Manipulation of Charge Dynamics for Efficient and Bright Blue Perovskite Light-Emitting Diodes with Chiral Ligands

Lingjiao Zhang,Sujuan Hu, Min Guo, Yunfei Ren, Linfeng Wei, Wenxuan Li, Faxu Lin,Zhiyong Yang,Zhenyu Yang,Chuan Liu,Baiquan Liu

Advanced materials (Deerfield Beach, Fla.)(2023)

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Perovskite 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.
blue emission,displays,high efficiency,light-emitting diodes,perovskites
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