Time-Resolved Vacuum Ultraviolet Spectroscopy of Er3+ ions in the SrF2 Crystal

The photoluminescence and photoexcitation spectra as well as the luminescence decay kinetics of Er3+ ions in the visible ultraviolet and vacuum ultraviolet (VUV) regions have been studied by the method of low-temperature, time-resolved VUV-spectroscopy on excitation by synchrotron radiation. In the VUV spectral region of the luminescence of SrF2:1% Er3+, the 146.5-nm band with a time of decay of less than 0.6 nsec was revealed together with the well-known emission band at 164.3 nm (decay constant in the microsecond range). Its possible nature is discussed. The specific features of the formation of photoexcitation spectra of the f-f and f-d transitions in the Er3+ ion are considered. Competition between the processes of excitation of f-f and d-f luminescence has been revealed. It manifests itself in the inverse relationship of their photoexcitation spectra in a range of energies of incident photons that are close to the position of the 4fn-15d configuration levels. © 2005 Springer Science+Business Media, Inc.This work was carried out with the support of grants from the Russian Fundamental Research Foundation (05-02-16530), "Universities of Russia (UR 02.01.433), Ural Scientific Center Promising Materials" CRDF (EK-005-XI), and partially from BMBF (05KS8GMD/1)

Vacuum Ultraviolet Excitation of Rare-Earth ion Luminescence in Strontium Fluoride Crystals

The photoexcitation spectra (70-280 nm) of the Eu 3+, Tb 3+, Dy 3+, Er 3+, and Tm 3+ ion luminescence in strontium fluoride crystals are studied at 8 and 295 K by vacuum ultraviolet spectroscopy using synchrotron-radiation excitation. The processes of transfer of the excitation energy to the impurity centers as well as the relaxation mechanisms of the excited high-energy states of the rare-earth ions are analyzed. The bands corresponding to the interconfiguration 4f-5d transitions and the charge-transfer bands are identified in the photoexcitation luminescence spectra. ©2005 Springer Science+Business Media, Inc.The present work was supported in part by the Russian Foundation for Basic Research (Grant 05-02-16530), by the Program “Russian Universities” (Grant UR.02.01.433), by REC-005 (ЕК-005-XI), and BMBF (05KS8GMD/1)

ЦИТОРЕДУКТИВНОЕ ХИРУРГИЧЕСКОЕ ЛЕЧЕНИЕ С ИНТРАОПЕРАЦИОННОЙ ФОТОДИНАМИЧЕСКОЙ ТЕРАПИЕЙ БОЛЬНОЙ С МУЦИНОЗНЫМ КАНЦЕРОМАТОЗОМ БРЮШИНЫ

Clinical observation of a patient with an orphan disease (mucinous peritoneal carcinomatosis) after 2 courses of intraoperative photodynamic therapy with photogem photosensitizer is presented. During the first course of photodynamic therapy, photogem was administered at a dose of 2.5 mg/kg, the energy density of the laser radiation was 10 J/cm2. The duration of stabilization after the first course of treatment was 2 years, after which the progression of the disease was registered. The second course of photodynamic therapy was carried out in the same way. The duration of stabilization after the first course of treatment was 2.5 years. The patient died as a result of an accident unrelated to the disease.Приведено клиническое наблюдение за пациенткой с орфанным заболеванием – муцинозным канцероматозом брюшины – после проведения 2 курсов интраоперационной фотодинамической терапии с фотосенсибилизатором фотогем. При проведении первого курса фотодинамической терапии фотогем вводили в дозе 2,5 мг/кг, плотность энергии лазерного излучения составила 10 Дж/см2. Продолжительность стабилизации после первого курса лечения – 2 года, после чего зарегистрировано прогрессирование заболевания. Второй курс фотодинамической терапии проводили в том же режиме. Продолжительность стабилизации после второго курса лечения – 2,5 года. Пациентка погибла в результате несчастного случая, не связанного с заболеванием

Structure and luminescent properties of Cs2Sr(VO3)(4): Mn2+

We have developed a procedure for thermally stimulated synthesis of a cesium strontium metavanadate, Cs 2Sr(VO 3) 4:Mn 2+ (0.01, 0.50, 1.00, 5.00 at % Mn 2+), using MnO-containing starting mixtures. The EPR spectrum of the material containing 0.01 at % Mn 2+ shows a hyperfine structure due to the incorporation of a small amount of manganese into the diamagnetic double metavanadate host. The luminescent and optical properties of Cs 2Sr(VO 3) 4:Mn 2+ depend on manganese content. In contrast to higher doping levels, doping with 0.01 at % Mn 2+ increases the integrated emission intensity of the vanadate by 10% and improves its chromaticity characteristics (approaching them to those of white light). We assume that this is due to the reduction in the density of vacancy-type growth defects, such as oxygen vacancies. © Pleiades Publishing, Ltd., 2012

CYTOREDUCTIVE SURGICAL TREATMENT WITH INTRAOPERATIVE PHOTODYNAMIC THERAPY IN PATIENTS WITH MUCINOUS PERITONEAL CARCINOMATOSIS

Clinical observation of a patient with an orphan disease (mucinous peritoneal carcinomatosis) after 2 courses of intraoperative photodynamic therapy with photogem photosensitizer is presented. During the first course of photodynamic therapy, photogem was administered at a dose of 2.5 mg/kg, the energy density of the laser radiation was 10 J/cm2. The duration of stabilization after the first course of treatment was 2 years, after which the progression of the disease was registered. The second course of photodynamic therapy was carried out in the same way. The duration of stabilization after the first course of treatment was 2.5 years. The patient died as a result of an accident unrelated to the disease