Halide Homogenization for High-Performance Blue Perovskite Electrohiminescence

被引：67

作者：

Cheng, Lu ^{[1
,2
]}

Yi, Chang ^{[1
,2
]}

Tong, Yunfang ^{[1
,2
]}

Zhu, Lin ^{[1
,2
]}

Kusch, Gunnar ^{[3
]}

Wang, Xiaoyu ^{[4
,5
]}

Wang, Xinjiang ^{[4
,5
]}

Jiang, Tao ^{[1
,2
]}

Zhang, Hao ^{[1
,2
]}

Zhang, Ju ^{[1
,2
]}

Xue, Chen ^{[6
,7
]}

Chen, Hong ^{[1
,2
]}

Xu, Wenjie ^{[1
,2
]}

Liu, Dawei ^{[1
,2
]}

Oliver, Rachel A. ^{[3
]}

Friend, Richard H. ^{[8
]}

Zhang, Lijun ^{[4
,5
]}

Wang, Nana ^{[1
,2
,8
]}

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

Wang, Jianpu ^{[1
,2
]}

机构：

[1] Nanjing Tech Univ NanjingTech, Key Lab Flexible Elect KLOFE, 30 South Puzhu Rd, Nanjing 211816, Peoples R China

[2] Nanjing Tech Univ NanjingTech, Inst Adv Mat IAM, 30 South Puzhu Rd, Nanjing 211816, Peoples R China

[3] Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England

[4] Jilin Univ, Key Lab Automobile Mat MOE, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China

[5] Jilin Univ, Coll Mat Sci & Engn, Changchun 130012, Peoples R China

[6] Northwestern Polytech Univ, Frontiers Sci Ctr Flexible Elect FSCFE, 127 West Youyi Rd, Xian 710072, Peoples R China

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

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

来源：

RESEARCH | 2020年 / 2020卷

基金：

英国工程与自然科学研究理事会; 中国国家自然科学基金;

关键词：

LIGHT-EMITTING-DIODES; TOTAL-ENERGY CALCULATIONS; EFFICIENT; PASSIVATION; BRIGHT; FILMS;

D O I：

10.34133/2020/9017871

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：

Metal halide perovskite light-emitting diodes (LEDs) have achieved great progress in recent years. However, bright and spectrally stable blue perovskite LED remains a significant challenge. Three-dimensional mixed-halide perovskites have potential to achieve high brightness electroluminescence, but their emission spectra are unstable as a result of halide phase separation. Here, we reveal that there is already heterogeneous distribution of halides in the as-deposited perovskite films, which can trace back to the nonuniform mixture of halides in the precursors. By simply introducing cationic surfactants to improve the homogeneity of the halides in the precursor solution, we can overcome the phase segregation issue and obtain spectrally stable single-phase blue-emitting perovskites. We demonstrate efficient blue perovskite LEDs with high brightness, e.g., luminous efficacy of 4.7, 2.9, and 0.41m W-1 and luminance of over 37,000, 9,300, and 1,300 cd m(-2) for sky blue, blue, and deep blue with Commission Internationale de l'Eclairage (CIE) coordinates of (0.068, 0.268), (0.091, 0.165), and (0.129, 0.061), respectively, suggesting real promise of perovskites for LED applications.

引用

页数：10

共 40 条

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