All-Inorganic Quantum-Dot LEDs Based on a Phase-Stabilized α-CsPbI3 Perovskite

Wang，Ya Kun1,2; Yuan，Fanglong1,3; Dong，Yitong1; Li，Jiao Yang2; Johnston，Andrew1; Chen，Bin1; Saidaminov，Makhsud I.1,7; Zhou，Chun1; Zheng，Xiaopeng4; Hou，Yi1; Bertens，Koen1; Ebe，Hinako1; Ma，Dongxin1; Deng，Zhengtao1,5; Yuan，Shuai2; Chen，Rui6; Sagar，Laxmi Kishore1; Liu，Jiakai4; Fan，James1; Li，Peicheng3; Li，Xiyan1; Gao，Yuan1; Fung，Man Keung2; Lu，Zheng Hong3; Bakr，Osman M.4; Liao，Liang Sheng2; Sargent，Edward H.1

2021-07-12

10.1002/anie.202104812

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   Impact Factor & Quartile

1433-7851

1521-3773

The all-inorganic nature of CsPbI perovskites allows to enhance stability in perovskite devices. Research efforts have led to improved stability of the black phase in CsPbI films; however, these strategies—including strain and doping—are based on organic-ligand-capped perovskites, which prevent perovskites from forming the close-packed quantum dot (QD) solids necessary to achieve high charge and thermal transport. We developed an inorganic ligand exchange that leads to CsPbI QD films with superior phase stability and increased thermal transport. The atomic-ligand-exchanged QD films, once mechanically coupled, exhibit improved phase stability, and we link this to distributing strain across the film. Operando measurements of the temperature of the LEDs indicate that KI-exchanged QD films exhibit increased thermal transport compared to controls that rely on organic ligands. The LEDs exhibit a maximum EQE of 23 % with an electroluminescence emission centered at 640 nm (FWHM: ≈31 nm). These red LEDs provide an operating half-lifetime of 10 h (luminance of 200 cd m) and an operating stability that is 6× higher than that of control devices.

CsPbI3 quantum dots inorganic ligand exchange perovskite LEDs pure red emission strain engineering

SCI ; EI

English

NI Journal Papers ; ESI Highly Cited Papers ; NI论文

Others

WOS:000661295800001

20212510515714

Electroluminescence ; Lead compounds ; Ligands ; Nanocrystals ; Perovskite ; Phase stability ; Quantum chemistry ; Semiconductor doping ; Semiconductor quantum dots ; Thin films

Minerals:482.2 ; Semiconducting Materials:712.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Light, Optics and Optical Devices:741 ; Nanotechnology:761 ; Physical Chemistry:801.4

CHEMISTRY

2-s2.0-85107981010

Scopus

1.Department of Electrical and Computer Engineering,University of Toronto,Toronto,10 King's College Road,M5S 3G4,Canada
2.Institute of Functional Nano & Soft Materials (FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices,Soochow University,Jiangsu,Suzhou,215123,China
3.Department of Materials Science and Engineering,University of Toronto,Toronto,184 College Street,M5S 3G4,Canada
4.Division of Physical Sciences and Engineering,King Abdullah University of Science and Technology (KAUST),Thuwal,23955-6900,Saudi Arabia
5.College of Engineering and Applied Sciences,State Key Laboratory of Analytical Chemistry for Life Science,Nanjing University,Nanjing,210023,China
6.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
7.Department of Chemistry and Electrical & Computer Engineering,Centre for Advanced Materials and Related Technologies (CAMTEC),University of Victoria,Victoria,Canada

Wang，Ya Kun,Yuan，Fanglong,Dong，Yitong,et al. All-Inorganic Quantum-Dot LEDs Based on a Phase-Stabilized α-CsPbI3 Perovskite[J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION,2021,60(29):16164-16170.

Wang，Ya Kun.,Yuan，Fanglong.,Dong，Yitong.,Li，Jiao Yang.,Johnston，Andrew.,...&Sargent，Edward H..(2021).All-Inorganic Quantum-Dot LEDs Based on a Phase-Stabilized α-CsPbI3 Perovskite.ANGEWANDTE CHEMIE-INTERNATIONAL EDITION,60(29),16164-16170.

Wang，Ya Kun,et al."All-Inorganic Quantum-Dot LEDs Based on a Phase-Stabilized α-CsPbI3 Perovskite".ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 60.29(2021):16164-16170.