White light emission, quantum cutting, and afterglow luminescence of Eu(3+)-doped Ba(5)Gd(8)Zn(4)O(21)

• Published in: Journal of alloys and compounds Vol. 577; pp. 170 - 173
• Main Authors: Yang, Yanmin, Li, Ziqiang, Li, Zhiqiang, Jiao, Fuyun, Su, Xianyuan, Ge, Dayong
• Format: Journal Article
• Language: English
• Published: 15-11-2013
• Subjects: Afterglows; Cutting; Emission; Excitation; Luminescence; Phosphors; White light; X-rays
• ISSN: 0925-8388

Ba(5)Gd(8)Zn(4)O(21):xEu(3+) (x=0.05%, 0.5%, 1%, 2%, 5%, and 10%) phosphors were prepared by a conventional high-temperature solid-state reaction. White light emission was generated by the combined (5)D(0,.1,2,3)-(7)Fo.(0,1,2,3) transitions of Eu(3+) in Ba(5)Gd(8)Zn(4)O(21) under 395 nm excitation. More interestingly, when the same phosphor was excited by ultraviolet (274 nm) and X-ray, the intense red emission were achieved and it is interpreted by efficient quantum cutting between Gd(3+) and Eu(3+). The cutting efficiency of Ba(5)Gd(8)Zn(4)O(21):1%Eu(3+) was calculated to be around 169% under X-ray excitation. Furthermore, after X-ray irradiation, the phosphors showed an intense long-lived afterglow luminescence and the luminescence can be modulated via sintering temperature.