0000000000409910
AUTHOR
Agnese Spustaka
showing 8 related works from this author
Cinka oksīda luminiscentās īpašības
2021
Cinka oksīds ir plaši pētīts pusvadītājs ar lielu aizliegtās zonas platumu un lielu brīvo eksitonu saites enerģiju, tādejādi cinka oksīda eksitonu luminiscenci var novērot ne tikai pie zemas temperatūras, bet arī istabas temperatūrā. Savukārt ātrā eksitonu luminiscences dzišana nodrošina cinka oksīda potenciālu pielietojumu ātrdarbīgiem scintilatoriem. Darbā veikti trīs veidu cinka oksīdu pētījumi – monokristālisku, pulverveida un keramisku. Tika reģistrētas un salīdzinātas cinka oksīda luminiscentās īpašības, daļai paraugu pārbaudīta luminiscences spektru atkarība no temperatūras, luminiscences dzišana un paraugu homogenitāte. Apkopojot eksperimentālos rezultātus, novērtēts, kuri no pētīta…
The boron effect on low temperature luminescence of SrAl2O4:Eu, Dy
2020
V.V. acknowledges the financial support of ERDF PostDoc project No. 1.1.1.2/VIAA/3/19/440 (University of Latvia Institute of Solid State Physics, Latvia) and K.S., I.B., A.Z., D.M. and K.L. acknowledge the financial support of ERDF, European-Union Project No. 1.1.1.1/16/A/182 (University of Latvia Institute of Solid State Physics, Latvia).
ZnO and ZnO:Ga Ceramics for Advanced Scintillators
2020
The undoped ZnO reveals narrow luminescence bands located close to fundamental absorption edge, known as near band luminescence (NBL) and defects related wide luminescence band within visible range of spectrum. NBL decay is in sub-nanosecond range and it is promising for fast scintillator development. However, the defects luminescence decay is in microsecond range and it is disturbing for fast scintillators. Dopants strongly change the luminescence properties, mainly the intensity and decay time and that is the cause for intense study of doped ZnO luminescence properties. Thus the study of luminescent properties of undoped ZnO and doped ZnO:Ga ceramics was carried out. The dependence of the…
Low temperature afterglow from SrAl 2 O 4 : Eu, Dy, B containing glass
2020
V.V. acknowledges the financial support of ERDF PostDoc project No. 1.1.1.2/VIAA/3/19/440 (University of Latvia Institute of Solid State Physics, Latvia) and LP the Academy of Finland (Flagship Programme, Photonics Research and Innovation PREIN 320165 and Academy Project -326418) for the financial support. Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01- 2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART 2 .
Low Temperature Afterglow from SrAl <sub>2</sub>O <sub>4</sub>: EU, Dy, B Containing Glass
2020
SrAl2O4: Eu, Dy, B particles were added in a phosphate glass (90NaPO3-10NaF (in mol%)) using the direct doping method. For the first time, the composition of the particles prior to and after embedding them in the glass was analysed using EPMA analysis. Boron was found to be incorporated in already distorted surroundings creating new trapping centers in the particles which are thought to be favourable for the tunnelling process and so for the afterglow at 10K. Despite the partial decomposition of the particles, the glass exhibit afterglow at low temperature confirming to be promising materials for low temperature applications.
Recent progress in understanding the persistent luminescence in SrAl 2 O 4 :Eu,Dy
2019
Ever since the discovery of SrAl2O4:Eu,Dy persistent afterglow material, that can intensively glow up to 20 h, the mechanism of long-lasting luminescence has been a popular area of research. The re...
Gallium Concentration Optimisation of Gallium Doped Zinc Oxide for Improvement of Optical Properties
2021
The research has been supported by project ERA.NET RUS_ST2017-05 (Latvia) and No. 18-52-76002 (Russia). The Institute of Solid State Physics, University of Latvia as the Centre of Excellence has received funding from the European Union’s Hori-zon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-Teaming-Phase2 under grant agreement No. 739508, project CAMART².
Recent progress in understanding the persistent luminescence in SrAl2O4:Eu,Dy
2019
This work was conducted with the funding of Scientific Research Project for Students and Young Researchers realised at the Institute of Solid State Physics, University of Latvia [SJZ/2018/2].