Coordination of Thermally Activated Delayed Fluorescent Molecules for Efficient and Stable Perovskite Light‐Emitting Diodes

Author:

Chen Bo1,Liu He2,Yang Jonghee3,Ahmadi Mahshid4,Chen Qi5,Yin Ni5,Zhang Shitong6,Xiao Meiqin1,Zhang Haoyue1,Xu Long1,Chen Ping1ORCID

Affiliation:

1. Chongqing Key Laboratory of Micro&Nano Structure Optoelectronics School of Physical Science and Technology Southwest University Chongqing 400715 China

2. Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University Shenzhen 518055 China

3. Department of Chemistry Yonsei University Seoul 03722 Republic of Korea

4. Institute for Advanced Materials and Manufacturing Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996 USA

5. i‐Lab CAS Center for Excellence in Nanoscience Suzhou Institute of Nano‐Tech and Nano‐Bionics Chinese Academy of Sciences Suzhou 215123 China

6. State Key Laboratory of Supramolecular Structure and Materials Jilin University Qianjin Avenue 2699 Changchun 130012 China

Abstract

AbstractThe bandgap and operation stability of metal halide perovskites (MHPs) based light‐emitting diodes (PeLEDs) have been compromised by the substantial surface defect densities in the matrix. Today's defect passivation strategies rely on coordination actions of small‐molecular and/or polymeric ligands, which effectively enhance the optical properties of materials. However, the non‐trivial insulating characteristics of the molecules concurrently sacrifice the operation stability and external quantum efficiency (EQE) of the PeLEDs by augmenting the charge injection barrier at the interface. Herein, a coordinative, charge‐polarized organic semiconductor exhibiting thermally activated delayed fluorescence (TADF), namely 9,9‐dimethyl‐10‐(4‐(phenyl sulfonyl)phenyl)‐9,10‐dihydroacridine (SO‐DMAc) is coordinated, into the MHPs matrix for deep‐red PeLEDs. Owing to the distinctive charge transfer (CT) between the molecule and MHPs with exclusive coordination at the MHP's bottom, SO‐DMAc serves as a molecular bridge that significantly augments the hole injection into the PeLEDs. Encouraged by these improvements, efficient and stable deep red PeLEDs offering EQE of 21.8% and respective half lifetimes (T50) of luminance and EQE exceeding 6 and 35 h are demonstrated. It is revealed that the molecular coordination to the MHP surface is pivotal to manifesting the interfacial CT process for favorable energy level tuning.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Guangdong Province

Publisher

Wiley

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