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

Author

Listed:
  • 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)

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 .

Suggested Citation

  • Ching-Ho Tien & Lung-Chien Chen & Kun-Yi Lee & Zong-Liang Tseng & Yu-Shen Dong & Zi-Jun Lin, 2019. "High-Quality All-Inorganic Perovskite CsPbBr 3 Quantum Dots Emitter Prepared by a Simple Purified Method and Applications of Light-Emitting Diodes," Energies, MDPI, vol. 12(18), pages 1-13, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:18:p:3507-:d:266428
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