On the phosphorescence mechanism in SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup> and its codoped derivatives
Langue
en
Article de revue
Ce document a été publié dans
Solid State Sciences. 2007, vol. 9, n° 7, p. 608-612
Elsevier
Résumé en anglais
The mechanism of phosphorescence in SrAl<sub>2</sub>O<sub>4</sub>:Eu,Dy material is discussed on the basis of a thermo-activated release of electrons trapped at oxygen vacancy sites. The depths and concentration of the ...Lire la suite >
The mechanism of phosphorescence in SrAl<sub>2</sub>O<sub>4</sub>:Eu,Dy material is discussed on the basis of a thermo-activated release of electrons trapped at oxygen vacancy sites. The depths and concentration of the electron traps are strongly affected by codoping with trivalent lanthanide cations Ln<sup>3+</sup>. This finding is rationalized by comparing the ionization potentials of the dopant cation Eu<sup>2+</sup>, the codopant cation Ln<sup>3+</sup> and the substituted cation Sr<sup>2+</sup>. Such a use of ionization potentials provides a practical guide with which the variation of the phosphorescent decay time in the codoped derivatives of SrAl<sub>2</sub>O<sub>4</sub>:Eu is predicted.< Réduire
Mots clés en anglais
Phosphorescence
Mechanism
SrAl2O4
Electron trap
Dopant
Trap depth
Origine
Importé de halUnités de recherche