High photoluminescence quantum yield near-infrared emission from a lead-free ytterbium-doped double perovskite

Minh N. Tran, Iver J. Cleveland, Joseph R. Geniesse, Eray S. Aydil

Research output: Contribution to journalArticlepeer-review

Abstract

When excited by photons with energies greater than 2.2 eV, the bandgap energy, Yb-doped Cs2AgBiBr6 thin films synthesized via physical vapor deposition emit strong near-infrared luminescence centered at ∼1.24 eV via the Yb3+ 2F5/22F7/2 electronic transition. Robust, reproducible, and stable photoluminescence quantum yields (PLQY) as high as 82.5% are achieved with Cs2AgBiBr6 films doped with 8% Yb. This high PLQY indicates facile and efficient energy transfer from the perovskite host, Cs2AgBiBr6, to Yb, making Cs2AgBiBr6 the most promising lead-free down-conversion material.

Original languageEnglish (US)
JournalMaterials Horizons
DOIs
StateAccepted/In press - 2022

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Process Chemistry and Technology
  • Electrical and Electronic Engineering

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