Electric and photoluminescence properties of Eu³⁺-doped PZN-9PT single crystal

Eu³⁺-doped 0.91Pb(Zn_1/3Nb_2/3)O₃-0.09PbTiO₃ (PZN-9PT: Eu) single crystals were grown by the flux technique. The phase structure, ferroelectric, dielectric, and photoluminescence properties of the crystal were investigated. The PZN-9PT: Eu crystal has a pure perovskite structure. The residual polarization P_r, coercive field E_c, total bipolar strain, and unipolar stain are 36.7664 μC/cm², 11.0597 kV/cm, 0.35%, and 0.12%, respectively. The coercive field E_c of PZN-9PT: Eu crystal is three times higher than that of PZN-9PT crystal. The Curie temperature T_c of the PZN-9PT: Eu crystal is about 172 °C which is slightly higher than that of PZN-PT single crystal. Under the excitation of 464 nm laser, four broadband peaks appear around 593 nm, 613 nm, 657 nm, and 716 nm, corresponding to the ⁵D₀ → ⁷F_J (J = 0, 1, 2, 3, 4) transition emission, respectively. The luminescence intensity of all the emission peaks decreases with increasing temperatures range from 298 to 393 K. Our results can provide a new way for the design of multifunctional materials used in optical-electrical devices.