The outstanding assets of stability and non-toxicity have produced a surge of research interest into lead-free double perovskite halides for photovoltaic and optoelectronic applications. Here we report the near infrared (NIR) downshifting of micron and nanoparticle (NP)-size erbium-doped Cs2NaBiCl6 under ultraviolet excitation. The 1.54 nm emission of Er3+ is obtained by the population of the 4I13/2 level by an internal Er3+ temperature-dependent cross-relaxation process and also from bismuth energy transfer. The NIR emission can be switched from sharp to broad band by selective excitation. The doped NPs may be dispersed in organic solvents and the emission intensity can be tuned by choice of solvent.
|Number of pages||5|
|Journal||Journal of Materials Chemistry C|
|Early online date||3 Feb 2022|
|Publication status||Published - 28 Feb 2022|
Scopus Subject Areas
- Materials Chemistry