Near infrared emitting quantum dots: synthesis, luminescence properties and applications

Ma, Yue; Zhang, Yu; Yu, William W.

doi:10.1039/c9tc04065j

Cited by 84 publications

(39 citation statements)

References 198 publications

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“…The development of organic light-emitting molecules is recognized as one of the most important studies because of the broad application of these compounds as fluorescence probes, bio-imaging materials, and biosensors in biomedical diagnostics [1][2][3][4] and as organic light-emitting diodes in the technological field [5][6][7][8]. Among the organic light-emitting molecules de- veloped thus far, extended π-conjugated compounds (e.g., pyrenes and perylenes) emit fluorescence, which is a radiative deactivation process from the lowest singlet (S 1 ) excited state to the ground (S 0 ) state [9].…”

Section: Introductionmentioning

confidence: 99%

Development of fluorinated benzils and bisbenzils as room-temperature phosphorescent molecules

Yamada

Higashida

Wang

et al. 2020

Beilstein J. Org. Chem.

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Pure organic phosphorescent molecules are attractive alternatives to transition-metal-complex-based phosphores for biomedical and technological applications owing to their abundance and nontoxicity. This article discloses the design, synthesis, and photophysical properties of fluorinated benzil and bisbenzil derivatives as potential pure organic room-temperature phosphorescent molecules. These compounds were separately converted from the corresponding fluorinated bistolanes via PdCl2-catalyzed oxidation by dimethyl sulfoxide, while nonfluorinated bistolane provided the corresponding bisbenzil derivatives exclusively in a similar manner. Intensive investigations of the photophysical properties of the benzil and bisbenzil derivatives in toluene at 25 °C showed both fluorescence with a photoluminescence (PL) band at a maximum wavelength (λPL) of around 400 nm and phosphorescence with a PL band at a λPL of around 560 nm. Interestingly, intersystem crossing effectively caused fluorinated benzils to emit phosphorescence, which may arise from immediate spin-orbit coupling involving the 1(n, π)→3(π, π) transition, unlike the case of fluorinated or nonfluorinated bisbenzil analogues. These findings offer a useful guide for developing novel pure organic room-temperature phosphorescent materials.

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Section: Introductionmentioning

confidence: 99%

Development of fluorinated benzils and bisbenzils as room-temperature phosphorescent molecules

Yamada

Higashida

Wang

et al. 2020

Beilstein J. Org. Chem.

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“…Emerging heavy metal-free QDs such as SiQDs can also be an ideal alternative to commercially available cytotoxic CdTe and CdSe QDs (Keshavarz et al, 2018). QDs have been used to develop a variety of fluorescence, chemiluminescence and bioluminescence sensors due to their unique optical properties such as enhanced brightness, resistance to photobleaching, large absorption coefficient, narrow emission spectrum and sizetunable light emission (Liang et al, 2014b;Ma et al, 2019). In this section, we will focus on the application of QDs in biosensing in recent years.…”

Section: Quantum Dotsmentioning

confidence: 99%

“…In general, we have introduced various biosensing applications of QDs in this part, which greatly improves the comprehension of QDs as potential biomaterials for biosensing applications (Wegner and Hildebrandt, 2015;Ma et al, 2019). QDs have a good affinity for biomolecules and their chemical and optical properties enable their use as optical sensors to detect various biomolecules (Yao et al, 2018).…”

Section: Quantum Dotsmentioning

confidence: 99%

Application of Zero-Dimensional Nanomaterials in Biosensing

et al. 2020

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Zero-dimensional (0D) nanomaterials, including graphene quantum dots (GQDs), carbon quantum dots (CQDs), fullerenes, inorganic quantum dots (QDs), magnetic nanoparticles (MNPs), noble metal nanoparticles, upconversion nanoparticles (UCNPs) and polymer dots (Pdots), have attracted extensive research interest in the field of biosensing in recent years. Benefiting from the ultra-small size, quantum confinement effect, excellent physical and chemical properties and good biocompatibility, 0D nanomaterials have shown great potential in ion detection, biomolecular recognition, disease diagnosis and pathogen detection. Here we first introduce the structures and properties of different 0D nanomaterials. On this basis, recent progress and application examples of 0D nanomaterials in the field of biosensing are discussed. In the last part, we summarize the research status of 0D nanomaterials in the field of biosensing and anticipate the development prospects and future challenges in this field.

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“…The emitting dyes are the driving force for light concentration in LSCs cells. There are three main kinds of fluorophores: quantum dots [15][16][17][18], lanthanide-based materials [19][20] and organic dyes. Respect to the two first classes of compounds, organic dyes are usually less toxic and their optical properties (Stokes shift, quantum yield, thermal-and photo-stability) can be optimized by modifying the structure of organic molecules.…”

Section: Introductionmentioning

confidence: 99%

Photophysical properties of new p-phenylene- and benzodithiophene-based fluorophores for luminescent solar concentrators (LSCs)

et al. 2020

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In this study, we report on the synthesis of new organic fluorophores containing either the pphenylene or the benzodithiophene cyclic nucleus connected to thiophene units via triple bonds and carbonyl group, and on their application for the fabrication of luminescent solar concentrators (LSCs). Their optical properties were evaluated. Independent of the core, dyes containing the COthiophene residues seem to be the most promising for LSCs applications. In fact, carbonyl groups only slightly lower quantum yield but significantly increase the red-shift so that the superimposition between the absorbance spectrum and the emission one is diminished. In the case of the benzodithiophene centre, light emission in the yellow-red portion of the spectrum is achieved. The latter dye is then selected for tests in a poly(methyl methacrylate) (PMMA) matrix. It showed good compatibility and homogenous distribution, no auto-absorption phenomena, and optical efficiencies of about 8% at 1 wt. %, i.e. comparable with those PMMA/Lumogen Red films in the same range of concentration.

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Near infrared emitting quantum dots: synthesis, luminescence properties and applications

Abstract: Near-infrared QDs and their applications.

Cited by 84 publications

References 198 publications

Development of fluorinated benzils and bisbenzils as room-temperature phosphorescent molecules

Development of fluorinated benzils and bisbenzils as room-temperature phosphorescent molecules

Application of Zero-Dimensional Nanomaterials in Biosensing

Photophysical properties of new p-phenylene- and benzodithiophene-based fluorophores for luminescent solar concentrators (LSCs)

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