Optical behaviour of coumarin dye in PVA and PMMA film matrices. (June 2018)

• Record Type: Journal Article
• Authors: Bisen, R.; Tripathi, J.; Sharma, A.; Khare, Ayush; Kumar, Yogesh; Tripathi, S.
• Is Part Of: Vacuum. Volume 152(2018)
• Page Start: 65
• Page End: 69
• Publication Date: 2018-06
• Subjects: PVA -- PMMA -- Coumarin -- Self-standing -- XRD -- SEM -- Optical properties; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2018.03.004
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: To understand the molecular level interaction of Coumarin dopant with the polymer host, we have performed optical and structural characterizations of PVA and PMMA self-standing films by doping Coumarin in two concentrations viz. 0.1 wt% and 1 wt%. It was observed that PMMA host matrix is more affected by doping in comparison with PVA matrix, which shows bond modifications and crystallization with small doping. The band-edges are observed to shift, thereby lowering the band-gaps of the base polymers upon doping. While the changes are seen only below the absorption edge in PVA, PMMA exhibits alterations in both the band edge and overall transmission in the range of 300–900 nm. The results are interpreted in terms of the molecular level inclusion of Coumarin molecules in polymer hosts. Highlights: PVA & PMMA self-standing films were prepared by doping Coumarin 0.1 wt% and 1 wt%. PMMA host matrix is more affected by doping in comparison with PVA matrix. Band edges shift lowering the band gaps of the base polymers upon doping. PMMA exhibits alterations in both band edge and overall transmission (300–900 nm). The results are interpreted in terms of molecular level inclusion of Coumarin.