Affiliation:
1. Jihua Laboratory 28 Huandao South Road Foshan Guangdong 528200 China
2. State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 China
3. Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education School of Life Science Jilin University Changchun 130012 China
4. Jihua Hengye Electronic Materials CO. LTD. Foshan Guangdong 528200 China
Abstract
AbstractThe advent of multi‐resonance thermally activated delayed fluorescence (MR‐TADF) materials, heralding cutting‐edge emitters with superior efficiency and color fidelity, represents a momentous stride in the realm of organic light‐emitting diodes (OLEDs). In this particular investigation, substantial advancements have been made by enhancing, synthesizing, and characterizing three distinct MR‐type emitters through meticulous control of peripheral decorations using frontier molecular orbital engineering. Through strategic attachment of various pyrimidine derivatives to the positions of the lowest unoccupied molecular orbitals (LUMO) of the parent molecule, the molecular excited state attributes are meticulously tailored, leading to the development of orange‐red MR‐TADF emitters. These designed molecules have demonstrated an emission spectrum shift from orange‐red to orange, exhibiting peak wavelengths spanning the range of 585–608 nm and full width at half‐maximums (FWHM) between 36 and 43 nm. This signifies a remarkable precision in managing the emission maxima of MR‐TADF emitters. Astonishingly, the solution‐processed OLEDs have showcased vibrant orange‐red electroluminescence, characterized by peak wavelengths ranging from 587 to 611 nm, accompanied by a notable external quantum efficiency nearing 20%.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Jihua Laboratory
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
6 articles.
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