Discovering the Link between Electrochemiluminescence and Energy Transfer Pathways for Mn-Doped CsPbCl3 Quantum Dot Films

Electrochemiluminescence (ECL) of Mn-doped CsPbCl3 perovskite quantum dot (MPQ) films was investigated for the first time. The electrochemical properties of the perovskite quantum dots are probed by cyclic voltammetry and spooling ECL spectroscopy. It has been discovered that the ECL of the MPQ/benzoyl peroxide coreactant system proceeds through two channels: an energy transfer process from the band-edge exciton to Mn2+, producing emission centered at 595 nm from Mn2+ d–d transition, and a second emission peak centered at 660 nm, which is of a surface-state origin. This observation is drastically different from the frequently reported photoluminescence (PL) of MPQ, which contains dual emission from the host and the dopant, respectively. ECL of the undoped CsPbCl3 (UPQ) was also investigated, and the presence of the 660 nm peak further supports our proposed surface-state emission scheme.