Ionic Liquid Passivation for High-Performance Sky-Blue Quasi-2D Perovskite Light-Emitting Diodes

Sun, Jiayun1,2; Ren, Zhenwei2; Wang, Zhaojin1; Wang, Haoran3,4; Wu, Dan5; Sun, Xiao Wei1; Choy, Wallace C. H.2; Wang, Kai1

2023-03-01

10.1002/adom.202202721

ADVANCED OPTICAL MATERIALS   Impact Factor & Quartile

2195-1071

Great progress has been made in high-performance perovskite light-emitting diodes (PeLEDs). However, the external quantum efficiency (EQE) of blue PeLEDs still lags. Particularly, defects are inevitable in solution-processed perovskite films, which inhibit the efficient radiative recombination in blue PeLEDs. Herein, a facile ionic liquid (IL, 1,3-dimethyl-3-imidazolium hexafluorophosphate) post-treatment on the as-fabricated quasi-2D perovskite film is reported, to passivate the uncoordinated Pb through the strong interaction with IL. The IL-assisted perovskite film demonstrates a great enhancement of radiative recombination efficiency, and the photoluminescence quantum yield of the film increases from 35.7% to 74.6%. IL post-treatment also adjusts the energy level of perovskite film and enhances the hole injection in PeLED. As a result, the peak EQE of the sky-blue quasi-2D PeLED is improved from 4.0% to 9.0%, while the turn-on voltage is reduced from 3.3 to 3.0 V. This work contributes to a feasible and effective approach for improving the quality of blue quasi-2D perovskites and enhancing the efficiency of blue PeLEDs.

defect passivation ionic liquids sky-blue perovskite light-emitting diodes

SCI

English

First ; Corresponding

National Key Research and Development Program of China[2022YFB3606504] ; National Natural Science Foundation of China[62122034] ; Guangdong Basic and Applied Basic Research Foundation[2022A1515011071] ; Shenzhen Basic Research General Program["JCYJ20210324104413036","JCYJ20190809152411655"] ; General Research Fund from the Research Grants Council of Hong Kong Special Administrative Region, China["17201819","17211220","17200021"] ; Research Grants Council of Hong Kong Special Administrative Region, China[C5035-20G] ; Shenzhen Stable Support Research Foundation[20220717215521001] ; Natural Science Foundation of Top Talent of Shenzhen Technology University (SZTU)[GDRC202110]

Materials Science ; Optics

Materials Science, Multidisciplinary ; Optics

WOS:000953358100001

WILEY-V C H VERLAG GMBH

Web of Science

1.Southern Univ Sci & Technol, Dept Elect & Elect Engn, 1088 Xueyuan Ave, Shenzhen 518055, Peoples R China
2.Univ Hong Kong, Dept Elect & Elect Engn, Pokfulam Rd, Hong Kong, Peoples R China
3.Harbin Inst Technol, Sch Mat Sci & Engn, Campus Univ Town Shenzhen, Shenzhen 518055, Peoples R China
4.Harbin Inst Technol, Shenzhen Key Lab Flexible Printed Elect Technol, Campus Univ Town Shenzhen, Shenzhen 518055, Peoples R China
5.Shenzhen Technol Univ, Coll New Mat & New Energies, 3002 Lantian Rd, Shenzhen 518118, Peoples R China

Sun, Jiayun,Ren, Zhenwei,Wang, Zhaojin,et al. Ionic Liquid Passivation for High-Performance Sky-Blue Quasi-2D Perovskite Light-Emitting Diodes[J]. ADVANCED OPTICAL MATERIALS,2023.

Sun, Jiayun.,Ren, Zhenwei.,Wang, Zhaojin.,Wang, Haoran.,Wu, Dan.,...&Wang, Kai.(2023).Ionic Liquid Passivation for High-Performance Sky-Blue Quasi-2D Perovskite Light-Emitting Diodes.ADVANCED OPTICAL MATERIALS.

Sun, Jiayun,et al."Ionic Liquid Passivation for High-Performance Sky-Blue Quasi-2D Perovskite Light-Emitting Diodes".ADVANCED OPTICAL MATERIALS (2023).