Open AccessEnhanced photoluminescence of CsPbBr3-xIx nanocrystals via plasmonic Au nanoarrays
Author(s) -
Yangqing Wu,
Qiaoling Han,
Mei Wang,
Fangying Juan,
Guozhi Hou,
Xiaohui Fan,
Haoming Wei,
Jun Xu,
Bingqiang Cao
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.443112
Subject(s) - photoluminescence , materials science , nanocrystal , plasmon , surface plasmon resonance , absorption (acoustics) , perovskite (structure) , optoelectronics , nanosphere lithography , surface plasmon , nanotechnology , nanoparticle , crystallography , chemistry , fabrication , medicine , alternative medicine , pathology , composite material
Large scale ordered Au nanoarrays are fabricated by nanosphere lithography technique. The photoluminescence improvement of CsPbBr 3-x I x nanocrystals by more than three times is realized in the CsPbBr 3-x I x nanocrystal/Au nanoarray/Si structure. Time-resolved photoluminescence decay curves indicate that the lifetime is decreased by introducing the Au nanoarrays, which results in a increasing radiation recombination rate. The reflection spectra with two major valleys (the dip in the curve) located at ∼325 nm and 545 nm of Au nanoarray/Si structure, which illustrates two plasmonic resonance absorption peaks of the Au nanoarrays. The enhancement of photoluminescence is ascribed to a well match between the excitation/emission of CsPbBr 3-x I x nanocrystals and localized surface plasmon/gap plasmon resonance absorption of the ordered Au nanoarrays, as also revealed from the finite-difference time-domain simulation analysis. Our work offers an effective strategy to improve the fluorescence of perovskite nanocrystals and provide the potential for further applications.