Pair generation of Ge electron centers and self-trapped hole centers inglasses by KrF excimer-laser irradiation
- 1 September 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 60 (10), 7166-7169
- https://doi.org/10.1103/physrevb.60.7166
Abstract
Formation processes of paramagnetic centers in glasses by irradiation with KrF excimer-laser pulses (5 eV) were investigated at 77 K using electron-spin resonance (ESR). The essential photochemical reaction was the pair generation of electron-trapped centers associated with fourfold coordinated Ge ion (GEC) and self-trapped hole centers of bridging oxygen (STH). This reaction proceeds by band-to-band excitation via two-photon absorption process. A part of GEC was converted to center during prolonged irradiation at 77 K. The difference between ESR spectra before and after annealing at room temperature revealed that the majority of STH disappears by recombination with GEC (or during annealing at room temperature. The dominant paramagnetic centers remaining after annealing were GEC and and their total concentration was approximately 50% of those before annealing. The intimate relation between the generation of paramagnetic centers and the decay of emission due to suggested that the hole transfer from STH to is followed by their structural relaxation.
Keywords
This publication has 21 references indexed in Scilit:
- Defect formation in Si:Geglasses studied by irradiation with excimer laser lightPhysical Review B, 1996
- Laser-power dependence of absorption changes in Ge-dopedglass induced by a KrF excimer laserPhysical Review B, 1996
- Correlation between Ge E′ Centers and Optical Absorption Bands in SiO2:GeO2 GlassesJapanese Journal of Applied Physics, 1996
- Photochemical reactions in-glasses induced by ultraviolet irradiation: Comparison between Hg lamp and excimer laserPhysical Review B, 1995
- Ultraviolet-radiation-induced chemical reactions through one-and two-photon absorption processes in GeO_2–SiO_2 glassesOptics Letters, 1995
- UV induced densification during Bragg grating inscription in Ge:SiO2 preformsOptical Materials, 1995
- Dynamic and orientational behavior of UV-induced luminescence bleaching in Ge-doped silica optical fiberOptics Letters, 1993
- Observations of changes in UV absorption bands of singlemode germanosilicate core optical fibres on writing and thermally erasing refractive index gratingsElectronics Letters, 1992
- On the Structure of Ge-Associated Defect Centers in Irradiated High Purity GeO2 and Ge-Doped SiO2 GlassesDefect and Diffusion Forum, 1987
- Fundamental Defect Centers in Glass: The Peroxy Radical in Irradiated, High-Purity, Fused SilicaPhysical Review Letters, 1979