Colloidal suspensions of totally inorganic perovskites nanoparticles: A new photoluminescent emission in the near-IR

Abstract

Luminescent materials have attracted great attention due to the amazing applications. In this sense, perovskite halide materials have shown promising luminescent properties which allows them to be useful in various applications such as LEDs, sensors. In this work, colloidal suspensions of CsPbI3 and Pd-doped CsPbI3 perovskite nanoparticles were prepared at different temperatures, and their structure and luminescence properties were characterized to analyse the effect of the synthesis temperature and the Pd-doping. With the increase of temperature, the main photoluminescence band of perovskite nanoparticles are slightly red-shifted. But the most amazing result is that the Pd-doped CsPbI3 shows a new emission band at 877 nm under excitation at 785 nm. Therefore, this compound may be used as a highly sensitive luminescent sensor in several applications, such as in biosystems due to their emission in the first biological window under NIR excitation.