Formation of Sr₂Si₅N₈:Eu²⁺ and Its Transformation to SrSi₆N₈:Eu²⁺ Controlled by Temperature and Gas Pressure

Abstract

Firing temperature and gas pressure effect of synthesizing Sr2Si5N8:Eu2+ were investigated. The emission intensity is positively correlated with the firing temperature under 0.1 and 0.5 MPa gas pressure. The Sr2Si5N8:Eu2+ with the highest emission intensity was found at 1700°C and 1980°C under 0.1 and 0.5 MPa gas pressure, respectively. Although the maximum emission intensity of Sr2Si5N8:Eu2+ obtained under 0.5 MPa gas pressure condition is higher than that under 0.1 MPa. The Sr2Si5N8:Eu2+ synthesized under 0.5 MPa gas pressure in the temperature range from 1600°C to 1800°C have lower emission intensities than that synthesized under 0.1 MPa indicating that the melting of Sr3N2 is an important step for the formation of Sr2Si5N8:Eu2+. Moreover, the Sr2Si5N8:Eu2+ undergoes phase transition into SrSi6N8:Eu2+ completely after elongating the heating duration to 6 h at 1980°C under 0.5 MPa gas pressure. The same feature was observed under 0.1 MPa gas pressure after firing 8 h at 1750°C. Different heating durations led to different degrees of phase transition.

Preparation of a Sr2-xEuxSi5N8 Phosphor Using an Ion Transporter

“…Thus, it is difficult to obtain a pure phase of Sr 2 Si 5 N 8 using an oxide as a starting material. In addition, the Sr 2 Si 5 N 8 , SrSiN 2 , 21 SrSi 6 N 8 22 and SrSi 7 N 10 23 phases have been reported to be formed commonly. As mentioned, high synthetic temperatures are required to synthesize the Sr 2 Si 5 N 8 crystal phase, and multiple phases are often formed.…”