1] Kyoto University, 2 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan [2] National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage-ku, Chiba 263-8555, Japan.
Sci Rep. 2013;3:2502. doi: 10.1038/srep02502.
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.
聚合物中掺杂的荧光客体分子已被用于将紫外光转换为可见光，其应用范围从光纤到植物培养过滤器。波长转换过程涉及短波长光的吸收，随后在较长波长处发生荧光发射。然而，对于光转换的确切理解仍不清楚。在这里，我们展示了用浓度跨越四个数量级的荧光苯并氧杂蒽掺杂的纯化聚苯乙烯基质的光响应。荧光发射的激发光谱的形状随苯并氧杂蒽的浓度显著变化，表明形成了基质/荧光分子配合物。此外，根据配合物的性质，波长转换的光产率分三个阶段增加。这些发现确定了一种机制，该机制将在波长转换材料中有许多应用。
