Energy conversion in 7-(Diethylamino)coumarin doped PMMA fluorescent fibre
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The article presents fabrication and spectroscopic characterization of 7-(Diethylamino)coumarin doped polymeric fibre. The poly(methyl methacrylate) (PMMA) was chosen as it assures direct doping possibility and excellent optical properties in fluorescence spectrum of used dye. The fabricated polymer exhibits an intense luminescence (at dye concentration 1.2 × 10−4 mol/l) in the range 505–537 nm (exc. 405 nm). Moreover, he coumarin doped PMMA fibre 600/1200 µm (doped core/cladding) fibre was fabricated and characterized. Presented fluorescence spectrum modification possibility can be used for new optical fibre construction optimization.
Keywords7-(Diethylamino)coumarin Polymeric optical fibre Poly(methyl methacrylate) Fluorescence Organic dyes
Mathematic Subject Classification160.4890 160.2540 160.5470
Photoluminescent complexes are wildly used in optical technology. The numerous applications of organic luminescent materials are well known in medicine (luminescent labeling, fluorescence-energy-transfer-based microscopy), environmental monitoring (water acidity and pollution) and numerous fields of scientific research (Resch-Genger et al. 2008; Basabe-Desmonts et al. 2007; Kasprzak et al. 2011; Lichtman and Conchello 2005; Lian et al. 2004; Merian et al. 2012; Rao et al. 2007). Fluorescent organic compounds (e.g. xanthenes, proteins, and polycyclic aromatic hydrocarbons) are wildly used due to their bright luminescence in the visible spectrum range (Miluski et al. 2015a; Johansson 1991; Al-Hamdani et al. 2010). Moreover, their broadband absorption spectrum allows efficient excitation using arc lamp (Hg, Xe), semiconductor LEDs, and laser diodes. Fluorescent molecules can be often incorporated into polymer structure without significant change their luminescent properties. In such circumstances, the rigid organic host gives an opportunity for new applications in optical fibre technology. The organic dyes can be incorporated in optical fibers based on thermoplastic polymers due to low drawing temperatures (much lower than used in optical glass technology). In fact, the poly(methyl methacrylate) is the most frequently used polymer for optical applications (Miluski et al. 2015b; Bilro et al. 2012). High transparency and well-developed processing technology of PMMA make it a good candidate for low-cost optical components and optical fibres fabrication (Miluski et al. 2016a, b). The step/gradient index and microstructured optical fibers can be fabricated using PMMA host (Miluski et al. 2016b; Tama et al. 2010; Bundalo et al. 2014; Kailasnatha et al. 2008; Oliveira et al. 2015; Huang et al. 2004; Barton et al. 2004). Moreover, the guiding properties of optical fibres can be used to obtain some specific advantages: optical signal amplification, amplified spontaneous emission (ASE), and energy transfer (Karimi et al. 2004; Dorosz et al. 2012; Arrue et al. 2011; Ayesta et al. 2011; Nihei et al. 1996). The optical amplifiers, sensors, and lasers based on fluorescent organic complexes were reported so far (Dorosz et al. 2012; Arrue et al. 2011; Ayesta et al. 2011; Nihei et al. 1996). The Stoke shift, mirror symmetry of absorption and emission spectra, high quantum yield and short lifetime (few ns) were reported in PMMA host doped by coumarins (Johansson 1991; Al-Hamdani et al. 2010; Kailasnatha et al. 2008). In fact, the coumarin derivatives are commonly used for optical fluorescence microscopy, OLEDs, and dye lasers (Achamma et al. 2002; Bangar Raju 1995; Donovalova et al. 2012; Hrdlovic et al. 2010). The proposed 7-(Diethylamino)coumarin doped PMMA fibre fabrication and fluorescence properties characterization is shown. Moreover, the reabsorption effect observed in optical fibre structure can be used for fluorescence spectrum modification.
2 The fabrication of coumarin doped optical fibre
The proposed 7-(Diethylamino)coumarin doped optical fibre exhibit interesting optical properties. The fluorescence (FWHM, λmax) can be optimized by the energy conversion process in polymeric optical fibre. The possibility of fluorescent spectrum shape modification can be used in new constructions of light sources based on direct energy conversion in polymeric optical fibres.
The 7-(Diethylamino)coumarin doped (1.2 × 10−4 mol/l) optical fibre was presented. The efficient luminescence was observed at 405 nm excitation. The measured absorbance and fluorescence spectra are presented. Moreover, the fluorescence spectrum shape parameters (FWHM, λmax) were measured for fabricated optical fibre and the reabsorption effect in optical fibre is presented. The 7-(Diethylamino)coumarin doped PMMA optical fibre can be used for new fibre optic light sources and optical amplifiers investigations.
The authors are grateful to Jan Mrazek from Institute of Photonics and Electronics of the Czech Academy of Sciences for help in excitation spectra measurements. This work was supported by Project No. S/WE/4/2013.
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