Enhanced Photoluminescence of Mn2+ + Tb3+ Ions Doped Peo+pvp Blended Polymer Films

Abstract

Polymer blended films of PEO+PVP and singly doped and co-doped with Mn 2+ and Tb 3+ i o n s h a v e b e e n s y n t h e s i z e d b y solution casting method. Structural, thermal and optical properties of these films have been carried out. Thermal stability of these films has been investigated based on the measurement of TG-DTA profiles. Raman analysis demonstrates the complex formation of the polymer with the dopant ions. The optical absoption spectra of Mn 2+ a n d T b 3+ s e p e r a t e l y d o p e d polymers exhibits characteristic bands in octahedral symmetry. From the emission spectrum, two emission bands at 510nm (green) and 614nm (red) are attributed to the 4 T 1 6 A 1 , and 4 A 1 6 A 1 transition of Mn 2+ :PEO+PVP polymer fi l ms u n d er 3 7 0 n m exci t at i o n . In Tb 3+ d o p e d P E O + P V P p o l y m e r s a m p l e s e x h i b i t g r e e n e m i s s i o n a t 5 4 6 n m ( g r e e n ) d u e t o a transition of ( 5 D 4 7 F 5 ) under 370nm excitation. The enhanced r e d emission at 614nm of Mn 2+ ions is attributed to an effective energy transfer of Tb 3+ M n 2+ ions in the co-doped blended polymer film, which has been evidenced from the measurement of luminescence spectra and emission decay dynamics. These polymeric materials are suggested as bright visible colour luminescent materials.

Concentration, Temperature and Molecular Weight Dependent on Optical Properties of Poly (Vinyl Pyrrolidone) in Chloroform Solutions

“…The refractive index dependence on the molecular weight of PVP in chloroform, for selected three concentrations (0.3, 2.0 and 5.0%) and temperature 35 o C as an example, is demonstrated in Figure (3). It can be seen that the increasing of molecular weight rather rapid increase in the refractive index of these solutions.…”

“…Polymers in many instances can also tolerate easier shaping and better processing of the composite materials. Poly(vinyl pyrrolidone), PVP is one of the attractive polymers due to the strong affinity of the pyridine group and its ability to undergo the hydrogen bonding with polar species [3,4] . PVP does possess a unique combination of properties, such as environmental stability, with inert physicochemical properties over a broad range of pH values [5] , good solubility in both water and a range of organic solvents, a remarkable capacity to interact with a wide variety of organic and inorganic compounds, good biocompatibility, compatibility and resistance, and non-toxicity to living tissues.…”

Optical and morphological properties of ZnO and Alq3 incorporated polymeric thin layers fabricated by the dip-coating method

“…In both studies, the authors observed a blueshift in the luminescence of Alq 3 dispersed in PMMA matrix compared to pure Alq 3 film. The second polymer matrix used in this study was polyvinylpyrrolidone (PVP), which is attractive due to the strong affinity of the pyridine group and its ability to form a hydrogen bond with polar species (Kumar and Buddhudu 2014). Due to the fact that it binds very well with polar particles, it is used in coatings for photo-quality ink-jet papers (Aboud et al 2009).…”