2018
DOI: 10.1002/adma.201805661
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On‐Demand Control of the Photochromic Properties of Naphthopyrans

Abstract: minutes/hours to completely return to the CF. The residual color imparted by the TT form and the slow thermal back-reaction of the TC form are considered as problems to be solved. [9][10][11][12][13] The thermal backreaction speed of colored naphthopyrans can be modulated by the introduction of an electron-donating group at the para position of the 3-phenyl ring. [4] However, substitution at the 3-phenyl ring typically causes significant changes in the color of the colored species. Although the speed of the th… Show more

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Cited by 71 publications
(55 citation statements)
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“…In particular, the abil ity to tune the coloration rate on demand can significantly improve the security level of the recorded texts, because different informa tion would appear using various irradiation times. To date, progress has been made in the regulation of colorability and coloration rates by incorporation of electron donor or acceptor substitutions in photo chromic molecules (17,18). Nevertheless, the prepared photochromic materials generally have constant colorability and coloration rates under the same light irradiation condition (19)(20)(21)(22)(23)(24)(25).…”
Section: Introductionmentioning
confidence: 99%
“…In particular, the abil ity to tune the coloration rate on demand can significantly improve the security level of the recorded texts, because different informa tion would appear using various irradiation times. To date, progress has been made in the regulation of colorability and coloration rates by incorporation of electron donor or acceptor substitutions in photo chromic molecules (17,18). Nevertheless, the prepared photochromic materials generally have constant colorability and coloration rates under the same light irradiation condition (19)(20)(21)(22)(23)(24)(25).…”
Section: Introductionmentioning
confidence: 99%
“…[1][2][3][4] Among them, fast thermally reversible (T-type) photochromic molecules, whose photogenerated colored species quickly and automatically reverts to the initial species by heat, have been paid particular attention because these fast photoswitching properties are promising for various industrial applications, such as ophthalmic lenses, [5] dynamic holographic materials, [6,7] fluorescent switching dyes for bioimaging. [8][9][10] Therefore, a number of fast photochromic compounds have been reported so far such as bridged imidazole dimers, [11][12][13][14][15] naphthopyrans, [16][17][18][19][20] oxazines, [21,22] and diarylethene derivatives. [23,24] Phenoxyl-imidazolyl radical complex (PIC) is one of the recently developed rate-tunable T-type photochromic compounds which reversibly generates an imidazolyl radical and a phenoxyl radical (ring-opening form) in a molecule by UV light irradiation (Scheme 1a).…”
Section: Introductionmentioning
confidence: 99%
“…The SP is isomerized to the merocyanine (MC) upon the illumination of UV light, in which the sp 2 hybridization and π–π: transition lead to the light absorption. [ 28,29 ] The thermal reversion from MC to SP occurs at room temperature or at the exposure of visible light, which is suitable for the use of ordinary circumstances. To achieve the capability of broadband light regulation, we used SP dyes D 1 , D 2 , and D 3 that have different central wavelengths of the absorption peak at 550, 430, and 570 nm, respectively.…”
Section: Figurementioning
confidence: 99%