Lead-free rare-earth-based double perovskite nanocrystals with near-infrared emission

Nanowerk  September 9, 2021
Researchers in China synthesized all-inorganic rare-earth-based Cs2NaEr1−xBxCl6 double perovskite nanocrystals. The Cs2NaErCl6 NCs showed good air stability and emitted a sharp NIR photoluminescence at telecommunication wavelength of 1543 nm and its average lifetime is 35.7 µs. For Cs2NaEr0.5Sb0.5Cl6 nanocrystals NIR photoluminescence could be enhanced 23-fold with the lifetime being 119.1 µs. Femtosecond transient absorption measurements proved that a long-lifetime trap state promotes NIR emitting in the mixed Sb/Er double perovskite nanocrystals…read more. TECHNICAL ARTICLE