Photodielectric Response and Photoluminescence of (K0.5Na0.5)NbO3-(Ca0.5Sm0.5)- (Mg0.5Nb0.5)O3 Ferroelectric Ceramics
LUO Wenliu1, YANG Ling1,*, YE Mao1, OU Yanghong2, XU Jiwen1, TANG Na1
1 School of Materials Science and Engineering, Guilin Universityof Electronic Technology, Guilin 541004, Guangxi, China 2 The 34th Research Institute of China Electronics Technology Corporation, Guilin 541004, Guangxi, China
Abstract: The change of the dielectric constant under illumination can be used to develop new-type light-controlled devices. (1-x)(K0.5Na0.5)NbO3-x(Ca0.5Sm0.5)(Mg0.5Nb0.5)O3(KNN-xCSMN, 0.02≤x ≤0.06) ceramics with different molar ratios were prepared by traditional solid-phase sintering method, and the structure and photoelectric response behavior were studied. When CSMN is introduced, the phase structure of ceramics changes from the orthogonal phase to the pseudo-cubic phase, and the grain size decreases significantly. An obvious photodielectric response is observed under the illumination of 365 nm light, and the dielectric tunability is up to about 249% at x=0.03 and a test frequency of 80 Hz. The increase in diffusion coefficient from 1.43 to 1.82 enhances the relaxation behavior of the ceramics, and the band gap decreases from 3.00 eV to 2.36 eV. A strong orange-red light is emitted under the illumination of 406 nm light. Meanwhile, the capacitance shows reversible switching characteristics at light-on and light-off states, and the switching ratio of capacitance at on/off states is about 3.5. These results will help to explore new noncontact devices, such as phototunable capacitive sensors and optical switches.
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2024, Vol. 38 
