Electron paramagnetic resonance and luminescence study of sol-gel derived YAG:Cr powder

Jun Ren Lo*, S. Ezhilvalavan, Tseung-Yuen Tseng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Electron paramagnetic resonance (EPR) and luminescence studies were carried out for the sol-gel-derived YAG:Cr powders subjected to three kinds of heat treatment processes. The results show that powders processed using the two-step heat treatment process with the addition of 20 wt% LiCl and by direct heat treatment at 1500°C exhibit good luminescence properties. The emission spectrum for the powders obtained by the two-step process shows the R-line at 688 nm, whereas the powders directly heat treated at 1500°C display an additional R-line of A12O3 : Cr at 694 nm. EPR measurements show that the presence or absence of absorption peaks depends on the Cr3+ environment in the host lattice resulting from the different methods of heat treatment of the powder. The EPR spectra of YAG:Cr3+ phosphors were interpreted to indicate both Cr3+ single ion and Cr3+-Cr3+ pair (with spin three) transitions.

Original languageEnglish
Pages (from-to)1390-1393
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number3 A
StatePublished - 1 Dec 1999


  • EPR
  • Luminescence
  • Sol-gel
  • YAG:Cr phosphors

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