Publication date: 3rd July 2020
Opto-electronic devices based on all-inorganic perovskite systems are an energy-efficient source of lighting due to their high photoluminescence quantum yield (QY). However, dominant surface trapping continues to plague the field, despite their high defect tolerance, as evidenced by the several fold improvements in the external quantum efficiency of perovskite nanocrystals (NCs) upon appropriate surface passivation or physical confinement between high bandgap materials. Here, we introduce the concept of drip-feeding of photo-excited electrons from an impurity-induced spin-forbidden state to address this major shortcoming. An increased and delayed (about several milliseconds) excitonic QY, and density functional theory establish the electron back-transfer signifying efficient recombination. We term this electron back-transfer from Mn2+ to the host conduction band in this prototypical example of Mn-doped CsPbX3 (X = Cl, Br) NCs through vibrational coupling as Vibrationally Assisted Delayed Fluorescence (VADF).
JNCASR, Bangalore, Sheik Saqr Lab, Department of Science and Technology, Govt. of India
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