Work

Macrocyclic Dual‐ and Tetra‐Borated Multi‐Resonance Thermally Activated Delayed Fluorescence Materials Based on Tetraazacyclophane

Year: 2026

Type: article

Abstract: In multiple-resonance-induced thermally activated delayed fluorescence (MR-TADF) materials with a meta B-π-B configuration, most studies mainly focused on linear multi-boron frameworks. In this study, we report two macrocyclic dual- and tetra-borated MR-TADF materials based on tetraazacyclophane (DPN2B and DPN4B). By rationally selecting boron sources and reaction conditions, one-pot double and quadruple borylation reactions were achieved. In toluene, DPN2B and DPN4B exhibit deep blue narrowband emission peaking at 451 and 442 nm, with full widths at half maximum of 22 and 25 nm, respectively. Solution-processed organic light-emitting diodes (OLEDs) based on DPN2B and DPN4B show pure-blue electroluminescence with peaks at 458 and 452 nm, with maximum external quantum efficiencies of 6.4% and 4.0%, respectively. The DPN2B-based device achieves Commission Internationale de l'Éclairage coordinates of (0.14 and 0.07). This work provides a practical macrocyclic molecular design strategy for developing multi-borated MR-TADF emitters and OLEDs.

Source: Angewandte Chemie International Edition

DOI: 10.1002/anie.7100719

Authors: Hua‐Xiu Ni, Lei Hua, Jia‐Jun Hu, Li Yuan, Yafei Wang, You‐Xuan Zheng

Institutions: Nanjing University, Changzhou University

Language: English

Topic: Organic Light-Emitting Diodes Research

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, Natural Science Foundation of Jiangsu Province

Awards: G5746037278, G7177417772