Anti-Stokes photoluminescence from CsPbBr3 nanostructures embedded in a Cs4PbBr6 crystal

Yuto Kajino, Shuji Otake, Takumi Yamada, Kazunobu Kojima, Tomoya Nakamura, Atsushi Wakamiya, Yoshihiko Kanemitsu, Yasuhiro Yamada

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Lead halide perovskites possess high photoluminescence (PL) efficiency and strong electron-phonon interactions, and therefore optical cooling using up-conversion PL has been expected. We investigate anti-Stokes PL from green-luminescent Cs4PbBr6, whose origin is attributable to CsPbBr3 nanostructures embedded in a Cs4PbBr6 crystal. Because of the high transparency, low refractive index, and high stability of Cs4PbBr6, the green PL displays high external quantum efficiency without photodegradation. Time-resolved PL spectroscopy reveals the excitonic behaviors in the recombination process. The shape of the PL spectrum is almost independent of excitation photon energy, which means that the spectral width is determined by homogeneous broadening. We demonstrate that the phonon-assisted process dominates the Urbach tail of optical absorption and anti-Stokes PL at room temperature. Anti-Stokes PL is observed down to 70 K. We determine the temperature dependence of the Urbach energy and estimate the strength of the electron-phonon coupling. Our spectroscopic data show that CsPbBr3 nanostructures have potentially useful features for optical cooling.

Original languageEnglish
Article numberL043001
JournalPhysical Review Materials
Volume6
Issue number4
DOIs
Publication statusPublished - Apr 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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