The role of Ti in charge carriers trapping in the red-emitting Lu2O3:Pr,Ti phosphor

Paulina Bolek, Dagmara Kulesza, A. J.J. Bos, E Zych

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

Lu2O3:Pr,Ti storage phosphors were prepared by means of high temperature (1700 °C) sintering both in a reducing atmosphere of the N2-H2 mixture (3:1 by volume) and in ambient air. Their thermoluminescent (TL) properties were presented and discussed. Pr singly-doped material showed only very inefficient TL. Ti co-doping boosted the TL efficacy, and the most potent TL was observed for ceramics containing 0.05 mol% of Pr and 0.007 mol% of Ti and made in the reducing atmosphere. Samples prepared in air produced noticeably less intense TL. The glow curves of both materials consisted of one broad asymmetric band with the maximum around 357 °C for the heating rate of 4.7 °C/s. The glow peaks could be fitted with three (reduced samples) or two (air-sintered) components. The latter lacked the high-temperature part of TL compared to the former. Tmax-Tstop experiments indicated that the TL is connected with continuous distribution of trap depths, which were estimated to cover the range of ~ 1.7 to 2.3 eV, and their specific values were slightly dependent on the methodology. Anomalous dependence of the TL intensity on the heating rate made the semi-localized transition the likely mechanism affecting the TL properties of Lu2O3:Pr,Ti ceramics. The collected data allowed to construct vacuum referred binding energy (VRBE) level scheme with Pr3+ and Ti3+/4+ energy levels in the band gap of Lu2O3 host that could explain the TL mechanism in Lu2O3:Pr,Ti ceramics.

Original languageEnglish
Pages (from-to)641-648
Number of pages8
JournalJournal of Luminescence
Volume194
DOIs
Publication statusPublished - 2018

Keywords

  • Carriers trapping
  • Energy storage
  • LuO:Pr,Ti
  • Storage phosphors
  • VRBE

Fingerprint Dive into the research topics of 'The role of Ti in charge carriers trapping in the red-emitting Lu<sub>2</sub>O<sub>3:</sub>Pr,Ti phosphor'. Together they form a unique fingerprint.

Cite this