Sensitization of Er emission by Si nanoclusters (Si-nc) is investigated with pulsed and continuous optical pumping, in and off resonance with excited states of Er3+ ion. We show that under high-power pulsed pumping, the excitation process is limited by the finite energy transfer time from Si-nc to Er3+ ions. By comparison between pulsed and steady-state excitation, the concentration of sensitizers and average number of Er3+ ions coupled to a single nanocluster are independently determined in an experiment. The results clarify conditions needed for efficient sensitization of SiO2:Er by Si-nc.
|Titolo:||Sensitization of Er luminescence by Si nanoclusters|
|Data di pubblicazione:||2004|
|Citazione:||Sensitization of Er luminescence by Si nanoclusters / M. WOJDAK; M. KLIK; M. FORCALES; O.B. GUSEV; T. GREGORKIEWICZ; D. PACIFICI; G. FRANZO'; PRIOLO F; F. IACONA. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 69:23(2004), pp. 233315-1-4.|
|Appare nelle tipologie:||1.1 Articolo in rivista|