White Fluorescent Organic Light-Emitting Diodes with 100% Power Conversion

Dongxue Ding; Zicheng Wang; Chunbo Duan; Chunmiao Han; Jing Zhang; Shuo Chen; Ying Wei; Hui Xu

doi:10.34133/research.0009

Research (Jan 2022)

White Fluorescent Organic Light-Emitting Diodes with 100% Power Conversion

Dongxue Ding,
Zicheng Wang,
Chunbo Duan,
Chunmiao Han,
Jing Zhang,
Shuo Chen,
Ying Wei,
Hui Xu

Affiliations

Dongxue Ding: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin, Heilongjiang, China.
Zicheng Wang: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin, Heilongjiang, China.
Chunbo Duan: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin, Heilongjiang, China.
Chunmiao Han: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin, Heilongjiang, China.
Jing Zhang: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin, Heilongjiang, China.
Shuo Chen: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin, Heilongjiang, China.
Ying Wei: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin, Heilongjiang, China.
Hui Xu: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, Harbin, Heilongjiang, China.

DOI: https://doi.org/10.34133/research.0009
Journal volume & issue: Vol. 2022

Abstract

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Energy-efficient lighting sources are desired to provide another solution of carbon emission reduction. White organic light-emitting diodes are promising, because of theoretical internal quantum efficiencies for 100% electric-to-light conversion. However, pure organic fluorescent materials still face a challenge in harvesting triplet excitons for radiation. Herein, we report a white fluorescent organic light-emitting diode having an external quantum efficiency of 30.7% and a power efficiency of 120.2 lm W−1. In the single emissive layers, we use blue thermally activated delayed fluorescent emitters to sensitize a yellow fluorescent emitter. Transient photoluminescence and electroluminescence analyses suggest that a blue thermally activated delayed fluorescent molecule with ~100% reverse intersystem crossing efficiency and negligible triplet nonradiative rate constant completely converts triplet to singlet, suppressing triplet quenching by a yellow fluorescent emitter and ensuring 100% power conversion.

Published in Research

ISSN: 2096-5168 (Print); 2639-5274 (Online)
Publisher: American Association for the Advancement of Science (AAAS)
Country of publisher: United States
LCC subjects: Science
Website: https://spj.science.org/journal/research

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