A real high power vacuum ultraviolet light source is applied to the investigation on the vacuum ultraviolet irra- diation degradation of BaMgAl10O17：Eu2＋ phosphor. The degradations of emission intensity and color qu...A real high power vacuum ultraviolet light source is applied to the investigation on the vacuum ultraviolet irra- diation degradation of BaMgAl10O17：Eu2＋ phosphor. The degradations of emission intensity and color quality of the sample are clearly observed after irradiation. It reveals that the oxidation of Eu2＋ during irradiation is partly respon- sible for the degradations. The excitation and absorption spectra show that some traps generated during irradiation have negative influence on the luminescence of sample and these traps have been identified as positively charged oxygen vacancies by positron annihilation. The investigations on host emission and decay curve further confirm that these oxygen vacancies are involved in the perturbation of energy transfer from the host to Eu2＋ and finally result in the degradation.展开更多
The mechanisms of thermal,ultraviolet and vacuum ultraviolet radiation degradation behaviors of the Eu2+,Mn2+ co-doped BaMgAl10O17 phosphors were investigated comparatively.The result indicated that the Mn2+ ions whic...The mechanisms of thermal,ultraviolet and vacuum ultraviolet radiation degradation behaviors of the Eu2+,Mn2+ co-doped BaMgAl10O17 phosphors were investigated comparatively.The result indicated that the Mn2+ ions which replaced the Mg2+ sites in the sample were stable and negligibly influenced by treatments.The oxidation and migration of Eu2+ ions primarily caused the thermal degradation of the sample.The vacuum ultraviolet radiation degradation was primarily because of the migration of Eu2+.The ultraviolet radiation increased traps which trended the Eu2+r to be in a metastable state,leading to the ultraviolet radiation degradation of the sample.The vacuum ultraviolet excited luminous loss of samples after ultraviolet radiation partly originated from the interruption of energy transfer from the host to activators by traps.展开更多
基金Project supported by the National Natural Science Young Foundation of China(Grant No.10904057)the Fundamental Research Funds for Central Universities,China(Grant No.Lzjbky-2011-125)
文摘A real high power vacuum ultraviolet light source is applied to the investigation on the vacuum ultraviolet irra- diation degradation of BaMgAl10O17：Eu2＋ phosphor. The degradations of emission intensity and color quality of the sample are clearly observed after irradiation. It reveals that the oxidation of Eu2＋ during irradiation is partly respon- sible for the degradations. The excitation and absorption spectra show that some traps generated during irradiation have negative influence on the luminescence of sample and these traps have been identified as positively charged oxygen vacancies by positron annihilation. The investigations on host emission and decay curve further confirm that these oxygen vacancies are involved in the perturbation of energy transfer from the host to Eu2＋ and finally result in the degradation.
基金supported by the National Natural Science Young Foundation of China(Grant No.10904057)the Fundamental Research Funds for the Central Universities(Grant No.Lzjbky-2011-125)+1 种基金the National Science Foundation for Distinguished Young Scholars(Grant No.50925206)the National Natural Science Foundation of China(Grant No. 10874061)
文摘The mechanisms of thermal,ultraviolet and vacuum ultraviolet radiation degradation behaviors of the Eu2+,Mn2+ co-doped BaMgAl10O17 phosphors were investigated comparatively.The result indicated that the Mn2+ ions which replaced the Mg2+ sites in the sample were stable and negligibly influenced by treatments.The oxidation and migration of Eu2+ ions primarily caused the thermal degradation of the sample.The vacuum ultraviolet radiation degradation was primarily because of the migration of Eu2+.The ultraviolet radiation increased traps which trended the Eu2+r to be in a metastable state,leading to the ultraviolet radiation degradation of the sample.The vacuum ultraviolet excited luminous loss of samples after ultraviolet radiation partly originated from the interruption of energy transfer from the host to activators by traps.
