The invention provides an anthracene-based organic dye and a preparation method thereof. The organic dye provided by the invention has a structure of formula (I) or formula (II), wherein R.sub.a, R.sub.b, and R.sub.2-1 to R.sub.2-4 are as defined herein. The organic dye provided by the invention is obtained by modifying an anthracene with R.sub.a and R.sub.b or modifying anthracene-based groups decorated with an aryl group or a heteroaryl group with R.sub.a and R.sub.b, thereby the power conversion efficiency of a dye sensitized solar cell is significantly improved when the organic dye prepared according to the present invention is applied in a dye-sensitized solar cell. Furthermore, the preparation method of the organic dye according to the present invention is quite simple together with abundant raw materials and low cost, making it possible to be commercialized.

The invention provides an anthracene-based organic dye and a preparation method thereof. The organic dye provided by the invention has a structure of formula (I) or formula (II), wherein R.sub.a, R.sub.b, and R.sub.2-1 to R.sub.2-4 are as defined herein. The organic dye provided by the invention is obtained by modifying an anthracene with R.sub.a and R.sub.b or modifying anthracene-based groups decorated with an aryl group or a heteroaryl group with R.sub.a and R.sub.b, thereby the power conversion efficiency of a dye sensitized solar cell is significantly improved when the organic dye prepared according to the present invention is applied in a dye-sensitized solar cell. Furthermore, the preparation method of the organic dye according to the present invention is quite simple together with abundant raw materials and low cost, making it possible to be commercialized.

The invention provides an anthracene-based organic dye and a preparation method thereof. The organic dye provided by the invention has a structure of formula (I) or formula (II), wherein R.sub.a, R.sub.b, and R.sub.2-1 to R.sub.2-4 are as defined herein. The organic dye provided by the invention is obtained by modifying an anthracene with R.sub.a and R.sub.b or modifying anthracene-based groups decorated with an aryl group or a heteroaryl group with R.sub.a and R.sub.b, thereby the power conversion efficiency of a dye sensitized solar cell is significantly improved when the organic dye prepared according to the present invention is applied in a dye-sensitized solar cell. Furthermore, the preparation method of the organic dye according to the present invention is quite simple together with abundant raw materials and low cost, making it possible to be commercialized.

The invention provides an anthracene-based organic dye and a preparation method thereof. The organic dye provided by the invention has a structure of formula (I) or formula (II), wherein R.sub.a, R.sub.b, and R.sub.2-1 to R.sub.2-4 are as defined herein. The organic dye provided by the invention is obtained by modifying an anthracene with R.sub.a and R.sub.b or modifying anthracene-based groups decorated with an aryl group or a heteroaryl group with R.sub.a and R.sub.b, thereby the power conversion efficiency of a dye sensitized solar cell is significantly improved when the organic dye prepared according to the present invention is applied in a dye-sensitized solar cell. Furthermore, the preparation method of the organic dye according to the present invention is quite simple together with abundant raw materials and low cost, making it possible to be commercialized.

The present invention relates to dyes with pH-dependent absorption and fluorescence for pH detection and their applications in biology, medicine and theranostic. In particular, the present invention relates to compounds of the general formulae (I)-(IV), that show pH dependent absorption and fluorescence spectra as well as pH dependent fluorescence quantum yield, methods for their preparation and their application as pH-sensors and labeling groups for the detection of analytes.

The present invention relates to dyes with pH-dependent absorption and fluorescence for pH detection and their applications in biology, medicine and theranostic. In particular, the present invention relates to compounds of the general formulae (I)-(IV), that show pH dependent absorption and fluorescence spectra as well as pH dependent fluorescence quantum yield, methods for their preparation and their application as pH-sensors and labeling groups for the detection of analytes.