Leyre Gomez1 Chris de Weerd1 Tom Gregorkiewicz1

1, Institute of Physics, Amsterdam, , Netherlands

The advantages of quantum dots (quantum-confinement effects) and perovskites (high emission efficiencies and low production costs) are combined in all-inorganic cesium lead halide perovskite nanocrystals (IP-NCs, CsPbX3 with X = Cl, Br, I) – a new promising material for photovoltaic and optoelectronic applications. CsPbX3 colloidal nanocrystals dispersed in non-polar solvents show high quantum photoluminescence yields of 50-90%, narrow emission bands, and emission tunability along the whole visible spectrum. However, this material presents two main drawbacks: (i) IP-NCs are breakable in polar solvents, and (ii) different emission color IP-NCs cannot be mixed or exposed together because they suffer halide exchange which brings to composition homogenization. In order to enhance their properties, we report on the successful encapsulation of IP-NCs in solid lipid structures of stearic acid. The encapsulated IP-NCs remain stable for a period longer than 2 months and anion-exchange is fully arrested. In this way, an easy-to-handle material, with a non-toxic carrier and free from organic solvents has been obtained, increasing the application fields for IP-NCs toward, e.g., ink-jet printing for optoelectronics or security markers and imaging applications with different colors to cover the human eye spectral range.