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However, the development of such molecules exhibiting photoactivable solid\u2010state fluorescence is still challenging due to the aggregation\u2010caused quenching (ACQ) effect of most fluorophores in their aggregate or solid states. In this work, we developed caged salicylaldehyde hydrazone derivatives, which are of aggregation\u2010induced emission (AIE) characteristics upon light irradiation, as efficient photoactivatable solid\u2010state fluorophores. These compounds displayed multiple\u2010color emissions and ratiometric (photochromic) fluorescence switches upon wavelength\u2010selective photoactivation, and were successfully applied for photopatterning and photoactivatable cell imaging in a multiple\u2010color and stepwise manner.<\/jats:p>","DOI":"10.1002\/chem.201406026","type":"journal-article","created":{"date-parts":[[2015,2,2]],"date-time":"2015-02-02T16:03:08Z","timestamp":1422892988000},"page":"4326-4332","source":"Crossref","is-referenced-by-count":56,"title":["Photoactivatable Aggregation\u2010Induced Emission Fluorophores with Multiple\u2010Color Fluorescence and Wavelength\u2010Selective Activation"],"prefix":"10.1002","volume":"21","author":[{"given":"Lu","family":"Peng","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yue","family":"Zheng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaoyan","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aijun","family":"Tong","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yu","family":"Xiang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2015,2,2]]},"reference":[{"key":"e_1_2_6_1_2","first-page":"63","volume-title":"Caged Fluorescent Probes, Vol. 291","author":"Mitchison T. 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