News from Nanotechjapan


Emission of White Light from a Single Fluorescent-Dye---Synthesis of Organic Compound with pH-Controlled Multi-color Fluorescence---

 On August 5, 2016, Gifu University and Japan Science and Technology Agency (JST) announced that a collaborative research group led by Professor Toshiaki Murai of Gifu University has succeeded in developing a fluorescent-dye which emits light with various wavelengths from a single dye molecule by changing pH of the dye solution. Details were published in Chemistry Open*.

 Color or wavelength of light emitted from a material is determined by the corresponding energy of electron transition from its excited state to the ground state. Fluorescent light with natural white color is usually made up from a mixture of three primary colors emitted from three different fluorescent materials.

 The research group has synthesized a new fluorescent dye, 5-N-arylaminothiazoles containing pyridyl groups. Color or wavelength of the fluorescent dye can be changed by adding triflic acid to its solutions in diethyl ether (Et2O). Color measurements showed a linear change from blue to orange on the International Commission on Illumination coordinates. The emission of white light was accomplished from the single fluorescent dye by adjusting the ratio of dye to acid.

 *Kirara Yamaguchi, and Toshiaki Murai, Jing-Dong Guo, Takahiro Sasamori, and Norihiro Tokitoh, "Acid-Responsive Absorption and Emission of 5-N-Arylaminothiazoles: Emission of White Light from a Single Fluorescent Dye and a Lewis Acid", Chemistry Open, Early View, published: 2 August 2016, DOI: 10.1002/open.201600059