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White light emission from fluorene-EDOT and phenothiazine-hydroquinone based D-π-A conjugated systems in solution, gel and film forms
Published in Royal Society of Chemistry
2017
Volume: 41
   
Issue: 18
Pages: 9741 - 9751
Abstract
Two conjugated D-π-A organic molecules, one fluorene-ethylene dioxythiophene (FL-E) based and another phenothiazine-hydroquinone (PT-Hq) based, were synthesized and observed to form 1-dimensional microstructures in the solid state. These two molecules when mixed with rhodamine B dye (Rh-B) and photoexcited at 411 nm generated white light with Commission Internationale d'Eclairage (CIE) coordinates (0.32, 0.33) in the solution state. Similarly, white light was also obtained in the poly(methyl methacrylate) film (0.30, 0.33) and in the gelatine gel (0.31, 0.34) for the same composition of the mixture as in the solution state. The correlated colour temperatures obtained in the three phases (6111 K in solution, 6900 K in the PMMA film and 6400 K in the gelatin gel) suggest that the system emits cool white light. In order to verify the D-π-A nature of the molecules, intramolecular charge transfer studies were conducted, which revealed that both the molecules showed positive solvatochromism. The plausible mechanism behind white light emission is Forster resonance energy transfer accompanied by simultaneous emission. This was verified through fluorescence titration experiments, lifetime studies, spectral overlap and Forster distance calculations and correlated with the results obtained from cyclic voltammetry and DFT studies. This is the first report on the emission of white light from the D-π-A system by FRET. © 2017 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
About the journal
JournalData powered by TypesetNew Journal of Chemistry
PublisherData powered by TypesetRoyal Society of Chemistry
ISSN11440546
Open AccessNo
Concepts (30)
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    Ethylene
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    Fluorene
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    FLUORENE ETHYLENE DIOXYTHIOPHENE
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    Gelatin
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    Hydroquinone
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    PHENOTHIAZINE
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    Poly(methyl methacrylate)
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    Rhodamine b
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    Unclassified drug
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    Article
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    Chemical composition
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    Chemical modification
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    Chemical structure
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    Conjugate
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    Cyclic potentiometry
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    Energy transfer
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    Field emission
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    Fluorescence analysis
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    Fluorescence resonance energy transfer
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    Gel
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    Light emitting diode
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    Molecule
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    Phase transition
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    Priority journal
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    Solid state
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    Structure analysis
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    Synthesis
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    Temperature
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    White light
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    WHITE LIGHT EMITTING DEVICE