期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 19, 期 30, 页码 19984-19991出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp02818k
关键词
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资金
- University of Melbourne's Early Career Researcher Grant Scheme [6-F004]
- Australian Research Council [DE130100615, DP1095404]
- University of Melbourne's Early Career Research Grant Scheme
- Linkage Infrastructure, Equipment and Facilities [LE150100049]
- Australian Research Council [LE150100049, DE130100615, DP1095404] Funding Source: Australian Research Council
The spectroscopic properties of poly(methyl methacrylate) polymer films doped with two kinds of photochromic molecular switches are investigated. A green-fluorescent sulfonyl diarylethene (P1) is combined with either a non-fluorescent diarylethene (P2) or red-fluorescent spiropyran (P3). Photoswitching between the colorless and colored isomers (P1: o-BTFO4 <-> c-BTFO4, P2: o-DTE <-> c-DTE, P3: SP <-> MC) enables the P1 + P2 and P1 + P3 films to be cycled through three distinct states. From the initial state (o-BTFO4 + o-DTE/SP), irradiation with UV light generates the second state (c-BTFO4 + c-DTE/MC), where c-BTFO4 -> c-DTE/MC energy transfer is established. Irradiation with green light then generates the third state (c-BTFO4 + o-DTE/SP), where the energy transfer acceptor is no longer present. Finally, irradiation with blue light regenerates the initial state. For the P1 + P2 film, only one state is fluorescent, with the irradiation inputs required to be entered in the correct order to access this state, acting as a keypad lock. For the P1 + P3 film, the states emit either no fluorescence, red fluorescence, or green fluorescence, all using a common excitation wavelength. Additionally, once the fluorescence is activated with UV light, it undergoes a time-dependent color transition from red to green, due to the pairing of P-type and T-type photochromes. These multi-photochromic systems may be useful for security ink or imaging applications.
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