Ce 3+ ion doped BiPO 4 phosphors were synthesized by co-precipitation method using ethylene glycol as capping agent. The prepared phosphors were characterized by XRD, SEM, FT-IR, UV-Vis, and PL spectroscopy techniques. The formation of monoclinic phase was confirmed from XRD and FT-IR studies. SEM study revealed the rice shape morphology of BiPO 4 :Ce 3+ (7at.%). In the photoluminescence analysis, a broad emission band extending in a wide wavelengths range with maxima around 419 and 470 nm was observed under excitation at 370 and 417 nm, respectively. These emission bands are originated from the electronic transitions, viz., 5d → 2 F 5/2 , 2 F 7/2 of Ce 3+ ion. The emission intensity was accentuated with the increase of Ce 3+ ion till 7at.% and subsequently attenuated with further increase of Ce 3+ ion concentration; which is due to the concentration quenching effect. The BiPO 4 :Ce 3+ (7at.%) sample was characterized for the feasibility of photocatalytic degradation of methylene blue under UV light irradiation and degradation of 90% of the dye was degraded within 120 minutes was observed. From the results, it is believed that the prepared BiPO 4 :Ce 3+ may have potential applications in solid state lighting as well as in photocatalysis for the degradation of organic dyes.
In this study, the absorption spectra due to the interaction between Pr(III) and l-tryptophan system exhibiting 4f-4f transitions in presence and absence of Zn(II) using different aquated organic solvents such as methanol, dioxane, acetonitrile and N,N-dimethylformamide (DMF) were investigated and the same were also analyzed for the equimolar mixtures (1:1) of two different solvents. The energy parameters such as Slater-Condon (F K ) factor, Lande spin-orbit coupling constant ( 4f ), Nephelauxetic ratio ( ) , bonding parameter (b 1/2 ) and percent covalency ( ) , are also calculated and the observed variation in these parameters with the change of solvents indicates the nature of bond formed between Pr(III) and l-tryptophan. The oscillator strength (P) and Judd-Ofelt parameters T λ (λ = 2, 4, 6) have also been determined for the four transitions namely 3 H 4 to 3 P 2 , 3 P 1 , 3 P 0 and 1 D 2 .The solvent DMF has the most effective for the promotion of 4f-4f electric dipole intensity.
Graphic abstractComparative absorption spectra of Pr(III):l-Tryptophan in different solvents.
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