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The compounds\u2005<jats:bold>1\u2009b<\/jats:bold> and <jats:bold>2\u2009b<\/jats:bold>, in thin film form, showed an emission maximum at 713\u2005nm and 696\u2005nm, respectively, with the corresponding absolute solid\u2010state quantum yield of 3.3\u2009% and 9.0\u2009%. The fluorophores showed high emission in the doped state as well when dispersed in polystyrene (PS) matrix with emission maximum ranging from 536\u2005nm to 648\u2005nm with quantum yield in the range 12.4\u2009%\u201364.4\u2009%. The presence of dicyanovinyl (DCV) group in both the fluorophores was exploited towards cyanide sensing in DMSO leading to turn\u2010on fluorescence emission with high selectivity and sensitivity for cyanide ion with a detection limit of as low as 0.32\u2005\u03bc<jats:sc>m<\/jats:sc> (8\u2005ppb) for <jats:bold>1\u2009b<\/jats:bold> and 0.57\u2005\u03bc<jats:sc>m<\/jats:sc> (14\u2005ppb) for <jats:bold>2\u2009b<\/jats:bold>. DFT and TTDFT calculations suggested that the addition of cyanide ion prevented the intramolecular charge transfer (ICT) from the donor (PTz or EDOT) to acceptor (DCV), thereby turning the fluorescence \u201cOn\u201d. Using fluorescent spectral and color switching, we have explored logic gates with single and two input signal amplification by applying chemical and light inputs in the form of CN<jats:sup>\u2212<\/jats:sup> ion and UV.<\/jats:p>","DOI":"10.1002\/chem.201800216","type":"journal-article","created":{"date-parts":[[2018,5,7]],"date-time":"2018-05-07T21:46:31Z","timestamp":1525729591000},"page":"11042-11050","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["Phenothiazine Based Donor\u2013Acceptor Compounds with Solid\u2010State Emission in the Yellow to NIR Region and Their Highly Selective and Sensitive Detection of Cyanide Ion in ppb Level"],"prefix":"10.1002","volume":"24","author":[{"given":"Elumalai","family":"Ramachandran","sequence":"first","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Madras  Chennai 600 036 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Somasundaram A. 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