Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.211
Publication date: 16th December 2024
Lead halide perovskite (ABX3) nanocrystals are luminescent nanomaterials of significant interest for applications in displays, solar concentrators, and photodetectors due to their bandgap tunability across the visible spectrum, narrow emission profiles, and high radiative carrier recombination rates.[1] However, their emission properties are not uniform across the visible range. Blue emission remains challenging to achieve, while red emission often suffers from lower efficiency and stability compared to green, posing difficulties for pure perovskite-based white light generation. Porous scaffolds have been employed to fabricate various ligand-free perovskite nanostructures.[2-5] However, scaffold preparation methods have involved only the use of optically passive elements. In this work, we have developed GdVO4:Eu3+ and GdVO4:Dy3+ nanoparticles films with a regular pore size that can be infiltrated with perovskite precursors from the liquid phase. In this context, we prepare CsPbBr3 and Cs4PbBr6 nanocrystals, which emit green and blue light respectively. Upon ultraviolet excitation, Eu3+-doped nanophosphors emit red light, while Dy3+-doped nanophosphors emit light in the blue and yellow regions of the visible spectrum.[6] The combination of perovskite nanomaterials and multifunctional phosphor-based scaffolds enables the fabrication of transparent photoluminescent coatings with tunable spectral emission, controlled by the excitation wavelength. This synergy allows for the generation of white light with customizable hues ranging from warm (2300 K) to neutral (5500 K).
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