TM-YB-TM ENERGY TRANSFERS AND EFFECT OF TEMPERATURE ON THE FLUORESCENCE INTENSITIES IN OXYFLUORIDE TELLURITE COMPOUNDS


OZEN G. , DENIS J., GENOTELLE M., PELLE F.

JOURNAL OF PHYSICS-CONDENSED MATTER, cilt.7, ss.4325-4336, 1995 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 7 Konu: 22
  • Basım Tarihi: 1995
  • Doi Numarası: 10.1088/0953-8984/7/22/014
  • Dergi Adı: JOURNAL OF PHYSICS-CONDENSED MATTER
  • Sayfa Sayıları: ss.4325-4336

Özet

Up-conversion processes in PbF2+TeO2+WO3 glass-ceramics doped with Tm3+ and codoped with Tm3+ and Yb3+ ions were investigated under 680 nm excitation. Emission, excitation and time-resolved spectra and decay profiles were measured at temperatures between 12 and 300 K. A strong blue emission centred at 478 nm originating from the (1)G(4) level of Tm3+ was observed in a doubly doped sample via a two-step energy transfer mechanism, (Tm) F-3(4) --> (Yb) (2)E(5/2) energy transfer and a positive feedback (Yb) F-2(5/2) --> (Tm) (1)G(4) process, raising the excited Tm3+ ion from the F-3(4) to the (1)G(4) level following the absorption of 680 nm excitation light. The time-resolved emission spectra prove the validity of these energy transfer processes.