Abstract
YNbO4 phosphors with various Er3+ and Yb3+ concentrations were synthesized via a traditional high-temperature solid-state reaction method. Their crystal structure was investigated by means of X-ray diffraction (XRD) and Rietveld refinements, and it was confirmed that the obtained samples exist in monoclinic phase. The Er3+ and Yb3+ concentration-dependent up-conversion (UC) luminescence was studied under 1550 nm excitation. By inspecting the dependence of UC intensity on the laser working current, it was found that four-photon and three-photon population processes were co-existent for generating the green UC emissions in the samples with higher Yb3+ concentrations. In addition, it was observed that the temperature sensing properties of YNbO4: Er3+/Yb3+ phosphors were sensitive to both Er3+ and Yb3+ doping concentrations. Furthermore, based on the obtained temperature response of the UC luminescence phosphors, 1550 nm laser-irradiation-induced thermal effect was studied, and it was discovered that the sample temperature was very sensitive to the doping concentrations of Er3+ and Yb3+ and the excitation power.
Highlights
Rare-earth (RE) ion-doped up-conversion (UC) luminescence materials have received considerable attention due to their widespread applications in many fields, such as UC lasers, sensors, solar cells, three dimension display and so on[1,2]
On the one hand, choosing proper trivalent RE ions used as absorption and emission centers in the design of UC luminescence materials is very important in order to obtain highly efficient UC emissions[4,5,6]
It can be found that the lattice constants decrease with the increase of both Er3+ and Yb3+ concentrations, which confirms the disordered lattice induced by the substitution of larger Y3+ (0.90 Å) by smaller Er3+ (0.88 Å) and Yb3+ (0.86 Å)
Summary
In order to identify the crystal structure of the as-prepared phosphors, XRD measurements were performed on all the samples. The results showed that all the samples almost had the same diffraction patterns. The crystallographic data of monoclinic YNbO4 (space group of C2/c (15), see JPCDS card No 83–1319) were used as the initial crystal structure model. All the observed diffraction peaks for those samples satisfy the reflection conditions, and our as-prepared samples are of monoclinic phase
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