Thermographic properties of eight blue-emitting phosphors.

摘要

We examined the effect of temperature on the light absorption and emission properties of eight phosphorescent compounds. These phosphors are commercially produced powders that emit mainly in the blue region when illuminated with ultraviolet light in the range 220 to 400 mn. Excitation and emission spectra measured over the range 20 to 350(degrees)C are examined for these phosphors. Data from the emission spectra indicate that there is a significant temperature dependence in this temperature range. In all eight phosphors, the maximum relative intensity decreased as the temperature increased. In some samples, the emission bandwidth and position also changed with temperature. Of these phosphors, BaMg(sub 2)Al(sub 16)O(sub 27):Eu and Ba(sub 3)(PO(sub 4))(sub 2):Eu are candidates for studies at higher temperatures.