期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 67, 页码 17756-17766出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201803473
关键词
conjugated polymer nanoparticles; diarylethenes; fluorescence; photoactivity; photoswitch
资金
- National Natural Science Foundation of China [51503015, 51673022]
- State Key Laboratory for Advanced Metals and Materials [2018Z-18]
- Fundamental Research Funds for the Central Universities [FRF-TP-17-003A2]
Photochromic diarylethene derivatives, which can reversibly switch the fluorescence of adjacent fluorophores between the ON and OFF states under light irradiation, have been widely used to construct photoswitchable materials. Herein, eight dithienylethene (DTE) groups are integrated onto one polyhedral oligomeric silsesquioxane (POSS) core, obtaining a novel super molecular photoswitch. After being doped into conjugated polymer nanoparticles, the POSS-DTE8 molecules show a higher contrast on/off photoswitching performance and a quicker responsive speed than free DTE molecules at same molar concentration of photochromic units. This enhanced photoswitching efficiency is attributed to the increased molecular interaction of the ring-open form and lowered energy of the ring-closed form of the DTE units on the POSS core, which is beneficial for the ring-closing reaction and subsequent energy transfer between photoswitch and fluorophores. In addition, POSS-DTE8 also exhibits good photomodulation behavior in the conjugated polymer film, giving it potential applications in optical devices.
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