Dazzling green emission from graphene oxide nanosheet-embedded co-doped Ce³⁺ and Tb³⁺:PVA polymer nanocomposites for photonic applications

Abstract

Novel dazzling green emission has been obtained from graphene oxide nanosheet-embedded Ce3+ and Tb3+:PVA polymer nanocomposites under UV excitation. The green emission of Tb3+ is enhanced by an energy transfer from Ce3+ to Tb3+ and GO NS to Tb3+.

Synthesis, structural, optical and electrical characterization of Y2O3/poly(ethylene glycol)–poly(vinyl chloride) based nanocomposite solid polymer electrolytes

“…This means that NC salt provides the YO/blend with more ions and charge carriers. In the co‐doped systems (YO and Li + or Na + ), the possible energy transfer between the dopants inside the blend matrix may be one of the reasons responsible for these improvements in the optical properties 14 …”

“…Such an increase is owing to (i) the formation of some new kinetic paths via polymer–YO boundaries; (ii) an increase in the number of charge carriers as YO is considered a semiconductor material, as mentioned before; 33 (iii) decrease in the crystallinity, as confirmed by Fig. 2; (iv) an increase of the porous structure as confirmed by SEM (Figs 3 and 4), which facilitates charge carrier transport through the pores besides the good dispersion of YO within the blend matrix; (v) some interactions between Li or Na cations and ClO 4 or Cl anions on the YO surface, which decreases the cation–anion pair interaction in the YO/blend matrix and increases the conductivity; 45 and (vi) the possible energy transfer between the dopants (YO and Li + or Na + ) inside the blend matrix which may be one of the reasons responsible for the enhanced conductivity 14 . As presented in Table 2, the 10 wt% NC/YO/blend NCSPE film has a maximum value of 7.40 × 10 −4 S cm −1 (at 373 K, 2 MHz), while the conductivity of the 5 wt% LC/YO/blend film is 6.0 × 10 −4 S cm −1 (at 373 K, 2 MHz).…”

“…improved the thermal and fluorescence emission properties of poly(styrene‐ co ‐butyl acrylate) by doping the polymer with Eu 3+ /Yb 3+ . Doping PVA with Ce 3+ , Tb 3+ and graphene oxide (GO) at certain concentrations yielded dazzling green emission that can be employed in photonic devices 14 …”

“…Doping PVA with Ce 3+ , Tb 3+ and graphene oxide (GO) at certain concentrations yielded dazzling green emission that can be employed in photonic devices. 14 The main aims of this study were to investigate (i) the effect of nano-sized Y 2 O 3 (YO) rare-earth oxide on the physical characteristics of PEG-PVC film; and (ii) the fabrication of NCSPE by mixing YO/PEG-PVC with some inorganic salts like NaClO 4 (NC) and LiCl (LC) to evaluate the impact of these salts on the structure, optical and electrical properties of the blend. The preparations were carried out by sol-gel and solution casting, which are facile, cheap and not time-consuming.…”

Enhanced dielectric properties of green synthesized Nickel Sulphide (NiS) nanoparticles integrated polyvinylalcohol nanocomposites*

“…The bands observed at 2916 and 1726 cm −1 may be attributed to C-H asymmetric stretching vibration (alkyl groups) and of C=O (vinyl acetate group) stretching vibration respectively [44]. The CH 2 bending vibration in the PVA backbone chain is represented by the band that appeared at 1431 cm −1 [45]. The CH 2 and C-H wagging vibrations are represented by the bands at 1363 and 1235 cm −1 respectively [17].…”