Abstract A real high power vacuum ultraviolet light source is applied to the investigation on the vacuum ultraviolet irradiation degradation of BaMgAl10O17:Eu2+ phosphor. The degradations of emission intensity and colour quality of sample are clearly observed after irradiation. It reveals that the oxidation of Eu2+ during irradiation is partly responsible 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 host to Eu2+ and finally result in the degradation.
Fund: Project supported by the National Natural Science Young Foundation of China (Grant No. 10904057) and the Fundamental Research Funds for Central Universities, China (Grant No. Lzjbky-2011-125).
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
