Off-resonant spectral hole burning in CaS:Eu by time-varying Coulomb fields
- 15 November 1997
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 56 (20), 12992-12997
- https://doi.org/10.1103/physrevb.56.12992
Abstract
Persistent spectral hole burning has been observed on the zero-phonon lines of the main site and several perturbed sites of in CaS:Eu single crystals. Hole burning occurs by two-step photoionization, can be strongly gated with IR irradiation, and takes place by excited-state absorption from the metastable excited state to the conduction band followed by electron transport to centers which are the dominant traps. A complex hole structure consisting of a narrow feature (200 MHz), and broader features ( and ) is observed. A mechanism is described for the occurrence of these unusually broad features. Time-varying internal electric fields which occur during the hole burning due to photoionization and trapping can lead to burning of holes at frequencies non-resonant with that of the laser. In addition, a mechanism for hole erasure, tunneling between Eu ions, is demonstrated. This mechanism is identified from the frequency dependence of the hole erasure which follows the absorption, and the linear dependence of the photoconductivity and hole erasure efficiency on irradiation power, both of which indicate erasure in a single-photon process.
Keywords
This publication has 10 references indexed in Scilit:
- Optical and photoconductive properties of cerium-doped crystalline solidsJournal of Luminescence, 1996
- Spectral hole burning ofin CaPhysical Review B, 1996
- Rare-earth calcium sulfide phosphors for cathode-ray tube displaysJournal of Alloys and Compounds, 1995
- Influence of Eu concentration on recombination processes in CaS : Eu2+ thin filmsJournal of Luminescence, 1994
- Optical recombination mechanisms in Eu2+-doped CaS and SrS thin filmsJournal of Applied Physics, 1993
- Photoluminescence of Eu2+ and Eu3+ Centers in CaS:Eu,Na PhosphorsJapanese Journal of Applied Physics, 1993
- Valence State of Europium in CaS Prepared Using Alkaline Polysulfide FluxJapanese Journal of Applied Physics, 1992
- Temperature effects in the emission characteristics of CaS:Eu thin-film electroluminescent devicesJournal of Crystal Growth, 1992
- Energy transfer and anomalous electrical properties of optically excited rubyJournal of Luminescence, 1987
- Optical Properties of Alkaline-Earth Chalcogenides. I. Single Crystal Growth and Infrared Reflection Spectra Due to Optical PhononsJournal of the Physics Society Japan, 1982