Abstract
Perovskite light-emitting diodes(PeLEDs)exhibit remarkable potential in the field of displays and solid-state lighting.However,blue PeLEDs,a key element for practical applications,still lag behind their green and red counterparts,due to a combination of strong nonradiative recombination losses and unoptimized device structures.In this report,we propose a buried interface modification strategy to address these challenges by focusing on the bottom-hole transport layer(HTL)of the PeLEDs.On the one hand,a mul-tifunctional molecule,aminoacetic acid hydrochloride(AACl),is introduced to modify the HTL/perovskite interface to regulate the perovskite crystallization.Experimental investigations and theoretical calcula-tions demonstrate that AACl can effectively reduce the nonradiative recombination losses in bulk per-ovskites by suppressing the growth of low-n perovskite phases and also the losses at the bottom interface by passivating interfacial defects.On the other hand,a self-assembly nanomesh structure is ingeniously developed within the HTLs.This nanomesh structure is meticulously crafted through the blending of poly-(9,9-dioctyl-fluorene-co-N-(4-butyl phenyl)diphenylamine)and poly(n-vinyl car-bazole),significantly enhancing the light outcoupling efficiency in PeLEDs.As a result,our blue PeLEDs achieve remarkable external quantum efficiencies,20.4％at 487 nm and 12.5％at 470 nm,which are among the highest reported values.Our results offer valuable insights and effective methods for achiev-ing high-performance blue PeLEDs.
基金项目
National Natural Science Foundation of China(12134010)
National Natural Science Foundation of China(62074117)
National Natural Science Foundation of China(12174290)
Key R&D program from Hubei Province(2023BAB102)
ERC Consolidator Grant(LEAP)
ERC Consolidator Grant(101045098)
Swedish Government Strategic Research Area in Materials Science on Functional Materials at Link?ping University(SFO-Mat-LiU 2009-00971)
NETL
NSTL
万方数据