Photonic band gap effect and dye-encapsulated cucurbituril-triggered enhanced fluorescence using monolithic colloidal photonic crystals

It is well known that enhanced fluorescence of dye molecules can be achieved by the formation of host-guest complexes that enhance the efficiency of chemical sensors, bio-imaging and photovoltaic devices. Herein, dual enhancement in fluorescence intensity was obtained by tuning three-dimensional (3D...

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Published inNew journal of chemistry Vol. 43; no. 41; pp. 16264 - 16272
Main Authors Vipin, V. V, Chandran, Parvathy R, Ramachandran, Animesh, Mohamed, A. P, Pillai, Saju
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 21.10.2019
Subjects
Absorption spectra
Chemical sensors
Colloid chemistry
Dyes
Fluorescence
Group velocity
Microspheres
Organic chemistry
Photonic band gaps
Photonic crystals
Photons
Photovoltaic cells
Polystyrene resins
Reflectance
Rhodamine
Supramolecular compounds
Thickness
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Summary:It is well known that enhanced fluorescence of dye molecules can be achieved by the formation of host-guest complexes that enhance the efficiency of chemical sensors, bio-imaging and photovoltaic devices. Herein, dual enhancement in fluorescence intensity was obtained by tuning three-dimensional (3D) periodic architectures of colloidal photonic crystals (CPCs) and host-guest chemistry. CPCs offer an appropriate platform with slow photon effects at the edges of a photonic band gap (PBG). These photons with decreased group velocity facilitate enhanced excitation and light extraction, which aid fluorescence enhancement; meanwhile, the host-guest chemistry of rhodamine B (RhB) with cucurbit[7]uril (CB7) decreases aggregation-caused quenching, which provides additional fluorescence enhancement. We demonstrated the augmentation of fluorescence intensity of a model dye, RhB, using size-tuned polystyrene (PS) CPC films where RhB forms an inclusion complex with the host, CB7. Compared to a planar PS film (control sample), over 150-fold fluorescence enhancement was achieved using the monolithic CPC films. Our strategy for generating dual enhanced fluorescence can stimulate the ultra-sensitive detection capabilities of fluorescence-based chemical and biochemical sensors, providing stronger signals and lower limits of detection. Enhanced fluorescence was achieved by tuning the photonic band gaps in colloidal photonic crystals and host-guest chemistry.
Bibliography:3
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of RhB and CB-RhB
max
Av
10.1039/c9nj03328a
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and photographs of aqueous RhB in the presence of various molar ratios of CB7 are presented in Fig. S3, S4 and S5, respectively. The hydrodynamic diameters of PS microspheres of violet, green and orange CPCs are provided in Table S1. Fluorescence EF of MB on CPCs is summarized in Table S2. The fluorescence lifetimes
Electronic supplementary information (ESI) available: In Fig. S1. Reflectance spectra of violet and green coloured CPC films with different film thicknesses are provided. Absorption and fluorescence spectra of aqueous RhB solution are provided in Fig. S2. Absorption spectra, FL
on planar PS films are included in Table S3. See DOI
relative percentages and average life-times
ISSN:1144-0546
1369-9261
DOI:10.1039/c9nj03328a