High-Quality All-Inorganic Perovskite CsPbBr 3 Quantum Dots Emitter Prepared by a Simple Purified Method and Applications of Light-Emitting Diodes

Ching-Ho Tien, Lung-Chien Chen, Kun-Yi Lee, Zong-Liang Tseng, Yu-Shen Dong and Zi-Jun Lin
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Ching-Ho Tien: Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Lung-Chien Chen: Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Kun-Yi Lee: Department of Electrical Engineering, China University of Science and Technology, Taipei 11581, Taiwan
Zong-Liang Tseng: Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
Yu-Shen Dong: Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Zi-Jun Lin: Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan

Energies, 2019, vol. 12, issue 18, 1-13

Abstract: High-quality perovskite CsPbBr 3 quantum dots (QDs-CsPbBr 3 ) were prepared using the ultrasonic oscillation method, which is simple and provides variable yield according to requirements. The emission spectra over a large portion of the visible spectral region (450–650 nm) of QD-CsPbX 3 (X = Cl, Br, and I) have tunable compositions that can be halide exchanged using the halide anion exchange technique and quantum size-effects. A strong peak with high intensity of (200) lattice plane of purified QDs-CsPbBr 3 film is obtained, confirming the formation of an orthorhombic perovskite crystal structure of the Pnma space group. The photoluminescence of QDs-CsPbBr 3 was characterized using a narrow line-width emission of 20 nm, with high quantum yields of up to 99.2%, and radioactive lifetime increasing to 26 ns. Finally, through the excellent advantages of QDs-CsPbBr 3 mentioned above, purified perovskite QDs-CsPbBr 3 as an active layer was utilized in perovskite quantum dot light-emitting diodes structure applications. As a result, the perovskite QDs-CsPbBr 3 light-emitting diodes (LEDs) exhibits a turn-on voltage of 7 V and a maximum luminance of 5.1 cd/m 2 .

Keywords: all-inorganic halide perovskite; quantum dots; perovskite CsPbBr 3; quantum dot light-emitting diodes (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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