Abstract
The low-temperature photoluminescence of AgBr nanocrystals (NC's) in glass has been examined. The wavelength of the indirect exciton emission and transmission electron micrographs indicate that various samples were fabricated with nanocrystal radii ranging from 3 to 20 nm. Optically detected magnetic resonance spectra for the larger NC's exhibit the normal donor, acceptor, and intermediate case exciton resonances. Optically detected magnetic resonance spectra of the small NC's displayed only a single resonance at the average of the bulk intermediate case exciton values. This collapse is attributed to a confined wave function of the donor, which has a larger exchange interaction with the acceptor increasing the singlet triplet splitting.
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