Study the effective addition of coumarin dye on the optical properties of poly (methyl meth acrylate)

The effect of adding different volume coumarin dye (5, 15, 25 and 35) ml on optical properties Poly (Methyl Meth Acrylate) was studied. Films pure PMMA with were prepared using the casting technique. Transmission absorption films measured by UV-VIS spectrometer technique type (100 Conc), in order to assess transmission which found an indirect transition. An energy gap is (4.95e v) after (25, ml, for decrease (0.05) compere addition appear equal (4.1 e v). It that coefficient, extinction coefficient dielectric constants increasing coumarin.