Abstract
The conjugated polymer poly {[2-[2′,5′-bis(2″-ethylhexyloxy)phenyl]-1,4-phenylenevinylene]-co-[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene]} (B-co-MP) has been proven to be an excellent laser medium with a high photochemical stability. Moreover, the impact of γ-irradiation on its optical and chemical properties has been investigated. Herein, the spectral and amplified spontaneous emission (ASE) characteristics of B-co-MP at various concentrations under γ-irradiation doses are studied. Various concentrations of B-co-MP in tetrahydrofuran (THF) were prepared. The samples were irradiated with various γ-doses from 5 to 20 kGy using a Co-60 source at room temperature. The absorption, fluorescence, and ASE spectra were dramatically blue-shifted after the γ-irradiation. This indicates that the increment in the γ-irradiation dose led to a widening in the energy gap and reduction in the number of carbon atoms (N). The change in the spectral profiles could be attributed to chain conformational alterations and/or chain scission induced by the γ-irradiation. We anticipate this study to boost our understanding of optical and structural profiles of B-co-MP under various conditions, including γ-irradiation and the potential utility of this copolymer in a variety of applications.
Highlights
Conjugated polymers have drawn considerable attention due to their great number of applications in different disciplines such as light-emitting diodes (LEDs) and luminescent solar cells, as well as their low cost and facile synthesis [1,2,3,4,5]
Many fluorescent organic compounds, including laser dyes, have a low fluorescence quantum yield under high concentrations due to reabsorption processes, and cannot emit laser light [15]
The intensity decreased by increasing the concentration and the spectrum’s peak position red-shifted towards and became fixed at 580 nm [17,18]
Summary
Conjugated polymers have drawn considerable attention due to their great number of applications in different disciplines such as light-emitting diodes (LEDs) and luminescent solar cells, as well as their low cost and facile synthesis [1,2,3,4,5]. The PPV conjugated polymers have a strong absorption and emission, a significant Stokes shift, a high luminescence, and a fluorescence quantum yield, and emit laser light even at higher concentrations. In 1992, researchers discovered that a liquid conjugated polymer (MEH-PPV) produced yellow/red wavelengths that generated laser action. The intensity decreased by increasing the concentration and the spectrum’s peak position red-shifted towards and became fixed at 580 nm [17,18]. The red2u.5c4tion in the conjugation length caused a blue shift in the prominent absorption spectra of the irradiated 3sa.3m.
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