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NIR Electrofluorochromic Properties of Aza-Boron-dipyrromethene Dyes
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This paper demonstrates highly reversible electrofluorochromic (EF) switching with near-infrared (NIR) emissive aza-BDP (aza-boron-dipyrromethene) dyes. The NIR emission was achieved using two different series of aza-BDP dyes, incorporating nitrofluorene ethynyl (Type I) and alkoxy (Type II) functionalization at 3/5, 1/7, or 2/6 positions. Both types of chromophore exhibited NIR emission between 700 nm and 800 nm with a moderate quantum yield. Interestingly, both types of dyes showed a reversible one-electron reduction process; however, the EF properties were significantly different. Because of the electron-withdrawing nitro group on the Type I dyes, the fluorescence quenching of the radical anion state was not fully quenched. However, the Type II dyes exhibited a higher switching contrast because of the absence of an electron-withdrawing group. |
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SCIENTIFIC REPORTS, Volume: 6, Article Number: 18867, DOI: 10.1038/srep18867, Published: JAN 6 2016
NIR Electrofluorochromic Properties of Aza-Boron-dipyrromethene Dyes
Hanwhuy Lim, Seogjae Seo, Simon Pascal, Quentin Bellier, Stéphane Rigaut, Chihyun Park, Haijin Shin, Olivier Maury, Chantal Andraud, and Eunkyoung Kim