Published August 2005 | Version v1
Journal article Metadata-only

Photodynamic processes in CaF2 crystals activated by Ce3+ and Yb3+ ions

Creators

  • 1. Kazanskij Gosudarstvennyj Univ., Kazan' (Russian Federation)

Description

The photochemical properties of CaF2 crystals activated by Ce3+ and Yb3+ ions are studied. A model of the photodynamic processes induced by pumping UV or vacuum UV radiation in active media is suggested and experimentally verified. This model explains both the presence of color centers of electronic and hole nature in crystals activated by cerium and the mechanism of suppressing the solarization processes after additional activation of the samples by Yb3+ ions. The cross sections of the processes of free-carrier capture by various ytterbium impurity centers are estimated. These impurity centers are established to be effective centers of recombination of free charge carriers of both signs

Abstract (Russian)

Исследованы фотохимические свойства кристалла CaF2, активированного ионами Ce3+ и Yb3+. Предложена и экспериментально обоснована модель фотодинамических процессов, индуцированных ультрафиолетовым или вакуумно-ультрафиолетовым излучением накачки в активных средах, позволяющая объяснить как появление в активированных церием кристаллах центров окраски электронной и дырочной природы, так и механизм подавления процессов соляризации при соактивации образцов ионами Yb3+. Оценены сечения процессов захвата свободных носителей заряда примесными центрами различных типов, образованными ионами иттербия. Установлено, что эти примесные центры являются эффективными центрами рекомбинации свободных носителей заряда обоих знаков

Additional details

Additional titles

Original title (Russian)
Фотодинамические процессы в кристаллах CaF

Publishing Information

Journal Title
Fizika Tverdogo Tela
Journal Volume
47
Journal Issue
8
Journal Page Range
p. 1403-1405
ISSN
0367-3294
CODEN
FTVTAC

Conference

Title
12. Feofilov symposium. Spectroscopy of crystals activated by rare-earth and transition metal ions
Original Conference Title
XII Feofilovskij simpozium. Spektroskopiya kristallov, aktivirovannykh redkozemel'nymi ionami i ionami perekhodnykh metallov
Dates
22-25 Sep 2004
Place
Ekaterinburg (Russian Federation)

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
37104251
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
ABSORPTION SPECTRA; CALCIUM FLUORIDES; CERIUM ADDITIONS; ELECTRON CAPTURE; ELECTRONIC STRUCTURE; ELECTRONS; EMISSION SPECTRA; EXPERIMENTAL DATA; F CENTERS; FAR ULTRAVIOLET RADIATION; HOLES; OPTICAL PUMPING; PHOTOIONIZATION; PHOTOLUMINESCENCE; RECOMBINATION; YTTERBIUM ADDITIONS
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; ALLOYS; CALCIUM COMPOUNDS; CALCIUM HALIDES; CAPTURE; CERIUM ALLOYS; COLOR CENTERS; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; DATA; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; EMISSION; FERMIONS; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; INFORMATION; IONIZATION; LEPTONS; LUMINESCENCE; NUMERICAL DATA; PHOTON EMISSION; POINT DEFECTS; PUMPING; RADIATIONS; RARE EARTH ADDITIONS; RARE EARTH ALLOYS; SPECTRA; ULTRAVIOLET RADIATION; VACANCIES

Optional Information

Notes
7 refs., 3 figs., 1 tab.