Abstract
Er3+/Yb3+/Li+‐tridoped Y2Ti2O7 nanophosphors were synthesized via a facile sol–gel process. The samples were characterized by the inductively coupled plasma atomic emission spectrometer (ICP‐AES), X‐ray diffraction (XRD), transmission electron microscopy (TEM), and infrared‐to‐visible upconversion (UC) luminescence spectra. XRD analysis showed that the crystallization temperature of pyrochore‐type Y2Ti2O7 was reduced due to the flux effect of Li+ ions, whereas TEM measurements confirmed that the particles size of (Y0.815Er0.01Yb0.075Li0.10)2Ti2O7 was about 30–40 nm when calcining at 800°C for 1.0 h. The calcining temperature and Li+ ion concentration dependence on UC luminescence spectra were investigated. It was found that, when incorporating 10.0 mol% Li+ ion, the UC red and green emission intensity was drastically increased by a factor of 18.6 and 8.3, respectively. The enhancement of UC emission may be mainly attributed to the modification of local symmetry around Er3+ ions by tridoping Li+ ions. And also, the pump power dependence of the emission intensity was investigated to understand the fundamental UC mechanism.
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