Affiliation:
1. State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology Sun Yat‐sen University Guangzhou 510275 P. R. China
2. MOE Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional Materials School of Chemistry Sun Yat‐sen University Guangzhou 510275 P. R. China
3. Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistry Sun Yat‐sen University Guangzhou 510275 P. R. China
Abstract
AbstractPerovskite light‐emitting diodes (PeLEDs) emerge as a promising class of optoelectronic devices for next‐generation displays and lighting technology. However, the performance of blue PeLEDs lags far behind that of their green and red counterparts, including the unachieved trade‐off between high efficiency and high luminance, severe efficiency roll‐off, and unsatisfactory power efficiency. Here, a multi‐functional chiral ligand of L‐phenylalanine methyl ester hydrochloride is strategically introduced into quasi‐2D perovskites, which can effectively passivate defects, modulate the phase distribution, improve photoluminescence quantum yield, guarantee high‐quality film morphology, and enhance charge transport. Furthermore, ladder‐like hole transport layers are established, boosting charge injection and balance. The resultant sky‐blue PeLEDs (the photoluminescence peak is 493 nm and the electroluminescence peak is 497 nm) exhibit an external quantum efficiency of 12.43% at 1000 cd m−2 and a record power efficiency of 18.42 lm W−1, rendering that the performance is among the best blue PeLEDs.
Funder
National Natural Science Foundation of China
Innovation and Technology Fund
Fundamental Research Funds for the Central Universities
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
15 articles.
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