Abstract
Recently, hybrid perovskites have gained attention as sensitizers for molecular triplet generation. Layered, two-dimensional (2D) perovskites are especially well-suited for this purpose because the triplet donor (inorganic framework) and triplet acceptor (organic layer) are self-assembled into adjacent sheets, so that with the appropriate energetics, triplets can be driven across the interface. Here we examine interlayer energy transfer in a series of mixed-halide Dion–Jacobson 2D perovskites containing divalent naphthalene cations. We find that the sensitized phosphorescence in these compounds is dominated by naphthalene triplet excimer emission, but when the inorganic exciton is tuned near resonance with the naphthalene triplet, naphthalene monomer phosphorescence competes with triplet excimer formation. The interlayer energy-transfer process is further revealed by ultrafast transient absorption spectroscopy through kinetic variations in triplet excimer formation times. Ultimately, gaining control over interlayer interactions in 2D perovskites through cation design will help uncover new functions and applications for these materials.
Original language | American English |
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Pages (from-to) | 4793-4798 |
Number of pages | 6 |
Journal | Journal of Physical Chemistry Letters |
Volume | 12 |
Issue number | 20 |
DOIs | |
State | Published - 2021 |
NREL Publication Number
- NREL/JA-5900-79805
Keywords
- 2D perovskite
- energy transfer
- excimer
- low dimensional perovskite
- perovskite
- phosphorescence
- photoluminescence
- solar-photochemistry
- triplet energy transfer
- triplet sensitization