Optimizing the upconversion photoluminescence of Er–Nb co-doped Bi4Ti3O12 ceramics by Ti divacancy defects
Abstract
To optimize the upconversion photoluminescence (UCPL) performance of rare-earth doped Bi4Ti3O12 Aurivillius-phase ceramics, it is critical to reveal the microstructure-property relationship. In this work, Er and Nb co-doped Bi3.7Er0.3NbyTi3−yO12 (y=0,0.01,0.02,0.04,0.06) ceramics were synthesized via a solid-state reaction. The x-ray diffraction analysis confirmed their phase-pure orthorhombic without a secondary phase. Compared to Bi3.7Er0.3Ti3O12, the intensities of 528 and 661 nm emission peaks of UCPL spectra for Bi3.7Er0.3Nb0.02Ti2.98O12 are 2.5 and 2.2 times increased, respectively. Experimental and theoretical calculation results of positron annihilation lifetime spectroscopy and coincidence Doppler broadening revealed the presence of VTi monovacancy and VTi–Ti divacancy defects within these ceramics. As demonstrated by the UCPL and the positron annihilation results, the enhancement of UCPL performance of Er–Nb co-doped Bi4Ti3O12 ceramics is predominantly determined by the VTi–Ti divacancy defects.
Article Details
Journal Info
Journal of Applied Physics
American Institute of Physics
Authors (5)
H. R. Cheng
State Key Laboratory of Particle Detection and Electronics, Department of Modern Physics, University of Science and Technology of China , Hefei 230026,
Y. W. Chen
State Key Laboratory of Particle Detection and Electronics, Department of Modern Physics, University of Science and Technology of China , Hefei 230026,
Y. H. Li
State Key Laboratory of Particle Detection and Electronics, Department of Modern Physics, University of Science and Technology of China , Hefei 230026,
J. D. Liu
State Key Laboratory of Particle Detection and Electronics, Department of Modern Physics, University of Science and Technology of China , Hefei 230026,
B. J. Ye
State Key Laboratory of Particle Detection and Electronics, Department of Modern Physics, University of Science and Technology of China , Hefei 230026,