Cooperative radiative and nonradiative effects in K2NaScF6 codoped with V3+ and Er3+

J Chem Phys. 2004 Feb 15;120(7):3374-80. doi: 10.1063/1.1640335.

Abstract

K2NaScF6 crystals codoped with V3+ and Er3+ exhibit some novel cooperative near-IR to visible upconversion processes at cryogenic temperatures. V3+ mainly acts as a broadband sensitizer. The V3+ 3T1g --> 3T2g excitation between 13,500 and 15,500 cm(-1), after fast relaxation to V3+ 1T2g, can be transferred to Er3+ 4I(11/2), and then upconversion takes place. Four upconversion mechanisms are identified and characterized. For narrow-band laser excitation the overall efficiency of the upconversion processes is low. However, at 12 K for broadband excitation, such as in a lamp, between 12,000 and 14,500 cm(-1) the number of emitted visible photons is roughly doubled by codoping V3+ in addition to Er3+.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Erbium / chemistry*
  • Erbium / radiation effects
  • Linear Energy Transfer
  • Minerals / chemistry*
  • Minerals / radiation effects
  • Radiation Dosage
  • Vanadium / chemistry*
  • Vanadium / radiation effects

Substances

  • Minerals
  • Vanadium
  • Erbium