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High-Quality All-Inorganic Perovskite CsPbBr3 Quantum Dots Emitter Prepared by a Simple Purified Method and Applications of Light-Emitting Diodes

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Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
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Department of Electrical Engineering, China University of Science and Technology, Taipei 11581, Taiwan
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Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
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Authors to whom correspondence should be addressed.
Energies 2019, 12(18), 3507; https://doi.org/10.3390/en12183507
Received: 7 August 2019 / Revised: 5 September 2019 / Accepted: 6 September 2019 / Published: 11 September 2019
High-quality perovskite CsPbBr3 quantum dots (QDs-CsPbBr3) 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-CsPbX3 (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-CsPbBr3 film is obtained, confirming the formation of an orthorhombic perovskite crystal structure of the Pnma space group. The photoluminescence of QDs-CsPbBr3 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-CsPbBr3 mentioned above, purified perovskite QDs-CsPbBr3 as an active layer was utilized in perovskite quantum dot light-emitting diodes structure applications. As a result, the perovskite QDs-CsPbBr3 light-emitting diodes (LEDs) exhibits a turn-on voltage of 7 V and a maximum luminance of 5.1 cd/m2. View Full-Text
Keywords: all-inorganic halide perovskite; quantum dots; perovskite CsPbBr3; quantum dot light-emitting diodes all-inorganic halide perovskite; quantum dots; perovskite CsPbBr3; quantum dot light-emitting diodes
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Tien, C.-H.; Chen, L.-C.; Lee, K.-Y.; Tseng, Z.-L.; Dong, Y.-S.; Lin, Z.-J. High-Quality All-Inorganic Perovskite CsPbBr3 Quantum Dots Emitter Prepared by a Simple Purified Method and Applications of Light-Emitting Diodes. Energies 2019, 12, 3507.

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