Revealing the effect of electrochemical switching and energy transfer on the electrochemiluminescence of Mn-doped CsPbCl3 nanocrystals

The electrochemical behavior and consequent luminescence properties of Mn-doped CsPbCl3 perovskite (Mn:CsPbCl3) nanocrystals (NCs) were investigated by cyclic voltammetry (CV) and electrochemiluminescence (ECL) measurements. Mn:CsPbCl3 NCs could be electrochemically injected with electrons or holes at different potentials to produce ECL through both annihilation and coreactant routes. Importantly, it has been found that the ECL involving the coreactant could originate from two pathways: energy recombination at the surface, and energy transfer from the excited CsPbCl3 host to the dopant center, producing emission via Mn d-d transition, which is different from the photoluminescence (PL) of Mn:CsPbCl3 NCs alone, which contains dual emissions from both the host and the dopant.