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Hybrid perovskite nanoparticles boost luminescence yield by 80 percent

Hybrid perovskite nanoparticles boost luminescence yield by 80 percent

Technology News |
By eeNews Europe



The research also proved the nanoparticles exhibit high stability under ultraviolet visible light.

Early in 2014, scientists reported having obtained the first CH3NH3PbBr3 nanoparticles, soluble in organic solvents and with a 20% luminescence yield. Professor Julia Pérez explains that, first, the strategy for preparing these nanoparticles was to confine the perovskite structure with long-chain ammonium bromide salts. In collaboration with researcher from the University of Valencia Henk Bolink, also a member of ICMol, which is located on the University of Valencia Science Park, the researchers prepared thin films with these nanoparticles and measured their electroluminescence, which was ten times greater than that of the bulk material. The luminescence yield of these nanoparticles, either in dispersion or in film, was close to 20%.

The team led by Professor Julia  Pérez-Prieto set out to improve the luminescent performance of the nanoparticles by decreasing surface defects through a better coating. As revealed in the paper published in the ‘Journal of Materials Chemistry A’, the researchers have managed to obtain nanoparticles with improved solubility and outstanding luminescence by fine-tuning the molar ratios of the components used in the preparation of this material (ammonium salt and lead bromide).

Lead halide hybrid perovskites have an ability to absorb light in the ultraviolet-visible spectrum, their luminescence and electrical conductivity which are desirable properties for photovoltaic applications. Preparing perovskites as small nanoparticles (with a diameter of less than ten nanometres) allows them to disperse in a non-aqueous medium, which facilitates their processing and, thereby, their future use in solar cells and luminescent materials. The most extensively studied lead perovskite is iodide perovskite because of the material’s ability to absorb light in the visible spectrum. However, bromide-based perovskites have been proved to be less moisture-sensitive.

Reference:

Soranyel González-Carrero, Raquel E. Galián, Julia Pérez-Prieto, ‘Maximizing the emissive properties of CH3NH3PbBr3 perovskite nanoparticles’, Journal of Materials Chemistry A, 2015, DOI: 10.1039/C4TA05878J

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