Abstract
The excited-state structure of impurity-trapped excitons are measured in a multisite system. We use a two-color (UV-IR) pulsed photoluminescence enhancement technique, which probes the interlevel transitions and dynamics of impurity-trapped excitons in doped insulating phosphor materials. The technique is applied to NaMgF:Yb, which exhibits emission from two charge-compensation centers with peaks at 22300 cm (448 nm) and 24000 cm (417 nm). The observed photoluminescence enhancement is caused by a combination of intraexcitonic excitation and electron trap liberation. The electron traps are inferred to have a depth of approximately 800 cm.
4 More- Received 9 April 2013
DOI:https://doi.org/10.1103/PhysRevB.88.104304
©2013 American Physical Society