| 摘要 |
The efficiency and brightness of particulate, crystalline phosphors of oxysulfides on lanthanum series metals activated with trivalent metals having atomic numbers from 50 to 70, such as GD2O2O:Tb crystalline phosphors, containing 0.6 mol percent Tb and particularly those also containing 0.1 to 5 mol percent Dy are increased up to 2 to 3 times by treating the phosphors in a H2/SO2 atmosphere at a temperature from 750<o>C to 1,250<o>C for 15 minutes to 3 hours. Life tests have shown no decrease in brightness after 1,000 hours of tube operation. |
