Combination of Strong Blue Up-Conversion Photoluminescence and Greatly Enhanced Ferroelectric Polarization in Tm3+-Yb3+-W6+- Doped Bi4Ti3O12 Thin Films

Abstract

A strong blue up-conversion photoluminescence and a greatly enhanced ferroelectric polarization were observed in Tm 3þ -Yb 3þ -W 6þ -triply-doped bismuth titanate thin films. The thin films were prepared on fused silica and Pt=Ti=SiO 2 =Si (111) substrates by chemical solution deposition and annealed at 700 C. The strong blue up-conversion emission centered at 478 nm, corresponding to 1 G 4 ! 3 H 6 transitions of Tm 3þ ions, was confirmed to be a three-photon energy-transfer process by pumping laser power dependence of emission intensity. The enhanced ferroelectricity with a high remnant polarization (Pr) value of about 32 lC=cm 2 is attributed to the weakened domain pinning due to the reduced oxygen vacancies by W 6þ substitution for Ti 4þ ions. The thin films combining the strong blue up-conversion photoluminescence with the good ferroelectric properties would provide possibility of realizing novel multifunctional optoelectronic integration device applications.

Structure and dielectric properties of solid solutions Bi7Ti4+xWxNb1−2x−0.1V0.1O21 (x=0.1−0.4)

“…APs are promising materials for use in the design and fabrication of high temperature piezoelectric sensors operating under extreme conditions. Moreover, these materials are considered as elements for nonvolatile ferroelectric random-access memory (FeRAM) devices 4,5 and as multifunctional materials that exhibit magnetic properties (multiferroics), 6,7 photoluminescence, [8][9][10] etc. A substantial variability of the composition due to the substitution of A-and B-ions, as well as of the crystal structure due to variations in the number of layers m ¼ 1-6, made it possible to obtain a large number of APs.…”

Large electrostrain and high optical temperature sensitivity in BaTiO3-(Na0.5Ho0.5)TiO3 multifunctional ferroelectric ceramics

“…25 From then on, RE ion doped ferroelectric oxide materials have received more interest among several research groups. 36,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55] The electrostriction effect and optical thermal sensitivity in RE ion doped ferroelectric materials were reported for Er-doped ferroelectric 0.5Ba(Zr 0.2 Ti 0.8 )O 3 -0.5(Ba 0.7 Ca 0.3 )TiO 3 ceramics in 2014 by Du et al 24 although the electrostriction (0.104%) and the optical thermal sensitivity (≤0.0044 K −1 ) are still improvable. A high electrostrain (0.203%) was successfully obtained in our work, 14 but the optical temperature sensitivity (≤0.0042 K −1 ) 56 is still lower than that of the Er-doped BaTiO 3 nanocrystal materials.…”

Structure and dielectric properties of solid solutions Bi7Ti4 + x W x Nb1 − 2x O21 (x = 0–0.5)

“…At present, considerable interest has been expressed in Aurivillius phases owing to potential practical applications asso ciated with their extraordinary properties. Aurivillius phases are promising materials for use in the design and fabrication of high temperature piezoelectric sen sors operating under extreme conditions; moreover, these materials are considered as elements for nonvol atile ferroelectric random access memory (FeRAM) devices [4,5] and as multifunctional materials that exhibit magnetic properties (multiferroics) [6,7], photoluminescence [8][9][10], etc.…”