Luminescence regulation of rare-earth based double perovskites by doping and applications

Metal halide double perovskites (DPs) exhibit tunable band gaps and excellent environmental stability, making them widely applicable in many fields such as solar cells, anti-counterfeiting, and light-emitting diodes. However, traditional DPs have consistently faced challenges in terms of luminescence modulation and high photoluminescence quantum yields. Rare-earth based DPs, known for excellent photophysical properties and the rich energy levels of rare-earth ions, offer significant potential to address these challenges. DPs By doping in rare-earth based DPs, it is possible to achieve controlable luminescence, enhanced luminescence efficiency, and multi-mode emission, etc. This Review summarizes recent developments in the synthetic methods, photophysical properties, multifunctional applications, and existing issues of further development and applications DPs.