Abstract
LnNbO4:Er3+ (Ln = Lu, Y, Gd) phosphors were prepared through a conventional solid-state reaction method. The phase purity of the samples was characterized by X-ray diffraction (XRD). A comparative study of spectral and temperature sensing properties of LnNbO4:Er3+ (Ln = Lu, Y, Gd) phosphors was presented. The excitation spectra of the samples show a strong band in the region of 200–350 nm coming from the NbO44−, thus indicating efficient energy transfer from the host to Er3+. From the dependence of upconversion (UC) luminescence spectra on laser diode working current, it was confirmed that 2- and 3-photon processes were respectively responsible for both the green and the red UC emissions under 980 and 1550 nm excitations. The temperature sensing properties for LnNbO4:Er3+ were compared under individual excitation of 980 and 1550 nm. It was found that the temperature sensing was independent from the excitation wavelength, but LuNbO4:Er3+ phosphors yielded the highest luminescence intensity and maximum temperature sensitivity.
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