High Efficient Vacuum Ultraviolet-Excitable SrSi2N2O2:Eu2+ Green-Emitting Phosphors Synthesized via Different Pressures

The luminescence properties of Eu2+-activated SrSi2N2O2 phosphor under VUV excitation have been firstly studied in this work. Normal pressure (1 atm) and high pressure (5 atm) synthesized- Sr0.96Si2N2O2:Eu-0.04(2+) powders were prepared by solid state reaction at temperature between 1400 degrees C and 1600 degrees C under 5% H295% N-2 atmosphere and 5 atm N-2 atmosphere, respectively. XRD patterns show that the purity and crystallinity of 1 atm-Sr0.96Si2N2O2:Eu-0.04(2+) is better than that of 5-atm Sr0.96Si2N2O2:Eu-0.04(2+). Green emission broad band at 541 nm with Full Width at Half Maximum (FWHM) of 75 nm can be efficiently excited under 172 nm. The luminescent intensity of 1 atm-Sr0.96Si2N2O2:Eu-0.04 (2+) is almost two folds than that of 5-atm Sr0.96Si2N2O2:Eu-0.04(2+). Moreover, photoluminescent spectra of Sr0.96Si2N2O2:Eu-0.04 (2+) with 10 K to 300 K were also carried out in this study. SrSi2N2O2:Eu2+ phosphor is a new and promising green phosphor for VUV applications.