Minimising efficiency roll-off in high-brightness perovskite light-emitting diodes

被引：366

作者：

Zou, Wei ^{[1
,2
]}

Li, Renzhi ^{[1
,2
]}

Zhang, Shuting ^{[1
,2
]}

Liu, Yunlong ^{[1
,2
,3
]}

Wang, Nana ^{[1
,2
]}

Cao, Yu ^{[1
,2
]}

Miao, Yanfeng ^{[1
,2
]}

Xu, Mengmeng ^{[1
,2
]}

Guo, Qiang ^{[1
,2
]}

Di, Dawei ^{[4
]}

Zhang, Li ^{[1
,2
]}

Yi, Chang ^{[1
,2
]}

Gao, Feng ^{[5
]}

Friend, Richard H. ^{[4
]}

Wang, Jianpu ^{[1
,2
]}

Huang, Wei ^{[1
,2
,6
,7
,8
]}

机构：

[1] Nanjing Tech Univ, Key Lab Flexible Elect, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, 30 South Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China

[2] Nanjing Tech Univ, Inst Adv Mat, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, 30 South Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China

[3] Liaocheng Univ, Sch Phys Sci & Informat Technol, Liaocheng 252059, Shandong, Peoples R China

[4] Univ Cambridge, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England

[5] Linkoping Univ, IFM, Biomol & Organ Elect, S-58183 Linkoping, Sweden

[6] Nanjing Univ Posts & Telecommun, Key Lab Organ Elect & Informat Displays, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, 9 Wenyuan Rd, Nanjing 210023, Jiangsu, Peoples R China

[7] Nanjing Univ Posts & Telecommun, Inst Adv Mat, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, 9 Wenyuan Rd, Nanjing 210023, Jiangsu, Peoples R China

[8] Northwestern Polytech Univ, Shaanxi Inst Flexible Elect, 127 West Youyi Rd, Xian 710072, Shaanxi, Peoples R China

来源：

NATURE COMMUNICATIONS | 2018年 / 9卷

基金：

瑞典研究理事会; 中国国家自然科学基金;

关键词：

ORGANOLEAD TRIHALIDE PEROVSKITES; ELECTRIC-FIELD; HALIDE PEROVSKITE; QUANTUM-WELLS; PHOTOLUMINESCENCE; LUMINESCENCE; MOBILITIES;

D O I：

10.1038/s41467-018-03049-7

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Efficiency roll-off is a major issue for most types of light-emitting diodes (LEDs), and its origins remain controversial. Here we present investigations of the efficiency roll-off in perovskite LEDs based on two-dimensional layered perovskites. By simultaneously measuring electroluminescence and photoluminescence on a working device, supported by transient photoluminescence decay measurements, we conclude that the efficiency roll-off in perovskite LEDs is mainly due to luminescence quenching which is likely caused by non-radiative Auger recombination. This detrimental effect can be suppressed by increasing the width of quantum wells, which can be easily realized in the layered perovskites by tuning the ratio of large and small organic cations in the precursor solution. This approach leads to the realization of a perovskite LED with a record external quantum efficiency of 12.7%, and the efficiency remains to be high, at approximately 10%, under a high current density of 500 mA cm(-2).

引用

页数：7

共 35 条

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