Intramolecular triplet energy transfer in two-dimensional hybrid perovskite nanosheets

Abstract A series of two-dimensional hybrid perovskite nanosheets containing organic triplet energy acceptor, (NEA)2PbBr4−xIx(NEA = C12H11NH3), were synthesized. Steady-state and transient spectra show that nanosheets with the appropriate energy level, the intramolecular triplet energy transfer will occur across the inorganic/organic interface. The first step of triplet energy transfer is the transfer of holes from inorganic part to organic part, and the rate is 1.55 × 10 12 s - 1 in (NEA)2PbBr4 nanosheets. Then the electron transfer with rate of 5.5 × 10 10 s - 1 takes place to complete the triplet energy transfer process.