Luminescence properties of tungstates and molybdates phosphors: Illustration on ALn(MO<sub>4</sub>)<sub>2</sub> compounds (A = alikaline cation, Ln = lanthanides, M = W, Mo)
Langue
en
Article de revue
Ce document a été publié dans
Solid State Sciences. 2011, vol. 13, n° 2, p. 460-467
Elsevier
Résumé en anglais
The photoluminescence characteristics of compounds ALn(MO<sub>4</sub>)<sub>2</sub>, with A = Li, Na, K; Ln = Y, La, Gd, Lu, M = Mo, W, are analyzed as a function of their structure. The influences of cation size and ...Lire la suite >
The photoluminescence characteristics of compounds ALn(MO<sub>4</sub>)<sub>2</sub>, with A = Li, Na, K; Ln = Y, La, Gd, Lu, M = Mo, W, are analyzed as a function of their structure. The influences of cation size and electronegativity are discussed in relation with the Struck and Fonger theory, with a view to developing one or more of those compounds as phosphors in relation with the development of white LEDs. It appears that there are various excited states implied in the absorption process, with partially radiative transfer between them. All the radiative mechanisms are strongly related to temperature. Due to their electronegativity, tungstate compounds are the most promising, compared to molybdate ones, especially those in the monoclinic P<sub>2/n</sub> structure.< Réduire
Mots clés en anglais
Tungstate
Molybdate
Photoluminescence
Struck and Fonger
White LED
Origine
Importé de halUnités de recherche