Pure organic room-temperature phosphorescent(RTP)materials have been attracting widespread attention due to the unique properties and broad applications.However,RTP materials with the adjustable photochromic property ...Pure organic room-temperature phosphorescent(RTP)materials have been attracting widespread attention due to the unique properties and broad applications.However,RTP materials with the adjustable photochromic property are still a challenge.Based on this,two polymers containing hexaarylbiimidazole are strategically designed with dual emission of both fluorescence and phosphorescence.Furthermore,both polymers show sensitive photochromic responses from faint yellow to brown upon exposure to ultraviolet light.This study can enrich pure organic luminescent systems and provide new ideas for functional RTP materials.展开更多
This paper reported the synthesis of hexaar- ylbiimidazole-tetraphenylethene （HABI-TPE） conjugated photochromic fluorophore, which simultaneously exhib- ited photochromic property, condensed state enhanced emission ...This paper reported the synthesis of hexaar- ylbiimidazole-tetraphenylethene （HABI-TPE） conjugated photochromic fluorophore, which simultaneously exhib- ited photochromic property, condensed state enhanced emission and reversible fluorescence switching. Upon UV irradiation, a green species with a broad absorption band between 550 and 800 nm（ the absorption maximum at 697 nm ） was observed, which readily faded to colorless in the darkness. HABI-TPE launched strong fluorescence with the maximum emission wavelength at 520 580 nm under the excitation with 450-500 nm visible light in condensed state, which is in contrast to nonfluorescence in solution. The maximum emission wavelength in condensed state was dependent of excitation wavelength. More interest- ingly, HABI-TPE exhibited reversible fluorescence switch- ing upon alternating irradiation with blue or near-UV light （wavelength less than 490 nm） and green light （more than 490 nm） in condensed state. Our evaluation demonstrated that HABI-TPE exhibited great photoswitchable fluores- cence, which is a promising photoswitchable fluorophore for localization-based super-resolution microscopy, evi- dencing by resolving nanostructures with sub-100nm resolution in polymethylmethacrylate films.展开更多
o-Chloro-hexaarylbiimidazole (o-CI-HABI) can be sensitized efficiently by cyanine dyes, the cyclopentanone and cyclohexanone dyes, when exposed to xenon lamp (use filter cut lambda less than or equal to 400 nm). The p...o-Chloro-hexaarylbiimidazole (o-CI-HABI) can be sensitized efficiently by cyanine dyes, the cyclopentanone and cyclohexanone dyes, when exposed to xenon lamp (use filter cut lambda less than or equal to 400 nm). The photoreaction between the photoinitiator and the dyes was completed through an electron transfer process. Excellent results have been obtained in photoimaging studies, e.g. the resolution of the image can reach 7 mum. The influence of the content of the dyes and the heat after the exposure on the resolution of the image was investigated.展开更多
基金This work was supported by the National Natural Science Foundation of China(21788102,22020102006,21871083,21722603)Shanghai Municipal Science and Technology Major Project(2018SHZDZX03)+2 种基金the Program of Shanghai Academic/Technology Research Leader(20XD1421300)Shanghai Municipal Education Commission and Shanghai Education Development Foundation(19SG26)the Innovation Program of Shanghai Municipal Education Commission(2017-01-07-00-02-E00010)and the Fundamental Research Funds for the Central Universities.
文摘Pure organic room-temperature phosphorescent(RTP)materials have been attracting widespread attention due to the unique properties and broad applications.However,RTP materials with the adjustable photochromic property are still a challenge.Based on this,two polymers containing hexaarylbiimidazole are strategically designed with dual emission of both fluorescence and phosphorescence.Furthermore,both polymers show sensitive photochromic responses from faint yellow to brown upon exposure to ultraviolet light.This study can enrich pure organic luminescent systems and provide new ideas for functional RTP materials.
文摘This paper reported the synthesis of hexaar- ylbiimidazole-tetraphenylethene （HABI-TPE） conjugated photochromic fluorophore, which simultaneously exhib- ited photochromic property, condensed state enhanced emission and reversible fluorescence switching. Upon UV irradiation, a green species with a broad absorption band between 550 and 800 nm（ the absorption maximum at 697 nm ） was observed, which readily faded to colorless in the darkness. HABI-TPE launched strong fluorescence with the maximum emission wavelength at 520 580 nm under the excitation with 450-500 nm visible light in condensed state, which is in contrast to nonfluorescence in solution. The maximum emission wavelength in condensed state was dependent of excitation wavelength. More interest- ingly, HABI-TPE exhibited reversible fluorescence switch- ing upon alternating irradiation with blue or near-UV light （wavelength less than 490 nm） and green light （more than 490 nm） in condensed state. Our evaluation demonstrated that HABI-TPE exhibited great photoswitchable fluores- cence, which is a promising photoswitchable fluorophore for localization-based super-resolution microscopy, evi- dencing by resolving nanostructures with sub-100nm resolution in polymethylmethacrylate films.
文摘o-Chloro-hexaarylbiimidazole (o-CI-HABI) can be sensitized efficiently by cyanine dyes, the cyclopentanone and cyclohexanone dyes, when exposed to xenon lamp (use filter cut lambda less than or equal to 400 nm). The photoreaction between the photoinitiator and the dyes was completed through an electron transfer process. Excellent results have been obtained in photoimaging studies, e.g. the resolution of the image can reach 7 mum. The influence of the content of the dyes and the heat after the exposure on the resolution of the image was investigated.
