Intramolecular Triplet Energy Transfer in Two-Dimensional Hybrid Perovskite Nanosheets

A series of two-dimensional hybrid perovskite nanosheets containing organic triplet energy acceptor, (NEA)(2)PbBr4-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 x 10(12) s(-1) in (NEA)(2)PbBr4 nanosheets. Then the electron transfer with rate of 5.5 x 10(10) s(-1) takes place to complete the triplet energy transfer process.