Luminescent properties of Eu3+-doped yttrium or gadolinium phosphates.

D. C. Tuan (1) , Roger Olazcuaga (2) , François Guillen (2) , Alain Garcia (2) , B. Moine (3) , Claude Fouassier (2)

1 Center of Analytical Services and Experimentation, Department of Industry
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 LPCML - Laboratoire de Physico-Chimie des Matériaux Luminescents

After an investigation of the formation conditions of the intermediate phases existing in the systems Y2O3-P2O5 and Gd2O3-P2O5 (R/P = 4/1, 3/1, 1, 1/2, 1/3 and 1/5 (R = Y or Gd)) the luminescence characteristics of the Eu3+ ion substituted for the Y3+ or Gd3+ ions have been determined. The position of the O-2 -> Eu3+ charge transfer band shifts to higher energies with increasing P content, which results in high quantum efficiencies for several P-rich phosphates. With increasing P content the probability of the electric dipole transitions is reduced, in particular for the hypersensitive 5D a->7 F2 transition. This causes a shift of the colour point to the orange and lengthens the luminescence lifetime. The luminescence characteristics are compared with those of the red phosphors for display.

Mots clés: Luminescence; Optical properties; Europium; Phosphates; Gadolinium; Yttrium

Domaines: Matériaux

D. C. Tuan, Roger Olazcuaga, François Guillen, Alain Garcia, B. Moine, et al.. Luminescent properties of Eu3+-doped yttrium or gadolinium phosphates.. Journal de Physique IV Proceedings, 2005, vol. 123, p. 259-263. ⟨10.1051/jp4:2005123047⟩. ⟨hal-00022696⟩