Color-Tunable White-Light-Emitting Materials Based on Liquid-Filled Capsules and Thermally Responsive Dyes

Vázquez-Mera, Nuria Alexandra; Otaegui, Jaume Ramon; Sánchez, Rafael Sánchez; Prats, G; Guirado, Gonzalo; Ruiz‐Molina, Daniel; Roscini, Claudio; Hernando, Jordi

doi:10.1021/acsami.9b02169

Cited by 30 publications

(20 citation statements)

References 47 publications

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“…In common, to obtain white light emission is possible (i) by mixing blue, green and red emissive components in solution state [16c] (ii) dispersing the emissive species in polymeric host matrices [16c] (iii) from toxic quantum dots [15a,16a,30] . But the suitability of these white light‐emitting materials have numerous limitations [15b,16a,26] . The generation of white light emission from a solid‐state of CDs materials is rare because of the aggregation cost of quenching of luminescence.…”

Section: Resultsmentioning

confidence: 99%

Carbon Dot−NaCl Crystals for White‐Light Generation and Fabry‐Perot Lasing

Prakash

Sahu

Bhattacharya

et al. 2021

Chemistry An Asian Journal

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Phosphor materials with broad spectral range and an average emission lifetime (20 μs) have been achieved from carbon dots (CDs)À NaCl crystals. A one-pot synthesis pathway has been developed for CDsÀ NaCl crystals formation at room temperature. Precursor for CDs materials was screened at room temperature by oxidation methodology from different simple sugar molecules. CDs (size less than 10 nm) prepared from the fructose sugar exhibit most intense emission. Utilizing ripe banana peel (contains~27% of fructose) as a precursor for the carbon dot formation, whitelight emission with a CIE index of (0.29, 0.34) has been achieved from the single source with CDsÀ NaCl crystals upon excitation at 430 nm. The crystals also function as Fabry-Perot (FÀ P) mode resonator for lasing, with a laser threshold value of 0.9 mW and a resonating Q-factor of 207. These results outline a new approach for realizing FÀ P lasing and white light emission from a non-toxic green source with a quick, facile and low-cost synthesis procedure.

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Section: Resultsmentioning

confidence: 99%

Carbon Dot−NaCl Crystals for White‐Light Generation and Fabry‐Perot Lasing

Prakash

Sahu

Bhattacharya

et al. 2021

Chemistry An Asian Journal

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“…On the other hand, the direct mixing of MEH/PCM solutions with matrix polymers would alter the final composition and, as a result, their emission switching properties. For all this, we then structured the MEH/PCM mixtures into solid lipid microparticles (SLMs) that can be easily dispersed within inert polymer films, following a similar approach already used in our group with core-shell microcapsules, [10,[87][88][89] liquid nanodroplets, [90] and solid lipid nanoparticles [91] to preserve the optical properties of macroscopic solutions in solid composites.…”

Section: Microstructuration and Integration Into Free-standing Films ...mentioning

confidence: 99%

“…Thermoresponsive optical materials are increasingly gaining interest in applications such as optical thermometers, diagnostic tools, optoelectronic devices, and anticounterfeiting markers, among others. [1][2][3][4][5][6][7][8][9][10][11][12][13] Specially relevant are those whose emission can be controlled with temperature, as luminescence transition is a quite universal method to control the aggregation of the embedded fluorophores and their luminescence (e.g., by switching between monomeric and excimer emission upon dye aggregation). [59][60][61][62][63][64][65][66][67][68] Following this approach, up to now organic nonpolymeric PCMs have been successfully combined with small molecular fluorophores to yield single-color emission switching (off/on or on/off), [59,61,65] while multicolored thermal responses, with coarse color tunability, could only be accomplished by using different fluorescent molecules.…”

