The Synthesis And Enhanced Luminescence Property Of Sr₃Si₆O₃N₈:Eu²⁺ Phosphor

Due to its low preparation temperature, high brightness, stable physical andchemical properties, well controlled paritcle size, the phosphate, a convential host ofphosphor, has been recongniced as an improtant light-emitting material. In the paper,nitrogen oxides phosphors with good luminescent properties were prepared byconventional solid-state reaction method, and the factors of calcination temperatures,flux, concentrations of rare ions to its luminescent properties were studied. The mainresults are listed as followers:A series sample of Sr3Si6O3N8:Eu2+phosphors were prepared by conventionalsolid-state reaction method. The influences of calcination temperatures and flux to thephase structure, luminescent properties and particle morphology were studiedsystematically. The results indicated that the suitable flux and calcinationtemperatures were NaF and1400℃, respectively. Excitation spectrum of the sampleis about380~450nm, therefore, this phosphor can be applicatted in white LEDsexcited by ultraviolet chip, its emission peak at about534nm.The effctes of Eu2+ions concentrations to the luminescent properties ofSr3Si6O3N8:Eu2+phosphors were studied. The rusults indicated that with theincreasing of Eu2+concentrations, phenomenons of concentration quenching andredshift can be investigated. And it is analysised that the concentration quenchingmechanism of Eu2+ions in Sr3Si6O3N8:Eu2+is dipole to dipole mechanism.A series sample of Sr3-x-ySi6O3N8:(Ce3+, Eu2+) were prepared by conventionalsolid-state reaction method. It can be investigated that there were two peaks at410nmand534nm in the emission spectrum. The peak at410nm was caused by Ce3+ionswith blue light-emitting, while the peak at534nm was caused by Eu2+ions with greenlight-emitting. The energy transfer phenomenons of Ce3+â†'Eu2+in the samples werealso discussed.A series sample of Sr2.9-ySi6O3N8:(Mn2+, Eu2+) were prepared by conventionalsolid-state reaction method. It can be seen that the luminescent intensity of Eu2+improved at about145%, but there was nothing changing of the life time of Eu2+ ions Euwhen the concentration of Eu2+ions was0.1mol. The results indicated that theenergy transfer in the Sr2.9-ySi6O3N8:(Mn2+, Eu2+) phosphors was Mn2+to Eu2+, butnot Eu2+to Mn2+, and the energy transfer mechanism was multidipole.