Close-relationship between the luminescence and structural characteristics in efficient nano-phosphor Y 2 Mo 4 O 15 :Eu 3+

Abstract: Nano-sized Y2Mo4O15:Eu3+ was synthesized by the pechini method. The crystalline phase was confirmed by the structural refinements. The photoluminescence (PL) excitation and emission spectra, and decay lifetimes were investigated. The phosphors can be efficiently excited by near-ultraviolet light and exhibit a red luminescence around 616 nm from the forced electric dipole transition 5D0→7F2 of Eu3+ ions. The thermal stability was investigated from the temperature-dependent luminescence lifetimes and intensities. The Eu3+ ions were confirmed to distribute in one kind of crystallographic site with a high “ordered state” in this lattices. The structure provides long distances between Eu3+ ions limiting the luminescence energy transfer or diffusions. Crystal structure of Y2Mo4O15 is beneficial to the luminescence of activators such as Eu3+ ions. The absolute luminescence internal quantum efficiency (QE), CIE color coordinates and thermal activation energy (∆E) were reported.