Microcavity Design Upping Light Extraction Efficiency over 50% in High-Index Perovskite Light-Emitting Diodes

Mei, Guanding1,2,3; Xiao, Xiangtian1,2,3; Ahmad, Sajjad1; Lin, Hong1; Tan, Yangzhi1,2,3; Wang, Kai2,3; Sun, Xiao Wei2,3; Choy, Wallace C. H.1

2023-09-01

10.1002/adom.202300912

ADVANCED OPTICAL MATERIALS   影响因子和分区

2195-1071

["Perovskite light-emitting diodes (PeLEDs) are promising candidates for lighting and display applications. However, perovskites usually have a relatively high refractive index compared to organic semiconductors, causing a lower optical efficiency due to a narrower escape cone. In this work, the theoretical analysis shows that the microcavity effect enables PeLEDs to achieve a light extraction efficiency of 51%, much higher than the & AP;20% estimated by the classical theory. Besides the interference in the microcavity, the efficiency improvement is also attributed to the low surface plasmon loss and a high ratio of horizontal dipoles under the Purcell effect. In a microcavity PeLED, a horizontal dipole shows three times the improvement in the Purcell factor of a vertical dipole, making the horizontal dipole with high efficiency contribute 86% of light output. Moreover, the experiment shows that the microcavity can increase the external quantum efficiency by 70%. A narrower spectrum and shorter photoluminescence lifetime are also observed. These phenomena are attributed to the simultaneous enhancement of light extraction efficiency and internal quantum efficiency. This work reveals the importance of microcavity design and provides guidance to break through the classical efficiency limit and achieve high-efficiency PeLEDs.","The microcavity effect in perovskite light-emitting diodes is enhanced by a semitransparent silver layer. The device structure is optimized based on the microcavity, resulting in a high light extraction efficiency of close to 50%. The experiment also verified the simulation, with an efficiency improvement from 8.5% to 14.4%.image"]

external quantum efficiency light extraction efficiency light-emitting diodes microcavity perovskites

SCI ; EI

英语

通讯

This research was supported by the feed funds (Grant Nos. 202011159254 and 202111159113) from the University Grant Council of the University of Hong Kong; the General Research Fund (Grant Nos. 17201819, 17211220, and 17200021); the Collaborative Research F["202011159254","202111159113"] ; University Grant Council of the University of Hong Kong["17201819","17211220","17200021"] ; (C7035-20G) from Hong Kong Special Administrative Region, China["22005131","52173169","62122034","61875082"] ; Key-Area Research and Development Program of Guangdong Province["2019B010925001","2019B010924001"] ; National Key Research and Development Program of China["2022YFB3606504","2022YFB3602903"] ; Guangdong University Key Laboratory for Advanced Quantum Dot Displays[2017KSYS007] ; Shenzhen Innovation Project["JCYJ20210324104413036","JCYJ20220818100411025"]

Materials Science ; Optics

Materials Science, Multidisciplinary ; Optics

WOS:001073677000001

WILEY-V C H VERLAG GMBH

20234014821630

Extraction ; Microcavities ; Quantum efficiency ; Refractive index ; Surface plasmons

Minerals:482.2 ; Electronic Components and Tubes:714 ; Light/Optics:741.1 ; Chemical Operations:802.3 ; Quantum Theory; Quantum Mechanics:931.4 ; Plasma Physics:932.3

Web of Science

1.Univ Hong Kong, Dept Elect & Elect Engn, Pokfulam Rd, Hong Kong 999077, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Univ, Key Lab Energy Convers & Storage Technol SUSTech, Inst Nanosci & Applicat,Minist Educ,Key Lab Adv Qu, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

Mei, Guanding,Xiao, Xiangtian,Ahmad, Sajjad,et al. Microcavity Design Upping Light Extraction Efficiency over 50% in High-Index Perovskite Light-Emitting Diodes[J]. ADVANCED OPTICAL MATERIALS,2023,11.

Mei, Guanding.,Xiao, Xiangtian.,Ahmad, Sajjad.,Lin, Hong.,Tan, Yangzhi.,...&Choy, Wallace C. H..(2023).Microcavity Design Upping Light Extraction Efficiency over 50% in High-Index Perovskite Light-Emitting Diodes.ADVANCED OPTICAL MATERIALS,11.

Mei, Guanding,et al."Microcavity Design Upping Light Extraction Efficiency over 50% in High-Index Perovskite Light-Emitting Diodes".ADVANCED OPTICAL MATERIALS 11(2023).