期刊
ADVANCED MATERIALS
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202308487
关键词
lanthanide dopants; lead-free double perovskites; light-emitting diodes; quantum dots; self-trapped excitons
This study improves the electroluminescent efficiency of lead-free double perovskites by introducing terbium doping and a guest-host strategy, achieving a significant increase in luminance and external quantum efficiency.
Lead-free double perovskites (DPs) are emerging highly stable emitters with efficient broadband self-trapped exciton (STE) photoluminescence (PL), but their low electroluminescent (EL) efficiency is a critical shortcoming. This work promotes the external quantum efficiency (EQE) and luminance of DP-based white light-emitting diode (wLED) with a normal device structure to 0.76% and 2793 cd m-2 via two modifications: This work prevents the formation of adverse metallic silver, spatially confined STE, and lowers local site symmetry in Cs2Na0.4Ag0.6In0.97Bi0.03Cl6 DP by terbium doping; and this work develops a guest-host strategy to improve film morphology, reduce defect density, and increase carrier mobility. These alterations cause substantial increase in STE radiative recombination and charge injection efficiency of perovskite layer. Finally, pure white EL with ideal color coordinates of (0.328, 0.329) and a record-breaking optoelectronic performance is achieved by introducing additional green carbon dots in LED to fill the deficient green component. Terbium doping and guest-host strategy are adopted to substantially enhance STEradiative recombination and charge injection efficiency in lead-free DP emitting layer. Consequently, a record luminance of 2793 cd m-2 and EQE of 0.76% for the constructed white LED are reported, substantially surpassing those of recently reported DP-based EL devices.image
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据