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Spectra stable blue perovskite light-emitting diodes.

Abstract：

:Device performance and in particular device stability for blue perovskite light-emitting diodes (PeLEDs) remain considerable challenges for the whole community. In this manuscript, we conceive an approach by tuning the 'A-site' cation composition of perovskites to develop blue-emitters. We herein report a Rubidium-Cesium alloyed, quasi-two-dimensional perovskite and demonstrate its great potential for pure-blue PeLED applications. Composition engineering and in-situ passivation are conducted to further improve the material's emission property and stabilities. Consequently, we get a prominent film photoluminescence quantum yield of around 82% under low excitation density. Encouraged by these findings, we finally achieve a spectra-stable blue PeLED with the peak external quantum efficiency of 1.35% and a half-lifetime of 14.5 min, representing the most efficient and stable pure-blue PeLEDs reported so far. The strategy is also demonstrated to be able to generate efficient perovskite blue emitters and PeLEDs in the whole blue spectral region (from 454 to 492 nm).

journal_name

Nat Commun

journal_title

Nature communications

authors

Jiang Y,Qin C,Cui M,He T,Liu K,Huang Y,Luo M,Zhang L,Xu H,Li S,Wei J,Liu Z,Wang H,Kim GH,Yuan M,Chen J

doi

10.1038/s41467-019-09794-7

subject

Has Abstract

pub_date

2019-04-23 00:00:00

pages

1868

issue

1

issn

2041-1723

pii

10.1038/s41467-019-09794-7

journal_volume

10

pub_type

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