Magnetic hyperfine modulation of dye-sensitized delayed fluorescence in organic crystals
Abstract
Magnetic fields on a hyperfine scale can modulate dye-sensitized delayed fluorescence from organic crystals at room temperature. This hyperfine modulation (HFM) has been found to depend on the orientation of the field in the ac plane of rhodamine-B-sensitized anthracene. The anisotropy can be explained by an electron-hole spin-spin interaction in the dye-anthracene charge-transfer state formed following photoexcitation of the sensitizing dye on the crystal surface. Increased dye concentration broadens the field-dependence curve, presumably as a result of dye-aggregation effects. HFM has also been found in other dye-crystal systems.
- Publication:
-
Physical Review B
- Pub Date:
- March 1974
- DOI:
- 10.1103/PhysRevB.9.2655
- Bibcode:
- 1974PhRvB...9.2655G