Journalartikel

Jahr der Veröffentlichung: 2001

Zeitschrift: Physical Review B

Bandnummer: 64

Heftnummer: 16

ISSN: 2469-9950

eISSN: 2469-9969

DOI Link: https://doi.org/10.1103/PhysRevB.64.165102

Verlag: American Physical Society

Abstract: 
Electron traps based on regular Pb sites perturbed by oxygen vacancies (V-O) in high purity undoped PbWO4 have been revealed and studied by electron spin resonance (ESR) and thermally stimulated luminescence (TSL) measurements. Detailed analysis of ESR spectra parameters (g factor, hyperfine, and superhyperfine structures) along with the variation of the concentration after annealing in inert and oxygen atmospheres had shown that revealed centers are Pb+-V-O complexes. The Pb+-V-O centers are created in two ways: (i) by direct trapping of the electrons from the conduction band under x-ray or ultraviolet irradiation at T<60 K; (ii) by retrapping of electrons freed from unperturbed (WO4)(3-) centers after irradiation at T<40 K, followed by heating at T=60 K Above T approximate to 180 K, Pb+-VO centers are - thermally ionized, giving rise to a TSL,glow peak due to the recombination of freed electrons with localized holes. The emission spectrum of the TSL features one band peaking at around 2.5 eV. The temperature dependence of both TSL and ESR intensities has been analyzed using a first order recombination model: the thermal ionization energy of Pb+ -V-O centers tuf ns out to be 0.55 eV. The role of Pb+-V-O centers in the processes, of carrier trapping and. recombination of nonequilibrium carriers in the PbWO4 lattice is briefly discussed.

Harvard-Zitierstil: Laguta, V., Martini, M., Vedda, A., Nikl, M., Mihóková, E., Bohácek, P., et al. (2001) Photoinduced Pb⁺ center in PbWO₄:: Electron spin resonance and thermally stimulated luminescence study -: art. no. 165102, Physical Review B (condensed matter and materials physics), 64(16), Article 165102. https://doi.org/10.1103/PhysRevB.64.165102

APA-Zitierstil: Laguta, V., Martini, M., Vedda, A., Nikl, M., Mihóková, E., Bohácek, P., Rosa, J., Hofstätter, A., Meyer, B., & Usuki, Y. (2001). Photoinduced Pb⁺ center in PbWO₄:: Electron spin resonance and thermally stimulated luminescence study -: art. no. 165102. Physical Review B (condensed matter and materials physics). 64(16), Article 165102. https://doi.org/10.1103/PhysRevB.64.165102