Luminescence properties of La1-χTmχTa7O19

Shun ichi Kubota, Tadashi Endo, Hirotsugu Takizawa, Masahiko Shimada

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8 Citations (Scopus)


The luminescence properties of Tm3+ in La1-χTmχTa7O19 solid solutions were examined systematically. The substitution of Tm3+ for La3+ was carried out by a decomposition reaction of nitrates involving the corresponding constituents at 1200 °C in air. X-Ray diffraction patterns of the solid solutions indicated that the crystal structure consisted of a network of (La1-χ 3+Tmχ staggered |3+, Ta5+)-O2- polyhedra interstratified with a double layer of Ta5+-O2- polyhedra. According to the excitation and emission spectra, the most intense emission was found near 460 nm and quenched above χ=0.14 in La1-χTmχTa7O19. Also, lifetime results verified that the emission could be assigned not to the transition 1G4 å 3H6, but to the transition 1D2 å3H4. Upon cathode ray excitation some emissions of Tm3+ were superimposed by a broad emission due to the clusters of Ta5+-O2- polyhedra. As a result, a low dimensional arrangement of Tm3+ was much more preferable for getting intense emission because it reduced the energy migration between Tm3+ ions.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 1994 Aug

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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