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All of them are stable in ambient conditions in solutions and fluorescent in cyclohexane. The fluorescence of the radicals with bromo, phenyl, 4\u2010chlorophenyl, or 2\u2010pyridyl substituents are enhanced in chloroform, while the emission of the radicals with 2\u2010thienyl or 2\u2010furyl substituents are quenched in chloroform. DFT and TD\u2010DFT calculations indicate that the first doublet excited states of the former are locally excited, while the first doublet excited states of the latter are charge transfer states from the \u03c0\u2010electron\u2010donating substituent to the accepting radical. The latter also show much higher photostability under 370\u2010nm light irradiation compared with the first reported photostable fluorescent radical, (3,5\u2010dichloro\u20104\u2010pyridyl)bis(2,4,6\u2010trichlorophenyl)methyl radical (PyBTM), with pronounced bathochromic shifts of the fluorescence.\n                  <\/jats:p>","DOI":"10.1002\/asia.202100612","type":"journal-article","created":{"date-parts":[[2021,7,16]],"date-time":"2021-07-16T08:57:16Z","timestamp":1626425836000},"page":"2538-2544","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Expansion of Photostable Luminescent Radicals by\n                    <i>Meta\u2010<\/i>\n                    Substitution"],"prefix":"10.1002","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9281-0403","authenticated-orcid":false,"given":"Yohei","family":"Hattori","sequence":"first","affiliation":[{"name":"Materials Chemistry Course Faculty of 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