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Information × Registration Number 0223U003083, 0122U001833 , R & D reports Title Optically stimulated luminescence in new dosimetric materials based on doped borate glass and glassnanoceramic popup.stage_title Head Padliak Bohdan V., д.ф.-м.н. Registration Date 29-03-2023 Organization OG Vlokh Institute of Physical Optics of the Ministry of Education and Science of Ukraine popup.description2  Based on experimental results and the Judd–Ofelt theory the oscillator strengths, phenomenological parameters, radiative properties and quantum efficiency of luminescence of Pr3+ ions in Li2B4O7:Pr and Li2B4O7:Pr,Ag glass samples were determined. The most intense luminescence band of Pr3+ ions has a peak at 601 nm. The observed enhancement of the luminescence intensity, an increase in the stimulated radiation cross-section and the luminescence quantum efficiency in Li2B4O7:Pr,Ag glass is explained by the transfer of excitation energy from Ag to Pr3+ ions and the local field effect caused by silver nanoparticles. X-ray diffraction studies confirmed the glass structure of the obtained Li2B4O7:Eu,Cu and Li2B4O7:Sm,Cu samples, and average interatomic distances and coordination numbers were estimated from the calculated radial distribution function. The analysis of EPR and optical spectroscopy data showed that the Cu impurity enters the network of Li2B4O7:Cu,Eu glass in the form of Cu2+ and Cu+ ions. The photoluminescence spectra of Li2B4O7:Cu,Eu glass reveal a very broad emission band in the blue spectral range, which goes to the transition of Cu+ ions and several narrow emission bands in the orange-red spectral range, which corresponds Eu3+ transitions. The photoluminescence spectra of Li2B4O7:Sm,Cu glass show a broad emission band in the blue spectral range corresponding to the 3d94s1 → 3d10 transition of Cu+ ions and four narrow emission bands in the yellow-red spectral range corresponding to 4G5/2 → 6HJ (J = 5/ 2, 7/2, 9/2, 11/2) transitions of Sm3+ ions. A comparison of the results obtained for Li2B4O7:Sm,Cu, Li2B4O7:Sm and Li2B4O7:Cu glass samples showed a slight decrease in the intensity and a reduction in the decay time of the luminescence of Sm3+ ions and an increase in the decay time of the luminescence of Cu+ ions in Li2B4O7:Sm,Cu glass, which is explained by the transfer of excitation energy from Sm3+ ions to Cu+ and Cu2+ ions. Product Description popup.authors Adamiv Volodymyr T. Padlyak Bohdan V. Say Andriy Stepanovych Teslyuk Igor Mykhaylovych popup.nrat_date 2023-03-29 Close