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, Eunkyoung Kim

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Abstract

The photophysical properties of near-infrared (NIR) emissive aza-boron-dipyrromethene (aza-BDP) dyes incorporating nitrofluorene and alkoxy decorations were intensively investigated. Their highly reversible one-electron reduction process showed characteristic electrofluorochromic (EF) properties in the NIR range, depending on the substituents. The nitrofluorene ethynyl-substituted (Type I) dyes showed smaller EF effects than the alkoxy-containing (Type II) dyes because of the difference in their intrinsic fluorescence contrast between the neutral and reduced states (radical anion). In addition, the Type II chromophores showed a larger diffusion coefficient for ion transport, which enhanced the EF contrast and the response time for the fluorescence change at a given step potential. With an optimized condition, the NIR EF ON/OFF ratio reached a value of 6.1 and a long cyclability over 1000 EF cycles between -0.4V and +0.4V switching potentials, with approximately 20% loss of the initial ON/OFF switching ratio. The NIR EF switching was visually observed through a visible light cut-off filter, featuring high fluorescence contrast.

Original languageEnglish
Article number18867
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Jan 6

All Science Journal Classification (ASJC) codes

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    Lim, H., Seo, S., Pascal, S., Bellier, Q., Rigaut, S., Park, C., Shin, H., Maury, O., Andraud, C., & Kim, E. (2016). NIR Electrofluorochromic Properties of Aza-Boron-dipyrromethene Dyes. Scientific reports, 6, [18867]. https://doi.org/10.1038/srep18867