Evaluating NaREMgWO 6 (RE = La, Gd, Y) Doubly Ordered Double Perovskites as Eu 3+ Phosphor Hosts

Three doubly ordered double perovskites NaREMgWO (RE = La, Gd, Y) have been synthesized via traditional solid-state methods, doped with Eu , and characterized to evaluate their promise as Eu phosphor hosts. NaYMgWO , a new member of the family, was found to crystallize in the P2 space group and is isostructural with NaGdMgWO . Emissions characteristic of Eu ions ( D → F ) were observed, with the most intense transition being the D → F transition near 615 nm. Substitution of Eu onto a more compressed RE site in the NaY Eu MgWO and NaGd Eu MgWO hosts results in a blue shift of the charge-transfer excitation band and an increase in the intensity of the D → F transition compared to NaLa Eu MgWO . All of the hosts can incorporate high concentrations of Eu before concentration quenching is observed. When the rare-earth ion is either Gd or Y , good energetic overlap between the Eu charge-transfer band and the absorption of the host lattice results in sensitization and energy transfer from the perovskite host lattice to the Eu activator sites. These hosts display comparable if not better luminescence than Y O :Eu , a commonly used commercial standard, demonstrating their promise as red phosphors.