Stability of CsNaBiBr and CsNaBiCl.

Bismuth-based halide perovskites are nontoxic alternatives to widely studied lead-based perovskites for optoelectronic applications. Here, we synthesized CsNaBiCl thin films and attempted to synthesize CsNaBiBr using physical vapor deposition. While CsNaBiCl forms a stable cubic structure with a 3.

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

When excited by photons with energies greater than 2.2 eV, the bandgap energy, Yb-doped CsAgBiBr thin films synthesized physical vapor deposition emit strong near-infrared luminescence centered at ∼1.24 eV the YbF → F electronic transition.