Toward narrowband emission: the chemical strategies for modifying boron-based luminescent materials

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 11; no. 34; pp. 11425 - 11439
• Main Authors: Liu, Fu-Ming, Ding, Ling-Yi, Yu, You-Jun, Li, Meng-Tian, Liao, Liang-Sheng, Jiang, Zuo-Quan
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 31.08.2023
• Subjects: Boron; Emission; Emitters; Excitons; High definition; Narrowband; Organic light emitting diodes
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d3tc00065f

Organic light-emitting diodes (OLEDs) with high-definition displays require narrowband emission from each pixel. Recently, boron-based thermally activated delayed fluorescence (TADF) emitters have gained broad attention in the OLED research field. They can effectively utilize both singlet and triplet excitons for electroluminescence, resulting in a small full width of half maximum (FWHM). The fused nitrogen/boron (N/B) system, known as the multi-resonance TADF (MR-TADF) system, has been making rapid progress. In this review, we summarize the current research progress in both traditional and MR-type boron derivatives with TADF characteristics from a molecular construction perspective. We discuss the molecular design strategy involved in maintaining high device efficiency and simultaneously achieving a narrowband emission profile. This review aims to provide insight and guidance for future developments for improving the stability, color purity, and performance of boron-based materials. In this graphic, the molecular design strategy for achieving high efficiency and maintaining a narrowband emission profile of boron-based thermally activated delayed fluorescence emitters is comprehensively summarized.