Color-tunable blue to green Ca 4-1.5x Ta 2 O 9: XTb 3+ phosphor: Cross-relaxation mechanism and thermal stability

Ying Chien Fang, Xiao Rong Huang, Yung Der Juang, Sheng-Yuan Chu

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20 Citations (Scopus)


Color-tunable Ca 4-1.5xTa 2O 9: xTb 3+ phosphors are prepared via a convenient solid-state reaction and the cross-relaxation mechanism is investigated. The concentration of Tb 3+ ions greatly affects blue-green emission in Ca 4Ta 2O 9 samples. The cross-relaxation effect is explained with the use of Raman and emission spectra and the thermal stability of Ca 4-1.5xTa 2O 9: xTb 3+ is evaluated under excitation at 254 nm. Using the theoretical fitting results, the cross-relaxation between Tb 3+ ions, via energy transfer from 5D 3 to 5D 4, was determined to be a multipolar interaction of the dipole-dipole mechanism. The critical distance was calculated to be 15.45 Å. The thermal quenching temperature (T 50) is higher than 200°C. Results show that Ca 4-1.5xTa 2O 9: xTb 3+ phosphors have good thermal stability and color tunability.

Original languageEnglish
Pages (from-to)1613-1618
Number of pages6
JournalJournal of the American Ceramic Society
Issue number5
Publication statusPublished - 2012 May 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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