Synthesis, photoluminescence properties and potential applications of Eu3+ and Mn4+ activated SrLaMgNbO6 phosphors

Abstract A series of double-perovskite-structure SrLaMgNbO6:xEu3+ (SLMN:xEu3+) and SrLaMgNbO6:x Mn4+ (SLMN:x Mn4+) phosphors were prepared by solid state reaction method, and their structure, morphology and photoluminescence properties were systematically investigated. Under NUV excitation, the SLMN:xEu3+ exhibits a sharp red emission peak at 614 nm, while the SLMN:x Mn4+ phosphor exhibits a far-red emission band around 695 nm. The optimal concentration of Eu3+ and Mn4+ ions in SLMN are x = 0.5 and x = 0.004 respectively, and the energy transfer mechanisms of Eu3+ and Mn4+ are both determined to be dipole-dipole interactions. The thermal quenching effects of SLMN:xEu3+ and SLMN:x Mn4+ phosphors were investigated based on the crossover model, and the activation energies were calculated to be 0.314 and 0.286 eV, respectively. The crystal field of SLMN:x Mn4+ was analyzed and its luminescence mechanism was illustrated using the Tanabe–Sugano energy level diagram. Ultimately, white and red LEDs were made with the SLMN:Eu3+ and SLMN:Mn4+ phosphors, and their potential applications in WLED or plants growth LED were discussed based on the electroluminescence parameters.