Luminescence properties and energy transfer mechanism in Mn-doped two-dimensional perovskite(PMA)2PbBr4
Through manganese doping,the luminescence wavelength of perovskite can be adjusted to improve its quantum yield.In this paper,Mn2+ doping was lead into two-dimensional perovskite(PMA)2PbBr4 and the luminescence properties and energy transfer mechanism in Mn-doped two-dimensional perovskite(PMA)2PbBr4 were studied.The results show that after manganese doping,the exciton recombination luminescence peak(419 nm)of the original two-dimensional perovskite changed into a transition(608 nm)between the Mn2+ orbital 4T1→6A1,in which an effective energy transfer occurred.The introduction of Mn2+ leads to a certain degree of lattice distortion,and then the exciton lifetime decreases(from 6.51 ns to 0.30 ns);at the same time,the luminescence lifetime brought by Mn2+ is not sensitive to the doping concentration(0.23 ms),because the luminescence corresponds to the transition between 4T1 and 6A1 of Mn2+ at this time.After manganese doping,its optical stability has also been significantly improved.Therefore,manganese doping is an effective means to adjust the wavelength or bandwidth of two-dimensional perovskite and improve the luminous efficiency,which provides the possibility for the application of two-dimensional perovskite in white light lighting.
two-dimensional perovskitemanganese dopingluminous mechanismenergy transfer mechanism
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