Issue 41, 2021

Enhanced blue photoluminescence and photostability of Cs3Bi2Br9 perovskite quantum dots via surface passivation with silver ions

Abstract

Lead halide perovskite quantum dots (QDs) with color tunability and narrow-band emissions are promising materials of nanophotonic and photoelectronic fields, but the lead toxicity and instability limit their practical applications. On the other hand, lead-free perovskite QDs suffer from the disadvantages of low photoluminescence quantum yields (PLQYs) and poor stability. Here, we demonstrate a green and facile method to synthesize a lead-free perovskite of Cs3Bi2Br9 QDs with greatly improved optical properties and stability. With the introduction of Ag ions, the PLQY of the as-synthesized Cs3Bi2Br9 QDs has been enhanced by 3.93 times, showing a blue emission at 413 nm. We suggest that the introduced Ag(I) complex fixes the bromide on the Cs3Bi2Br9 QD surface, reduces the surface trap density, and thus efficiently passivates the surface. This passivation effect also regulates the exciton recombination process and leads to the increased probability of radiative deactivation. TEM and XPS analyses confirm the existence of Ag atoms on the surface of Cs3Bi2Br9 QDs. Moreover, the effective passivation also improves the photostability of Cs3Bi2Br9 QDs, resulting in 90% PL intensity being retained after 80 min of UV illumination under ambient conditions. We believe that the method used here provides an effective strategy to improve the fluorescence efficiency of lead-free perovskite QDs, which will create opportunities for their applications in lighting and displays.

Graphical abstract: Enhanced blue photoluminescence and photostability of Cs3Bi2Br9 perovskite quantum dots via surface passivation with silver ions

Supplementary files

Article information

Article type
Paper
Submitted
01 aug 2021
Accepted
09 sep 2021
First published
10 sep 2021

CrystEngComm, 2021,23, 7219-7227

Enhanced blue photoluminescence and photostability of Cs3Bi2Br9 perovskite quantum dots via surface passivation with silver ions

T. Li, J. Ma, M. Qiao, Y. Kuang, Y. He, X. Ran, L. Guo and X. Wang, CrystEngComm, 2021, 23, 7219 DOI: 10.1039/D1CE01006A

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