Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.027
Publication date: 7th February 2022
Lead (Pb) halide based perovskites nanocrystals show outstanding optoelectronic properties. But Pb-toxicity remains an issue for their widespread application. Therefore, search for Pb-free metal halide perovskites is natural. The fundamental question is how to identify alternative metal halides that could replicate optoelectronic properties of the Pb-halide perovskites.[1,2] I will address this question in the first part of my talk. Unfortunately, till date, Pb-free perovskites could not compete with optoelectronic properties Pb-halide perovskites. Why so? This question will also be discussed in the talk. Finally, in the last 3-4 years, we changed the goal post of our research. Instead of attempting to replicate the optoelectronic properties of Pb-halide perovskites, we started to explore newer directions. For example, we dope lanthanides like Yb3+ and Er3+ in Cs2AgInCl6 double perovskites to develop short-wave-infrared (SWIR) light emitting materials.[3] Furthermore, doping and/or codoping ions like Bi3+ and Sb3+ (that has two electrons in the outermost s-orbiatl) tailor both optical excitation and emission in the UV-visible region.[4,5] In the last part of my talk, I will discuss about such exploration.
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