Electric and optical properties of Tm3+/Yb3+co-doped PZN–9PT crystals
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Tm3+/Yb3+co-doped Pb(Zn1/3Nb2/3)O3–9PbTiO3 (PZN–9PT) single crystals were grown by high-temperature flux technique. The effects of Tm3+/Yb3+ ions doping on phase structure, dielectric, ferroelectric and UC luminescence properties were investigated. The XRD, Raman spectrum and TEM results reveal that the Tm3+/Yb3+ ions can diffuse into the lattice of the PZN–9PT and increase the lattice constants. The Curie temperature Tc increases from 170 °C for pure PZN–9PT to 182.5 °C for PZN–9PT: Tm3+/Yb3+. Meanwhile, the coercive field Ec of Tm3+/Yb3+ co-doped PZN–9PT reaches to 12.1 kV/cm which is nearly four times higher than that of PZN–9PT crystal. Under a 980 nm laser excitation, crystals modified by the Tm3+/Yb3+ produce UC with three colors: blue (480 nm, 1G4 → 3H6), strong near-infrared (NIR, 804 nm, 3H4 → 3H6) and weak red (652 nm, 1G4 → 3F4). Our results can provide a new way for the design of multifunctional materials used in optical-electrical devices.
This work was supported by the National Natural Science Foundation of China (Grant No. 51772235), the National Basic Research Program of China (973 Program) (Grant No. 2013CB632900),the Shaanxi Key Laboratory Fundament Research Foundation (Grant No. 14JK1333) and Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices (Grant No. 2015SZSJ-59-5).
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