Publication Date:
2015-05-09
Description:
A class of Yb 3+ /Er 3+ co-doped NaY(MoO 4 ) 2 upconversion (UC) phosphors have been successfully synthesized by a facile hydrothermal route with further calcination. The structural properties and the phase composition of the samples were characterized by X-ray diffraction (XRD). The UC luminescence properties of Yb 3+ /Er 3+ co-doped NaY(MoO 4 ) 2 were investigated in detail. Concentration-dependent studies revealed that the optimal composition was realized for a 2% Er 3+ and 10% Yb 3+ -doping concentration. Two-photon excitation UC mechanism further illustrated that the green enhancement arised from a novel energy-transfer (ET) pathway which entailed a strong ground-state absorption of Yb 3+ ions and the excited state absorption of Yb 3+ –MoO 4 2− dimers, followed by an effective energy transfer to the high-energy state of Er 3+ ions. We have also studied the thermal properties of UC emissions between 303 and 523 K for the optical thermometry behavior under a 980 nm laser diode excitation for the first time. The higher sensitivity for temperature measurement could be obtained compared to the previous reported rare-earth ions fluorescence based optical temperature sensors. These results indicated that the present sample was a promising candidate for optical temperature sensors with high sensitivity.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