Section: Introductionmentioning

confidence: 99%

“…Thermoresponsive optical materials are increasingly gaining interest in applications such as optical thermometers, diagnostic tools, optoelectronic devices, and anticounterfeiting markers, among others. [ 1–13 ] Specially relevant are those whose emission can be controlled with temperature, as luminescence can be detected remotely with highly sensitive and fast responsive techniques and offers time and spatial resolution at the macro‐ (e.g., luminescent labels) and nanoscale (e.g., fluorescence microscopy). Inherent thermofluorochromic materials involve thermoresponsive molecular dyes, [ 14–20 ] quantum dots, and lanthanide‐doped nanoparticles, [ 21 ] conjugated polymers, [ 22 ] or polymorphic dyes.…”

Section: Introductionmentioning

confidence: 99%

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Tunable Thermofluorochromic Sensors Based on Conjugated Polymers

Bellacanzone

Otaegui

Hernando

et al. 2022

Advanced Optical Materials

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Even though thermofluorochromic materials are eternal candidates for their use in multiple applications, they are still limited as they require complex synthetic strategies to accomplish tunable optical properties and/or provide optical changes only over a very wide temperature range. By taking advantage of the high sensitivity of the optical properties of conjugated polymers and oligomers to the external environment, herein phase change material (PCM)‐based thermofluorochromic mixtures are created, where the solid‐to‐liquid transition of the PCM host triggers a sharp fluorescence color change of the dispersed polymers/oligomers. Fluorophore conjugation length, concentration, and PCM nature can be used to vary the spectral properties of the resulting materials along the visible region, covering a large part of the CIE 1931 color space. For the preparation of functional devices, this behavior can be directly transferred to the solid state by soaking or printing cellulose papers with the obtained thermofluorochromic mixtures as well as by structuring them into solid lipid particles that can be dispersed within polymer matrices. The resulting materials show very promising features as thermal sensors and anticounterfeiting labels.

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“…The temperature of the surrounding environment of a fluorescent probe affects the molecular conformations, and hence alters the emissive properties . Chi and co‐workers developed an organic WLE material based on carbazolyl‐ and phenothiazinyl‐substituted benzophenone (Figure a) .…”

Section: Temperature‐induced White Light Emissionmentioning

confidence: 99%

Molecular Engineering Approaches Towards All‐Organic White Light Emitting Materials

Kundu

Pallavi

et al. 2020

Chemistry A European J

102

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White light emitting (WLE) materials are of increasing interesto wing to their promising applicationsi na rtificial lighting, display devices, molecular sensors, and switches.I n this context,o rganic WLE materials cater to the interesto f the scientific community owing to their promising features like color purity,l ong-term stability,s olutionp rocessability, cost-effectiveness,a nd low toxicity.T he typical methodf or the generation of white light is to combine three primary (red, green, and blue) or the two complementary (e.g., yellow and blue or red and cyan) emissive units covering the whole visible spectralw indow (400-800 nm). The judicious choice of molecular buildingb locks and connecting them through either strong covalentb onds or assembling through weakn oncovalent interactions are the key to achieve enhanced emissions panning the entire visible region.In the present review article, moleculare ngineering approaches for the development of all-organic WLE materials are analyzed in view of different photophysical processes like fluorescencer esonance energy transfer (FRET), excitedstate intramolecular protont ransfer (ESIPT), charget ransfer (CT), monomer-excimer emission, triplet-state harvesting, etc. The key aspect of tuning the molecular fluorescence under the influence of pH, heat, and host-guest interactions is also discussed. The white light emission obtained from small organic molecules to supramolecular assemblies is presented,i ncluding polymers, micelles,a nd also employing covalent organic frameworks. The state-of-the-art knowledge in the field of organic WLE materials, challenges, and future scope are delineated.

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Color-Tunable White-Light-Emitting Materials Based on Liquid-Filled Capsules and Thermally Responsive Dyes

Cited by 30 publications

References 47 publications

Carbon Dot−NaCl Crystals for White‐Light Generation and Fabry‐Perot Lasing

Carbon Dot−NaCl Crystals for White‐Light Generation and Fabry‐Perot Lasing

Tunable Thermofluorochromic Sensors Based on Conjugated Polymers

Molecular Engineering Approaches Towards All‐Organic White Light Emitting Materials

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