Ayyappanpillai Ajayaghosh, Kizhumuri P. Divya, Sampath Srinivasan
The present invention is to provide highly solid state emis sive fluorophores of the formula 1 and 2 useful for the solid state lighting . The formula 1 and 2 have good solid state emission in blue and green region respectively . The zinc complexes of formula 1A and 2A have yellow and red emission respectively in solid state . The present invention also provide high solid state emissive assay of formula 1 and 2 to convert UV light into visible light by coating the color tunable materials on the 365 – nm emitting solid state LED . The present invention further provides carbazole end capped bipyridine for screening of metal salts with different counterions in solutions . The discrimination of the various metal salts can be monitored by noting the fluorescence change in solution . The zinc salts with different counterions have different emission color in solution . The present inven tion also develop a new two photon active fluorescent Zn2 + specific probe for detecting Zn2 + in cellular environments . Assay with formula 3 is used as a fluorescent probe for two photon imaging of Zn2 + ions in HeLa cells . The high two photon absorption cross section and fluorescence quantum yield of formula 3 made it as a useful probe for detecting Zn2 + in cellular environment by two photon excited fluo rescence imaging.