How Does Local Strain Affect Stokes Shifts in Halide Double Perovskite Nanocrystals?

Saar Shaek, Sasha Khalfin, Emma Hasina Massasa, Arad Lang, Shai Levy, Lotte T.J. Kortstee, Betty Shamaev, Shaked Dror, Rachel Lifer, Reut Shechter, Yaron Kauffmann, Rotem Strassberg, Iryna Polishchuk, Andrew Barnabas Wong, Boaz Pokroy, Ivano E. Castelli, Yehonadav Bekenstein

Research output: Contribution to journalArticlepeer-review


Lead-free perovskite nanocrystals are of interest due to their nontoxicity and potential application in the display industry. However, engineering their optical properties is nontrivial and demands an understanding of emission from both self-trapped and free excitons. Here, we focus on tuning silver-based double perovskite nanocrystals’ optical properties via two iso-valent dopants, Bi and Sb. The photoluminescence quantum yield of the intrinsic Cs2Ag1-yNayInCl6 perovskite increased dramatically upon doping. However, the two dopants affect the optical properties very differently. We hypothesize that the differences arise from their differences in electronic level contributions and ionic sizes. This hypothesis is validated through absorption and temperature dependence photoluminescence measurements, namely, by employing the Huang-Rhys factor, which indicates the coupling of the exciton to the lattice environment. The larger ionic size of Bi also plays a role in inducing significant microstraining verified via synchrotron measurements. These differences make Bi more sensitive to doping concentration over antimony which displays brighter emission (QY ∼40%). Such understanding is important for engineering optical properties in double perovskites, especially in light of recent achievements in boosting the photoluminescence quantum yield.

Original languageEnglish
Pages (from-to)9064-9072
Number of pages9
JournalChemistry of Materials
Issue number21
StatePublished - 14 Nov 2023

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


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