Synthesis, structure, and luminescence properties of SrSiAl2O3N2:Eu2+ phosphors for light-emitting devices and field emission displays

Abstract

A series of SrSiAl₂O₃N₂:Eu²⁺ (0.005 ≤ x ≤ 0.05) phosphors were successfully synthesized through a pressureless, facile, and efficient solid state route. The crystal structure, band structure, and their photoluminescence and cathodoluminescence properties were investigated in detail. The phosphors exhibit rod shape morphology with a uniform Eu²⁺ distribution. Under n-UV excitation the emission spectra shift from 477 to 497 nm with an increase of Eu²⁺ concentration. The concentration quenching mechanism of Eu²⁺ emission was dominated by the dipole–dipole interaction. The thermal stability is comparable to that of the commercial Ba₂SiO₄:Eu²⁺ phosphor. The phosphor also exhibits high current saturation and high resistance under low voltage electron bombardment. All the results indicate that the SrSiAl₂O₃N₂:Eu²⁺ phosphors can be considered as candidates for application in both white LEDs and FEDs.