The enigma of Mn emission is not over!
Pradeep KR a, Ranjani Viswanatha a
a Jawaharlal Nehru Centre For Advanced Scientific Research, JNCASR, Jakkur, Bengaluru-560064, India, Bengaluru, India
Online Conference
Proceedings of Internet Conference for Quantum Dots (iCQD)
Online, Spain, 2020 July 14th - 17th
Organizers: Quinten Akkerman, Raffaella Buonsanti, Zeger Hens and Maksym Kovalenko
Poster, Pradeep KR, 089
Publication date: 3rd July 2020

Metal halide perovskite crystal structures have emerged as a class of optoelectronic materials with excellent optical absorption and emission qualities. The tunability of optical properties by composition modulation gives a unique advantage for these lead halide perovskite QDs. Traditionally, novel functionalities in II-VI QDs have been achieved using impurity doping, wherein impurity related PL, magnetism is known to modify the host properties. Extension of Mn doping into metal halide perovskites have shown much cleaner dopant related emission arising at 590 nm due to Mn2+ d-d transition with a single exponential decay.  However, though the most commonly studied dopant to date is Mn2+, the absorption and emission mechanism is still controversial. Perovskite materials shown to be unaffected by the presence of surface states and providing a single pathway for the decay of the excited electron provides the least complicated path to enhance our understanding of the controversial emission mechanism. In this work, we studied the mechanism of energy transfer from host to dopant.  This understanding is critical for the design of any Mn dopant based optoelectronic applications.




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