Degradation mechanisms of the blue-emitting phosphor BaMgAl_(10)O_(17)∶Eu~(2+) under baking and VUV-irradiating treatments

摘要

The luminescent properties of an Eu~(2+)-activated hexagonal aluminate, BaMgAl_(10)O_(17) (BAM), were studied under 147- and 254-nm excitations. The BAM samples were thermally treated by baking and then irradiated in vacuum ultraviolet (VUV) rays. The results show that the emission efficiency of Eu~(2+) in BAM under 147-nm excitation degraded seriously after baking or VUV-irradiating treatments, while no significant degradation was observed under 254-nm excitation. The degree of degradation depended on the excitation wavelength, and the absorption edge of the BAM host was suggested to be close to 175nm (7.2eV). The differences between the thermal-induced and the VUV-irradiation-induced degradations, and their mechanisms are discussed for the color plasma display applications.