Photoluminescence Properties of Er/Pr‐Doped K_0.5Na_0.5NbO₃ Ferroelectric Ceramics

Abstract

Er/Pr-doped K 0.5 Na 0.5 NbO 3 ceramics have been fabricated and the effects of Pr 3+ on their photoluminescence properties have been investigated systematically. The visible upconversion emissions, near-infrared and mid-infrared downconversion emissions of Er 3+ ions under the excitation of 980 nm have been studied in detail. The effects of Pr 3+ on PL properties and energytransfer processes have also been elucidated. By selecting an appropriate excitation source, simultaneous visible downconversion emissions of Er 3+ and Pr 3+ ions can be realized, and the emission colors of the ceramics can be tuned via the concentration of Pr 3+ ions in a wide range from yellowish green to yellow. Our results also reveal that the photoluminescence emissions of the ceramics can be enhanced by the alignment of polarization of the ferroelectric host.

Up-conversion luminescence and optical temperature-sensing properties of Er3+-doped perovskite Na0.5Bi0.5TiO3 nanocrystals

“…The latter was demonstrated that many ferroelectric materials, such as BaTiO 3 , Bi 4 Ti 3 O 12 , K 0.5 Na 0.5 NbO 3 [9] and Na 0.5 Bi 0.5 TiO 3 , are suitable for using as luminescent hosts. Among these materials, Sodium bismuth titanate (Na 0.5 Bi 0.5 TiO 3 , NBT) is considered to be one of the most promising luminescent ferroelectric host.…”

Reversible luminescence modulation of Ho‐doped K0.5Na0.5NbO3 piezoelectrics with high luminescence contrast

“…Among these methods, ion doping (e.g., metal ions, transitional metal ions, or lanthanide ions) is widely used to enhance their piezoelectric properties. In particular, lanthanide (Ln) ion doping not only endows KNN‐based materials with the fascinating optical properties, but also can improve their intrinsic ferro‐/piezoelectric properties . The coexistence of luminescent and ferro‐/piezoelectric properties are encouraging for the researchers, which can further expand the application fields of KNN‐based materials as a kind of multifunctional devices by integrating their luminescent and ferro‐/piezoelectric properties.…”

In-situ Electric Field-Induced Modulation of Photoluminescence in Pr-doped Ba0.85Ca0.15Ti0.90Zr0.10O3 Lead-Free Ceramics

“…The uneven crystal field can mix opposite-parity states into the 4f configuration level and then increase the 4f-4f electric dipole transition probability of Pr 3+  1618. Apparently, the polarization switching and phase transformation have opposite effects on PL emissions, and, on the basis of the results (Fig.…”

“…4. Three strong excitation peaks arising from the excitations of Pr 3+ from the 3 H 4 ground level to the 3 P 2 , 3 P 1 and 3 P 0 excited levels are observed at 450, 473 and 487 nm, respectively1839. Accordingly, the photoluminescence (PL) emission spectrum of the ceramic has been measured under an excitation of 450 nm, giving the results shown in Fig.…”

“…Low-symmetry hosts typically exert a crystal field containing more uneven components around the dopant ions compared with high-symmetry counterparts1618. The uneven components enhance the electronic coupling between 4f energy levels and higher 4f5d configuration and subsequently increase f–f transition probabilities of the dopant ions19.…”