Photochrome-doped organic films for photonic key-pad locks and multi-state fluorescence

Ritchie, Chris, Vamvounis, George, Soleimaninejad, Hamid, Smith, Trevor, Bieske, Evan J., and Dryza, Viktoras (2017) Photochrome-doped organic films for photonic key-pad locks and multi-state fluorescence. Physical Chemistry Chemical Physics. pp. 1-9.

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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.

Item ID: 49562
Item Type: Article (Research - C1)
ISSN: 1463-9084
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This article is licnesed under a Creative Commons Attribution 3.0 Unported licence.

Funders: Australian Renewable Energy Agency (ARENA), University of Melbourne (UM), Australian Research Council (ARC)
Projects and Grants: ARENA Post Doctoral Fellowship 6-F004, UM Early Career Researcher Grant, ARC DECRA Fellowship DE130100615, ARC Fellowship DP1095404, ARC Linkage Infrastructure Equipment and Facilities LE150100049
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Date Deposited: 17 Jul 2017 01:33
FoR Codes: 40 ENGINEERING > 4016 Materials engineering > 401608 Organic semiconductors @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 100%
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