Enhanced phosphorescence in N contained Ba2SiO4:Eu2+ for X-ray and cathode ray tubes

Abstract A bluish-green color long-lasting phosphorescent phosphor of N contained Ba 2 SiO 4 :Eu 2+ for X-ray and cathode ray tubes are prepared with the chemical component formula Ba 2 SiO 4 :0.01Eu 2+  −  x Si 3 N 4  − 2BaCO 3 ( x  = 0.1 to 1.0) by the conventional high-temperature solid-state method. The phosphorescence and fluorescence properties as a function of Si 3 N 4 content and temperature are investigated. The emission spectra show a single broad band peaking at 505 nm, which are ascribed to the 4f 6 5d 1  → 4f 7 transition of Eu 2+ . Thermoluminescence (TL) glow-curves show that Ba 2 SiO 4 :0.01Eu 2+ without N holds a high-temperature peak at 417 K. With increasing the content of Si 3 N 4 , the phosphorescence grows super-linearly and some new TL peaks appear at low temperatures of about 400, 355, 365, and 335 K. These peaks are ascribed to the formation of new traps related to N substitution for O.