Luminescence properties of (La,Pr)2Ti2O7

The luminescence properties of the pyrotitanates (La,Pr)2Ti2O7 are examined as a function of the Pr3+ concentration in the range 0.2–15mol% Pr. Under UV excitation at 337nm, the compounds exhibit intense luminescence signals due to praseodymium arising mainly in the blue and in the red region of the...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 275-277; pp. 307 - 310
Main Authors Diallo, P.T, Boutinaud, P, Mahiou, R, Cousseins, J.C
Format Journal Article
LanguageEnglish
Published Elsevier B.V 24.07.1998
Subjects
Crystal field effects
Lanthanum pyrotitanate
Photoluminescence
Praseodymium
Crystal field effects
Lanthanum pyrotitanate
Photoluminescence
Praseodymium
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Summary:The luminescence properties of the pyrotitanates (La,Pr)2Ti2O7 are examined as a function of the Pr3+ concentration in the range 0.2–15mol% Pr. Under UV excitation at 337nm, the compounds exhibit intense luminescence signals due to praseodymium arising mainly in the blue and in the red region of the spectrum. The red emission is due essentially to Pr 1D2→3H4 transitions and appears to be the more intense in the lowest Pr-concentrated compounds. In contrast, the blue luminescence (Pr 3P0→3H4 transitions) is predominant in the highest Pr-activated titanates. This behaviour is explained by considering two distinct categories of sites inside which the Pr3+ ions undergo crystal field effects of different strengths.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(98)00324-7