Details

Autor(en) / Beteiligte

• Baklanova, Ya V.
• Ishchenko, А.V.
• Denisova, Т.А.
• Maksimova, L.G.
• Shulgin, B.V.
• Pustovarov, V.А.
• Viktorov, L.V.

Titel

Photo- and radioluminescence of lithium hafnate Li2HfO3

Ist Teil von

• Optical materials, 2012-05, Vol.34 (7), p.1037-1041

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2012

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• ► The citrate technique for fine-dispersed Li2HfO3 scintillator. ► Radioluminescence and photoluminescence in VIS, UV and VUV ranges have been recorded. ► The luminescence centers are self-trapped and defect bond excitons. ► The particle size influences on the luminescence properties. Photoluminescence, excitation and pulse cathode luminescence spectra, and decay kinetics of lithium hafnate Li2HfO3 were investigated at temperatures 300 and 7.5K. Time-resolved luminescence spectra were excited with synchrotron radiation in UV–VUV range. Strong emission with the peak position at 4.42eV and with the decay time in μs range was revealed at T=7.5K. The emission was attributed to radiative decay of self-trapped excitons (STE). The features observed in the excitation spectra at 6.6eV were likely to take place because of the exciton formation, with inter-band transitions dominating at 6.7eV. Crystal structure defects underpin the luminescence spectra formation at room temperature in the frame of vacancy model.