Jump to main content
Jump to site search

Issue 47, 2019
Previous Article Next Article

CsPbBr3–Cs4PbBr6 composite nanocrystals for highly efficient pure green light emission

Author affiliations

Abstract

All-inorganic perovskite CsPbBr3–Cs4PbBr6 composite nanocrystals (NCs) were synthesized via a convenient solution process without inert gas protection and systematically studied as green phosphors for light emitting diode (LED) applications. While colloidal composite NCs emit green color with an emission peak at around 515 nm, their thin films on top of blue GaN chips exhibit a redshift of ∼15–20 nm due to subsequential aggregation in solid state. The Commission Internationale De I'eclairage (CIE) chromaticity coordinates of the green LEDs assembled by composite NCs reached (0.201, 0.746) with nearly 100% green ratio. Moreover, the pure green LED displayed a luminous efficiency of 45 lm W−1 under 10 mA driving current. The colloidal CsPbBr3–Cs4PbBr6 composite NCs have the photoluminescence quantum yield (PLQY) as high as 74%. The high PLQY originates from cubic CsPbBr3 NCs well passivated by the zero-dimensional Cs4PbBr6 matrix, substantially suppressing the nonradiative recombination. The comparison between the green LEDs fabricated with pure and composite perovskites imply that the CsPbBr3–Cs4PbBr6 composites with higher quantum yield could be an effective way to get the brightness and the stability of pure green LEDs.

Graphical abstract: CsPbBr3–Cs4PbBr6 composite nanocrystals for highly efficient pure green light emission

Back to tab navigation

Publication details

The article was received on 17 Aug 2019, accepted on 11 Nov 2019 and first published on 11 Nov 2019


Article type: Paper
DOI: 10.1039/C9NR07096F
Nanoscale, 2019,11, 22899-22906

  •   Request permissions

    CsPbBr3–Cs4PbBr6 composite nanocrystals for highly efficient pure green light emission

    M. He, C. Wang, J. Li, J. Wu, S. Zhang, H. Kuo, L. Shao, S. Zhao, J. Zhang, F. Kang and G. Wei, Nanoscale, 2019, 11, 22899
    DOI: 10.1039/C9NR07096F

Search articles by author

Spotlight

Advertisements