Construction of multi-layered white emitting organic nanoparticles by clicking polymers

Keita, H.; Güzeltürk, Burak; Pennakalathil, Jousheed; Erdem, Talha; Demir, Hilmi Volkan; Tuncel, Dönüş

doi:10.1039/c5tc01445j

Cited by 8 publications

(10 citation statements)

References 35 publications

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“…Conjugated polymers have emerged as an important class of materials and thus, found applications in the fabrication of various optoelectronic devices . Their potential for high efficiency makes them attractive for light‐emitting devices while the ability to tune their photophysical features by chemical modifications increases their flexibility.…”

Section: Introductionmentioning

confidence: 99%

“…Conjugated polymers have emerged as an important class of materials and thus, found applications in the fabrication of various optoelectronic devices. [1][2][3][4][5][6][7][8][9] Their potential for high efficiency makes them attractive for light-emitting devices while the ability to tune their photophysical features by chemical modifications increases their flexibility. In addition to these, the conjugated oligomer nanoparticles, which are essentially wrapped in the form of nanoscale balls of oligomers in sucrose crystals.…”

Section: Introductionmentioning

confidence: 99%

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Highly Luminescent CB[7]‐Based Conjugated Polyrotaxanes Embedded into Crystalline Matrices

Erdem

Idris

Demir

et al. 2017

Macro Materials & Eng

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they pose significantly lower risks to environment and health compared to other optical materials such as cadmiumbased quantum dots [10] and lead-based perovskites. [11] Despite the potential of conjugated polymers, a decrease in the fluorescence quantum yield (QY) and a low emission stability in their solid state turn out to be an important bottleneck. These problems mainly arise from the changes in the polymer morphology upon film casting, which affects the inter and intrachain interactions. To decrease these interactions and consequently, achieve higher QYs in solid films, various approaches have been adopted including the utilization of nonradiative energy transfer to light-emitting polymers [12,13] and the incorporation of the polymers into inorganic nanoparticles. [14][15][16] Alternatively, chemical entities such as dendrones have been attached to the polymer backbone in order to weaken the π-π stacking.[17] Insulation of the conjugated polymer backbones via rotaxanation, which can be considered as threading the polymer chain using a macrocyclic ring, also steps forward as a promising solution. [18][19][20] In the literature, cyclodextrins and cucurbit[n]urils (CB[n]) have been shown to successfully isolate the polymer backbone leading to enhanced fluorescence QY. [21][22][23][24][25][26] For instance, our group has recently demonstrated fourfold increase in the fluorescence QY of poly(9,9′-bis(6″-(N,N,N-trimethylammonium)hexyl)fluorene-alt-co-thiophenelene) accompanied by blue-shifted fluorescence spectrum and prolonged fluorescence lifetime after threading with CB7. [27] Despite the improvements in the QY of polyrotaxane solutions, their solid films still suffered from decreased fluorescence QY. Therefore, a solution to maintain the fluorescence QY is of significant importance for their use in solid-state lighting.A possible solution to this problem might come from the research on the colloidal quantum dots, which similarly suffered from decreasing QYs in their solid films. Otto et al. [28] showed that the quantum dots in water can be successfully incorporated into crystalline salt matrices. Later, this approach was shown to improve the fluorescence QY, [29] and emission stability. [30,31] Moreover, this method was also extended to nonionic crystals including sucrose [32] and anthracene [33] and to quantum dots in nonpolar solvents [30,34] and applied in lightemitting diodes (LEDs) [31] and sensors. [35] Recently, our group has evaluated the potential of this technique by incorporating π-Conjugated Polyrotaaxanes π-Conjugated polymers suffer from low quantum yields (QYs) due to chainchain interactions. Furthermore, their emission in solid films is significantly quenched due to aggregation leading further decrease in QY. These are the two main issues of these materials hampering their widespread use in optoelectronic devices. To address these issues, here the backbone of poly(9,9′-bis (6″-(N,N,N-trimethylammonium)hexyl)fluorene-alt-co-thiophenelene) is isolated by threading with cucurbit[7]uril (CB7). Su...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Luminescent CB[7]‐Based Conjugated Polyrotaxanes Embedded into Crystalline Matrices

