A New Biphotochromic Fluorescent Switch Based on Dithienylethene and Triphenylethylene: Synthesis, Crystal Structure, and Optical Waveguide. Issue 19 (13th July 2022)

• Record Type: Journal Article
• Authors: Luo, Miao; Zhao, Juan; Liu, Yanyan; Jiang, Long; Wang, Sheng; Chi, Zhenguo
• Is Part Of: Advanced optical materials. Volume 10:Issue 19(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-13
• Subjects: aggregation‐induced enhanced emission -- dithienylethene -- multi‐color fluorescence -- optical waveguide -- photochromism -- triphenylethylene; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202201195
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: A novel biphotochromic fluorescent switch molecule N‐2F derived from dithienylethene (DTE) and triphenylethylene (TPE) is reported. Interestingly, different photochromic and fluorescence phenomena of N‐2F are observed in tetrahydrofuran/water mixtures. When fw ≤ 50%, N‐2F shows effective photochromic and fluorescent switch under alternating with 254 and 500 nm light irradiation due to the DTE unit undergoing reversible cyclization and cycloreversion reactions between its open and closed forms. However, when fw ≥ 60%, the strong blue‐green fluorescence of the original solution is almost quenched under 254 nm light irradiation, but becomes red fluorescent emission under 500 nm light irradiation. When further irradiated with 254 nm, the red fluorescent emission disappears, but it reappears upon 500 nm light illumination. The results reveal that DTE and TPE take cyclization and cycloreversion reactions upon alternating with 254 and 500 nm light irradiations, and TPE will take dehydrogenation reaction with further 254 nm irradiation. Moreover, N‐2F can easily obtain long length (about 2 cm) rod single crystal with high fluorescence quantum yield of 68.97%. Impressively, N‐2F shows excellent optical waveguide with very low loss coefficient of 0.171 dB mm −1 . Therefore, N‐2F exhibits potential applications in anti‐counterfeiting, multi‐color display, and functional photonic devices. Abstract : A new biphotochromic fluorescent switch N‐2F based on dithienylethene and triphenylethylene is successfully synthetized. Interestingly, N‐2F shows different photochromic and luminescence properties in tetrahydrofuran/water mixed solutions, and importantly easily forms rod single crystal with excellent optical waveguide. The results demonstrate N‐2F is a good candidate as multifunctional stimulus‐responsive material that is useful in anti‐counterfeiting and functional photonic devices applications.