Control of near-infrared dye fluorescence lifetime in all-polymer microcavities

Megahd, Heba; Brito, Mariela Villarreal; Lanfranchi, Andrea; Stagnaro, Paola; Lova, Paola; Comoretto, Davide

doi:10.1039/d2qm00313a

Cited by 5 publications

(5 citation statements)

References 60 publications

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“…Thus, we can conclude that there is a spectral redistribution of the PL intensity, corresponding to a redistribution of the oscillator strength within the DBR. This is a clear feature of the photonic band structure, consistent with previous findings in the literature, and is controlled by the local density of photonic states (LPDOS). ,,,,− Indeed, for an emitter embedded in a homogeneous medium with refractive index n , the LPDOS shows the typical n ν 3 dependence (ν is the photon frequency). , However, the PhC structure, with its periodic modulation of the refractive index, deeply changes the surrounding medium and leads to a corresponding change in the LPDOS, which is minimum (no photonic states available) at the PBG, while at its edges, the conservation rule for the oscillator strength requires the LPDOS to increase. Far away from the PBG, the LPDOS is not affected.…”

Section: Resultssupporting

confidence: 84%

“…Since the PBG shift is related to the known dispersion of the photonic band structure, we assume that the observed effect on the PL spectra is intrinsic to the photonic band structure of the DBR and not to the emitters. These results are in full agreement with the theory, ,,− confirming recycled polymer materials do have a future for plastic photonics. To highlight the properties related to the photonic band structure of our system, Figure c shows the ratio between the PL spectra of the DBR recorded at different collection angles and the spectrum of the reference CA film.…”

Section: Resultsmentioning

confidence: 99%

“…Reflectance, transmittance, and fluorescence spectra (excitation at 405 nm, 10 mW power) were recorded using a home-built system described previously that allows angle-resolved detection …”

Section: Methodsmentioning

confidence: 99%

“…Reflectance, transmittance, and fluorescence spectra (excitation at 405 nm, 10 mW power) were recorded using a home-built system described previously that allows angle-resolved detection. 25 Scanning Electron Microscopy (SEM). SEM observations were carried out using a Tescan Mira3 LM FE on film cross sections obtained by brittle fracture of the samples in liquid nitrogen.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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From Landfill to Photonics: The Upcycling of Plastic Waste

Escher,

Magnasco,

Martorelli

et al. 2024

ACS Appl. Polym. Mater.

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The unrestrained use and improper disposal of plastics make their recycling and reuse an issue of paramount importance. This work aims to give a second life to polymeric materials in the field of photonics and shows that recycled polymers, which are often mixed with additives that affect their processability for such a challenging target, can be used for the fabrication of multilayered photonic crystals. We focus on simple methods to recover polystyrene from disposables and food packaging and cellulose acetate from cigarette butts. Also, we demonstrate the use of combustion residues filtered in the butts as fluorophores with impressive broadband luminescence that can be used to dope the photonic structures themselves. The optical quality of the fabricated photonic structures is comparable to that obtained with pure commercial polymers. However, changes in the optical response of the photonic crystals suggest that the formulation of the recycled material plays a crucial role in the growth steps. Also, a clear spectral redistribution is observed in the fluorescence of cellulose acetate derived from cigarette butts, confirming the quality of the photonic structures fabricated with recycled materials and fluorophores. Therefore, this fabrication approach opens the possibility of using recycled polymer waste for the growth of photonic and fluorescent nanostructures of high optical quality.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

“…Reflectance, transmittance, and fluorescence spectra (excitation at 405 nm, 10 mW power) were recorded using a home-built system described previously that allows angle-resolved detection …”

Section: Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

See 2 more Smart Citations

From Landfill to Photonics: The Upcycling of Plastic Waste

Escher,

Magnasco,

Martorelli

et al. 2024

ACS Appl. Polym. Mater.

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“…The optical performance of polymer DBRs have been demonstrated in several photonic fields. [33][34][35] The strong angle-dependent characteristics of the DBR filter is one of the key-enabling factors that allows to reach high sensing performance once the correct layout of integration is identified. Optical simulations are implemented, considering angle-and wavelengthdependent efficiencies of all components, to determine the optimal size and relative positioning of the elements in the integrated system, as well as to predict the output signal from the sensor.…”

Section: Introductionmentioning

confidence: 99%

On-chip organic optoelectronic system for fluorescence detection

Benvenuti,

Lanfranchi,

Moschetto

et al. 2024

J. Mater. Chem. C

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Stretchable Distributed Bragg Reflectors as Strain-Responsive Mechanochromic Sensors

Martusciello,

Lanfranchi,

Castellano

et al. 2024

ACS Appl. Mater. Interfaces

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Mechanochromic materials exhibit color changes upon external mechanical stimuli, finding wide-ranging applications in colorimetric sensing, display technology, and anticounterfeiting measures. Many of these materials rely on fluorescence properties and therefore necessitate external optical or electrical excitation. However, for broader applicability, the detection of color changes by the naked eye only or without complicated detection instrumentation is highly desirable. Photonic crystals offer a promising avenue for attaining such performances. In this work, we present elastomeric distributed Bragg reflectors (DBRs) characterized by a series of photonic bandgaps exhibiting mechanochromic response from the near-infrared to the visible wavelengths. To achieve this, we engineered alternating thin films of a thermoplastic fluoropolymer and a styrene−butadiene copolymer using different elastomeric substrates to attain different behaviors. The reported system demonstrates a reversible and instantaneous shift of the photonic bandgaps in response to 100% strain in multiple deformation cycles. Comparing the DBR stress−strain response with the optical strain response confirms a mechanochromic sensitivity of ∼1.7−6.9 nm/% and ∼80 nm/MPa, with an optical Poisson's ratio in the range 0.3−0.7. All these properties are spectrally dependent, as demonstrated by exploiting the properties of different diffraction order photonic band gaps.

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Control of near-infrared dye fluorescence lifetime in all-polymer microcavities

Abstract: The control of radiative decay rate is a crucial issue both for fundamental studies in quantum electrodynamics and for the development of efficient lasers, light emitting devices and photovoltaic cells....

Cited by 5 publications

References 60 publications

From Landfill to Photonics: The Upcycling of Plastic Waste

From Landfill to Photonics: The Upcycling of Plastic Waste

On-chip organic optoelectronic system for fluorescence detection

Stretchable Distributed Bragg Reflectors as Strain-Responsive Mechanochromic Sensors

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