Due to the color centers induced by Na/K volatilization and Sm-doping, Sm-doped KNN transparent ceramics exhibit photochromism and reversible modulations of transmittance/luminescence intensities.
High optical temperature sensing properties based on rare-earth-doped (K,Na) NbO 3 -based ferro-/piezoelectrics have attracted much attention due to their potential application in novel optoelectronic devices. Here, we fabricated Ho 3+ -doped (K 0.5 Na 0.5 )NbO 3 -SrTiO 3 transparent ceramics by conventional pressureless sintering. Their microstructures, transmittances, up-conversion photoluminescence, and optical temperature sensing properties have been characterized in details. Because of the cubic-like phase, dense, and fine-grained structure as well as relaxor-like feature, the ceramics exhibit high transmittance (~70%) in the near-infrared region. Owing to Ho 3+ , green and red up-conversion emissions have been observed, which can be easily modulated by temperature. The ceramics have stable emission colors (<200°C) and superior temperature-modulating emission color-tunable performance (>200°C). Furthermore, the temperature sensing behavior based on the thermally coupled levels ( 5 F 4 , 5 S 2 ) of Ho 3+ has been analyzed by a fluorescence intensity ratio technique. The transparent ceramics possess outstanding optical temperature sensitivity (~0.0096/K at 550 K), higher than most rare-earth-doped materials (e.g.
The Eu-doped K0.5Na0.5NbO3 pellucid ceramics were first prepared via the conventional solid-sate reaction, exhibiting light illumination-induced high-contrast photochromism of both optical transmittance and photoluminescence behaviors. Through thermal treatment, the optical...
Er 3+-doped Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 (xEr-BCTZ, x = 0, 0.005, 0.01, 0.015) multifunctional thick films were prepared by the tape-casting method, using sol-gel-derived nano-sized powders as the matrix material. The surface morphologies, photoluminescence, and electrical properties were investigated. Dense microstructures with pure perovskite structure were obtained in the thick films. By doping an appropriate amount of Er 3+ , the samples exhibit superior up-conversion photoluminescence performance and simultaneously enhanced electrical performances. In addition, relatively higher texture fractions (with the largest value of 83.5%) were realized through introducing plate-like BaTiO 3 templates to make the thick film grow by the [001] c orientation. And the ferro-/piezoelectric properties of the thick films were further improved, showing potential in the applications of micro-optoelectronic devices.
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