Abstract
Trivalent lanthanide ions are widely used for the realization of scintillation, while the narrow transition lines do not benefit the overall integral intensity. In this work, Mn 2+ doped LiLuF 4 NPs are employed to realize strong broad emission for the first time. Upon X-ray irradiation, the strong broad emission from 500 to 700 nm corresponding to the Mn 2+ : 4 T 1 → 6 A 1 transition is observed. Through incorporating Ce 3+ and Gd 3+ ions, the X-ray excited optical luminescence (XEOL) intensity is greatly improved owing to the introduce of energy transfer pathways of Gd 3+ →Mn 2+ and Ce 3+ →Gd 3+ →Mn 2+ . After coating a LiLuF 4 shell, both the XEOL intensity and X-ray irradiation stability are improved. Our results may promote the exploration of new kinds of scintillators with broad band emissions. • Mn: LiLuF 4 NPs are employed to realize strong broad emission for the first time. • Gd 3+ ions are used to improve the XEOL intensity via Gd 3+ .→Mn 2+ energy transfer. • Ce 3+ ions are used to improve the XEOL intensity via Ce 3+ .→Gd 3+ →Mn 2+ energy transfer. • A LiLuF 4 shell is used to improve both the XEOL intensity and X-ray irradiation stability.
Published Version
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