Abstract
Ho3+-modified SrBi4Ti4O15 ceramics with bright green light emission and enhanced electrical properties were fabricated by a conventional solid-state reaction method. Upon visible light irradiation, samples exhibit a strong green emission located at 546 nm and a weak red emission at 653 nm. These two emissions corresponding to the intra f-f transition from the excited state 5S2 to the ground state 5I8 and the 5F5→5I8 transition of Ho3+, respectively. The relative intensity of green and red emissions is related to the Ho3+ contents closely, due to the concentration quenching effect. Moreover, it is also found that Ho3+ doping significantly enhanced the electrical properties. At x = 0.008, samples exhibit optimal electrical properties and excellent piezoelectric temperature stability for the SBT-xHo system. These results reveal that these materials have good application prospect in future optical temperature sensors by integrating its luminescent and piezoelectric properties.
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