Unveiling dual emission phenomena in NdCl3 doped Cs2SnCl6 perovskite: A comprehensive luminescence investigation

In this study, we address a critical challenge in the field of lead-free double halide perovskites (DHP) for optoelectronic applications. The focus of our investigation centers on the regulation of charge carriers in lead-free DHP to improve their conversion efficiency. To achieve this, we introduce a chemically treated perovskite nanocrystal (NC) capable of generating efficient blue light-emitting devices (LEDs) via doping with trivalent lanthanide halide neodymium (III) chloride (NdCl3). Characterization techniques including Rietveld refinement and Scanning Electron Microscope (SEM) imaging confirm the synthesized nanoparticles' cubic crystal phase and retained octahedral morphology post-NdCl3 addition respectively. Density Functional Theory (DFT) calculations corroborate a direct bandgap, aligned with optical absorption spectra, revealing a reduction in the bandgap at an optimal Nd3+ incorporation. The NdCl3 doped NCs exhibit light blue emission centered at 472 nm with a notable photoluminescence quantum yield (PLQY) of 35 %. Implicit in our findings is the intrinsic novelty of this study, where we not only address the longstanding problem of charge carrier recombination in lead-free DHP but also pioneer a solution that holds great promise for enhancing their overall efficiency. By shedding light on the dual Photoluminescence (PL) emission properties of NdCl3 doping in Cs2SnCl6. This work contributes significantly to the advancement of environmentally friendly and efficient optoelectronic materials, marking a paradigm shift in the field.