Luminescence properties of a blue-emitting phosphor: (Sr1−xEux)Si9Al19ON31 (0<x≤1)

Abstract

Blue-emitting Sr 1− x Eu x Si 9 Al 19 ON 31 phosphors were synthesized at 1800 °C for 2 h under 1 MPa N 2 by using the gas-pressure sintering method (GPS). The microstructure, photoluminescence (PL) properties of the prepared phosphors were investigated. Under the 290 nm excitation, broad PL emission bands with peak positions at 448–490 nm were detected. The concentration quenching was not observed owing to the large distance betweenEu 2+ ions that made the nonradiative energy transfer between neighboring Eu 2+ ions difficult. The blue phosphor generally showed a small thermal quenching at low Eu 2+ concentrations. The absorption and external quantum efficiency of the synthesized Sr 0.5 Eu 0.5 Si 9 Al 19 ON 31 were 85% and 62% upon the 365 nm excitation, respectively. The interesting PL results indicate that Sr 1− x Eu x Si 9 Al 19 ON 31 has great potentials as a blue phosphor for white LEDs applications. Sr 0.7 Eu 0.3 Si 9 Al 19 ON 31 gives blue-emitting at 471 nm. Excitation spectrum is composed of five bands in the range of 250–450 nm, which are matching well with emission wavelength of UV LEDs. • Blue-emitting Sr 1− x Eu x Si 9 Al 19 ON 31 phosphors were synthesized by gas-pressure sintering method. • The concentration quenching was not observed in this phosphor. • This blue phosphor generally showed a small thermal quenching at low Eu 2+ concentrations. • The absorption and external quantum efficiency of the synthesized Sr 0.5 Eu 0.5 Si 9 Al 19 ON 31 were 85% and 62% upon the 365 nm excitation.