Abstract
The energy transfer from Si nanocrystals (Si-nc’s) to Er ions was studied spectroscopically. At low temperatures, inhomogeneously broadened photoluminescence bands of Si-nc’s were partially quenched and some dips were observed. A comparison of the quenched spectra with a photoluminescence excitation spectrum revealed that the dips are due to the resonant energy transfer from excitons in Si-nc’s to Er ions. For the energy transfer to the state of Er ions, two dips, one very clear and the other indistinctive, were observed, while to the state, two dips with comparable depth were observed. Modification of the band structure of Si-nc’s by the quantum size effects is responsible for the different dip structures, depending on to which states the energy transfer is made.
- Received 8 November 2004
DOI:https://doi.org/10.1103/PhysRevB.71.193301
©2005 American Physical Society