Nanocomposite and nanomaterials

Peculiarities of fluorescence of multidomain dye HTTH in the nanocomposite polymer matrix.

Hudzenko I. I., Lopatynskyi A.M., Demydov P.V. and Chegel V.I.
V.E. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine, 41 Nauki Ave., Kyiv 03028, Ukraine.

The fluorescence of multidomain dyes is currently of the interest due to its possibilities for light wavelength tuning [1]. In this work, a comparative study of fluorescence of HTTH dye in different solvents and in polystyrene matrix was performed. The results show a noticeable difference in spectral characteristics of fluorescence depending on the surrounding dye environment. For irradiation of samples light sources with a wavelength of 365 and 405 nm (laser, LED) were used. Analyzing these spectra, the following conclusions can be done. The spectrum in toluene shows intense fluorescence in the range of 400-500 nm, which coincides with the published results [1]. Spectra under conditions of water environment and ethanol are distinguished by a red shift, whereas in the polymer matrix the spectral range of HTTH fluorescence is noticeably changed in comparison with the above mentioned one. This spectrum covers a range of 400-650 nm and exhibits greater intensity. The stability of the fluorescence signal in case of the polymer matrix should be noted, where during the year significant changes in fluorescence were not observed. The described changes in spectral characteristics could be explained by different conditions for proton transfer in environments with different polarity. Research shows the possibility to use this type of nanocomposite matrix in photonic devices.

1.	Zhiyun Zhang,Yi-An Chen,Wen-Yi Hung, et.al. Control of the Reversibility of Excited-State Intramolecular Proton Transfer (ESIPT) Reaction: Host-Polarity Tuning White Organic Light Emitting Diode on a New Thiazolothiazole ESIPT System // Chem. Mater.- 2016.- 28, -P. 8815−8824.