obvious CP-EL with large dissymmetry factors and excellent EL performance (η_exts = 34.5% and 35.3%, FWHM = 42 and 40 nm). These results demonstrate that the developed new ultraviolet and deep-blue chiral materials can be used not only as emitters for ultraviolet and deep-blue CP-OLEDs, but also as sensitizers and functional layers to furnish a simple and universal way of achieving efficient narrow-spectrum CP-OLEDs with achiral emitters.

Keywords

circularly polarized electroluminescence / circularly polarized luminescence / multi-resonance / organic light-emitting diode / reverse intersystem crossing

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2025 The Author(s). Aggregate published by SCUT, AIEI, and John Wiley & Sons Australia, Ltd.