JUBERA, Veronique; CHAMINADE, Jean-Pierre; GARCIA, Alain; GUILLEN, François; FOUASSIER, Claude

doi:10.1016/S0022-2313(02)00335-6

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JUBERA, Veronique
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CHAMINADE, Jean-Pierre
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GARCIA, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Ce document a été publié dans

Journal of Luminescence. 2003, vol. 101, n° 1-2, p. 1-10

Elsevier

Résumé en anglais

The luminescence characteristics of Eu3+ in the borates Li6Y(BO3)3 and Li3La2(BO3)3 and the recently discovered oxyborates LiLa2O2BO3, LiLn6O5(BO3)3 (Ln=Y,Gd) and Li2Lu5O4(BO3)3 have been investigated and compared to those in the borates LnBO3 (Ln=La,Y) and the oxyborates “Ln3BO6” (Ln=La,Gd). The probability of electric dipole f–f transitions is generally markedly higher in oxyborates than in borates. This is ascribed to the highly anisotropic environment of rare earth ions and the low position of the charge transfer states. Consequently, the Eu3+-activated oxyborates are characterized by a deeper red emission and faster decay. The luminescence characteristics of Eu3+ in the borates Li6Y(BO3)3 and Li3La2(BO3)3 and the recently discovered oxyborates LiLa2O2BO3, LiLn6O5(BO3)3 (Ln=Y,Gd) and Li2Lu5O4(BO3)3 have been investigated and compared to those in the borates LnBO3 (Ln=La,Y) and the oxyborates “Ln3BO6” (Ln=La,Gd). The probability of electric dipole f–f transitions is generally markedly higher in oxyborates than in borates. This is ascribed to the highly anisotropic environment of rare earth ions and the low position of the charge transfer states. Consequently, the Eu3+-activated oxyborates are characterized by a deeper red emission and faster decay.< Réduire

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Phosphors

Borates

Oxyborates

Europium

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Luminescent properties of Eu3+-activated lithium rare earth borates and oxyborates

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