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通过固相反应法制备了Ba_(0.835)Ca_(0.15)Ti_(1-x)In_xO_3:0.75%Er/0.75%Yb(BCTIO:Er/Yb)(0≤x≤2%)铁电陶瓷,研究了In掺杂对其铁电、介电、电输运、磁性以及上转换发光性能的影响,结果表明In掺杂对陶瓷的铁电和介电性能有所改善.在上转换发光方面,与没掺In的陶瓷相比,掺0.5%mol In的陶瓷发光性能显著提升,在550和665nm处的绿色和红色发光强度分别增强了1500%和5000%.在此基础上,我们将具有巨磁电阻效应的La_(0.67)Ca_(0.33)MnO_3(LCMO)薄膜生长在抛光后的BCTIO:Er/Yb陶瓷衬底上,构建了LCMO/BCTIO:Er/Yb磁电复合薄膜,发现该复合薄膜体系不仅具有量好的上转换发光性能,而且具有金属-绝缘体相变以及伴随着的巨磁电阻效应.磁测量表明LCMO薄膜表现出超顺磁性,这很可能是由于LCMO薄膜的晶粒尺寸很小(几十纳米)引起.这种同时具有上转换发光、铁电、压电和磁电阻效应的复合薄膜在光电子学和自旋电子学器件方面可能具有潜在的应用价值.
The Ba_ (0.835) Ca_ (0.15) Ti_ (1-x) In_xO_3: 0.75% Er / 0.75% Yb (BCTIO: Er / Yb) (0≤x≤2%) ferroelectric ceramics were prepared by solid- The effects of In doping on the ferroelectric, dielectric, electron transport, magnetic and upconversion luminescence properties of In are investigated. The results show that the In doping improves the ferroelectric and dielectric properties of ceramics. In the aspect of upconversion luminescence, Compared with ceramic without In, the luminescent properties of ceramic doped with 0.5% mol In significantly increased, and the green and red luminescence intensities increased by 1500% and 5000% respectively at 550 and 665nm.On this basis, we will have giant magnetism The resistivity effect of La_ (0.67) Ca_ (0.33) MnO_3 (LCMO) thin film grown on the polished BCTIO: Er / Yb ceramic substrate, LCMO / BCTIO: Er / Yb magnetoelectric composite film was constructed and found that the composite film system It not only has a good amount of upconversion luminescence, but also has a metal-insulator phase transition and the accompanying giant magnetoresistance effect. Magnetic measurements show that the LCMO films exhibit superparamagnetism, probably due to the small grain size of the LCMO films (Tens of nanometers), a composite film with both up-conversion luminescence, ferroelectric, piezoelectric and magnetoresistance effects in optoelectronics and at Spintronics devices may have potential applications.