Erdem

Idris

Demir

et al. 2017

Macro Materials & Eng

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“…As observed in color CCD images and LCM PL spectra, the crystalline DA NPs exhibited bright and sharp 7 light emission compared to the amorphous DA NPs. In the corresponding LCM PL spectra, the FWHM of the crystalline DA NPs was significantly narrowed and blue-shifted.…”

Section: Discussionmentioning

confidence: 74%

“…For example, practically, organic NPs are being used as developing materials such as display element [7], ink toners [8], drugs [9], and so on. As a part of these organic nanomaterials, organic crystals, whose optical and electrical properties are fundamentally different from those of inorganic metals and semiconductors due to weak intermolecular interaction forces of the van der Waals type [10] have captured more and more interest.…”

Section: Introductionmentioning

confidence: 99%

Sharp and bright photoluminescence emission of single-crystalline diacetylene nanoparticles

Kim

Park

et al. 2016

Journal of the Korean Physical Society

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Amorphous nanoparticles (NPs) of diacetylene (DA) molecules were prepared by using a reprecipitation method. After crystallization through solvent-vapor annealing process, the highly crystalline DA NPs show different structural and optical characteristics compared with the amorphous DA NPs. The single crystal structure of DA NPs was confirmed by high-resolution transmission electron microscopy (HR-TEM) and wide angle X-ray scattering (WAXS). The luminescence color and photoluminescence (PL) characteristics of the DA NPs were measured using color charge-coupled device (CCD) images and high-resolution laser confocal microscope (LCM). The crystalline DA NPs emit bright green light emission compared with amorphous DA NPs and the main PL peak of the crystalline DA NPs exhibits relative narrow and blue shift phenomena due to enhanced interaction between DA molecular in the nano-size crystal structure.

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“…White emitting nanomaterials are of current interest for use in organic light emitting diodes, pollution monitoring, and detection of ions . Sensors based on white emitting particles are expected to be more sensitive to analytes because white light is composed of three color components in specific intensity ratios, and any change in one color intensity can produce detectable, off‐white emission.…”

Section: Introductionmentioning

confidence: 99%

White-Emitting Protein Nanoparticles for Cell-Entry and pH Sensing

Stromer

Kumar

2016

Adv. Funct. Mater.

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Facile synthesis of white‐emitting, protein‐based, metal‐free, stable, nontoxic, and pH sensitive, advanced functional nanoparticles (GlowDots), as alternatives to quantum dots, is reported here. Controlled cross‐linking of bovine serum albumin resulted in facile formation of spherical nanoparticles of 35 nm in diameter with a sharp size distribution (±10 nm), which were then conjugated with specific dyes to produce white‐emitting particles with tunable excitation wavelengths. Chemical novelty is that the particle size, size distribution, stability, surface chemistry, and emission properties are under full chemical control where the size and absorption/emission properties are independently tuned. Up to 100 dye molecules were attached to each particle, on an average, and hence, particles acquired strong absorption cross‐sections as well as high brightness. White fluorescence of GlowDots is strongly sensitive to pH over a range of pH 2–11, and pH‐induced emission changes are fully reversible. The particles readily entered HeLa cells and emission color depended on particle location in the live cells, which is most likely due to the local environment surrounding the particles. These are the very first reports of white‐emitting advanced functional nanoparticles that are biodegradable, sensitive to pH, and amenable for live cell imaging to probe the subcellular compartments.

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Construction of multi-layered white emitting organic nanoparticles by clicking polymers

Cited by 8 publications

References 35 publications

Highly Luminescent CB[7]‐Based Conjugated Polyrotaxanes Embedded into Crystalline Matrices

Highly Luminescent CB[7]‐Based Conjugated Polyrotaxanes Embedded into Crystalline Matrices

Sharp and bright photoluminescence emission of single-crystalline diacetylene nanoparticles

White-Emitting Protein Nanoparticles for Cell-Entry and pH Sensing

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