Eu³⁺-activated La₂MoO₆-La₂WO₆ red-emitting phosphors with ultrabroad excitation band for white light-emitting diodes.

ABSTRACT: A series of novel Eu³⁺-activated La₂MoO₆-La₂WO₆ red-emitting phosphors have been successfully prepared by a citrate-assisted sol-gel process. Both photoluminescence excitation and emission spectra suggest that the resultant products have the strong ultrabroad absorption band ranging from 220 to 450 nm. Under the excitation of 379 nm, the characteristic emissions of Eu³⁺ ions corresponding to the ⁵D₀ → ⁷F _J transitions are observed in the doped samples. The optimal doping concentration for Eu³⁺ ions is found to be 12 mol% and the quenching mechanism is attributed to the dipole-dipole interaction. A theoretical calculation based on the Judd-Ofelt theory is carried out to e

SUBMITTER: Du P 

PROVIDER: S-EPMC5607311 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature