Excellent photoluminescence and cathodoluminescence properties in Eu3+-activated Sr2LaNbO6 materials for multifunctional applications

Single Eu3+-activated Sr2LaNbO6 (SLN) phosphors with double-perovskite structure were successfully synthesized and their photo/cathodoluminescence properties were investigated in detail. The optimal doping concentration was confirmed to be about 0.3 mol while the concentration quenching was dominated by the dipole–dipole interaction. The optimum SLN:0.3Eu3+ phosphor exhibited good photoluminescence emission intensity, color purity, thermal stability, and quantum yield. With the help of the Judd-Oflet theory, Eu3+ ions would possess the stronger symmetry sites in SLN host lattice. Besides, the packaged red and white lighting-emitting diodes (LEDs) based on optimum sample were fabricated. Particularly, the packaged white LED device displayed good color rendering index value of 86.89 and correlated color temperature value of 4835 K. Moreover, the novel LED structure based on the SLN:0.3Eu3+-polydimethylsiloxane film having stable physicochemical structure was prepared and emitted a strong red light. Eventually, the strong cathodoluminescence intensity with large electron penetration depth was provided. These above results imply that SLN:Eu3+ phosphors with excellent photo/cathodoluminescence properties could be promised for multifunctional applications.