首页|(162877)Modulating trap levels via co-doping Ca2 + /Si4+ in LiTa03:Pr3+ to improve both the intensity and threshold of mechanoluminescence
(162877)Modulating trap levels via co-doping Ca2 + /Si4+ in LiTa03:Pr3+ to improve both the intensity and threshold of mechanoluminescence
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NSTL
Elsevier
We report a novel mechanoluminescent phosphor Li_(1-x)Ca_xSi_xTa_(1-x)O_3:0.01Pr~(3+) (x = 0-0.04). The crystal structure, photoluminescence (PL), optical diffuse reflectance spectra, afterglow (AG), fluorescence decay curves, and mechanoluminescence (ML) properties were investigated. To clarify the defect types and the mechanoluminescence mechanisms, an X-ray photoelectron spectroscopy (XPS) and thermoluminescence curve (TL) were measured. The dopants Ca~(2+) and Si~(4+) ions occupied the Li+ and Ta~(5+) sites, respectively. An optimal sample Li_(0.98)Ca_(0.02)Si_(0.02)Ta_(0.98)O_3:Pr~(3+) was obtained with great enhancement in mechanoluminescence intensity, higher than that of non-doped sample LiTaO_3:Pr~(3+) by 262%. And the compression threshold, over which the ML intensity could not maintain the linear increase, has also been greatly improved. Furthermore, the stable output of Tribo-L was achieved, which was visible to the naked eye. A probable mechanism was proposed to illustrate the mechanoluminescent process in Lil-xCaxSixTal-xO3:0.01Pr3 + (x = 0-0.04). The study indicates that adjusting trap distribution by substituting host ions may be a novel way to develop high-quality mechanoluminescence.
Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Functional Materials Research Laboratory, School of Materials Science and Engineering, Tongji University, 4800 Cao'an Road, Shanghai 201804, China
NSTL
Elsevier
