High pressure luminescence spectra of CaMoO4:Pr3+

J Phys Condens Matter. 2012 May 30;24(21):215402. doi: 10.1088/0953-8984/24/21/215402. Epub 2012 Apr 27.

Abstract

Steady state and time resolved luminescence measurements of CaMoO(4) doped with Pr(3+) as a function of hydrostatic pressure in the 1-175 kbar range are presented. It has been observed that with increasing pressure the spectral features shift towards lower energies, the decay times of both (3)P(0) and (1)D(2) emitting levels become shorter and the intensity of the (3)P(0) emission decreases to complete quenching at about 110 kbar, whereas that of the (1)D(2) emission increases in the 0-100 kbar range and then rapidly decreases when the pressure exceeds 127 kbar. A variation of the structure of the spectral manifolds indicates that a pressure induced phase transition of the host lattice occurs in the 80-100 kbar range. The quenching of the luminescence and the shortening of the decay times have been accounted for by means of a model that takes into account the role played by a praseodymium trapped exciton in the excited state dynamics of the investigated material.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Calcium Compounds / chemistry*
  • Computer Simulation
  • Luminescent Measurements*
  • Materials Testing
  • Models, Chemical*
  • Molybdenum / chemistry*
  • Oxides / chemistry*
  • Pressure

Substances

  • Calcium Compounds
  • Oxides
  • molybdenum trioxide
  • Molybdenum
  • lime