Abstract
Fluorescent guest molecules doped in polymers have been used to convert ultraviolet light into visible light for applications ranging from optical fibres to filters for the cultivation of plants. The wavelength conversion process involves the absorption of light at short wavelengths followed by fluorescence emission at a longer wavelength. However, a precise understanding of the light conversion remains unclear. Here we show light responses for a purified polystyrene base substrates doped with fluorescent benzoxanthene in concentrations varied over four orders of magnitude. The shape of the excitation spectrum for fluorescence emission changes significantly with the concentration of the benzoxanthene, indicating formation of a base substrate/fluorescent molecule complex. Furthermore, the wavelength conversion light yield increases in three stages depending on the nature of the complex. These findings identify a mechanism that will have many applications in wavelength conversion materials.
Highlights
Fluorescent guest molecules doped in polymers have been used to convert targeted light into longer wavelength light for applications ranging from optical fibres to films for the cultivation of plants
We characterize in detail the light response for a purified wavelength conversion material by varying the concentration of a fluorescent benzoxanthene derivative in a polystyrene base substrate over four orders of magnitude
Based on the fluorescent spectra and light yields over the large benzoxanthene concentration range, we reveal a complex between the polystyrene and the fluorescent benzoxanthene
Summary
Fluorescent guest molecules doped in polymers have been used to convert targeted light into longer wavelength light for applications ranging from optical fibres to films for the cultivation of plants. We show light responses for a purified polystyrene base substrates doped with fluorescent benzoxanthene in concentrations varied over four orders of magnitude. The wavelength conversion light yield increases in three stages depending on the nature of the complex These findings identify a mechanism that will have many applications in wavelength conversion materials. Plants do not efficiently utilize short-wavelength sunlight during photosynthesis To overcome these problems, wavelength conversion materials have been developed. These materials are polymers doped with fluorescent guest molecules that absorb light at shorter wavelengths and re-emit it at longer wavelengths[3,4]. We characterize in detail the light response for a purified wavelength conversion material by varying the concentration of a fluorescent benzoxanthene derivative in a polystyrene base substrate over four orders of magnitude. The repeat unit for polystyrene and the structure of the benzoxanthene derivative are shown in Fig. 1 and 2, respectively
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