Fluorescent carbon dots (CDs) are of interest as a promising alternative to quantum dots, partly because they do not include heavy metals. However, most CDs exhibit blue or green emission, while red-emitting required for variety applications. In the present work, were synthesized by refluxing three phenylenediamine (PD) isomers with amino groups at different positions (o-PD, m-PD, and p-PD) in diphenyl ether 250 °C 4 h. Upon dispersing resulting eight solvents polarities, emission colors...

Surface modification of <italic>p</italic>-phenylenediamine-derived carbon dots with decanoic acid and perfluorodecanoic successfully modulated fluorescence solvatochromism.

CuInS2 (CIS) quantum dots (QDs) were investigated as a luminescent downshifting (LDS) material that converts near-ultraviolet (UV) light to visible and applied single crystalline silicon (c-Si) solar module has no spectral sensitivity in the near-UV region. The bandgap of CIS/ZnS core/shell QDs was successfully adjusted ∼3 eV, which adequate for LDS layer devices, by changing molar ratio Cu/In. CIS/ZnS/ZnS core/shell/shell with 59.9% absolute photoluminescence (PL) yield prepared...

Fluorescent carbon dots (CDs) represent a promising eco-friendly next-generation phosphor. However, most CDs exhibit broad photoluminescence (PL) spectra [full width at half-maximum (fwhm) over 60 nm]; few works on with sharp PL (fwhm less than 40 nm) have been reported. In addition, their syntheses and color tuning require harsh conditions of high temperatures, long reaction times, pressures catalysts. Here, we successfully prepared narrow-bandwidth emissive 27–40 from phloroglucinol in...

Surface modification of p-phenylenediamine-derived carbon dots using 4-morpholinoaniline with an electron-donating and rigid structure followed by purification silica gel column chromatography increased the photoluminescence quantum yield from 28.3 to 41.8% in chloroform. The improved was observed for surface postaddition modifier after formation π-conjugated dot core but not prepared a mixture p-phenylenediamine 4-morpholinoaniline. finding this work gives us idea design high application...

The power generation performance of luminescent solar concentrators (LSCs) is decreased by unignorable optical losses including self-absorption luminescence the phosphor and absorption light guide plate....

All-inorganic cesium lead halide perovskite CsPbX3 (X = Cl, Br, I) nanocrystals have emerged as promising luminescent quantum dots. In this review, we summarize recent work on their synthesis, properties, and stabilities. Through controlling the composition of alloyed halides size effects, band gaps emission wavelengths are readily tunable over entire visible range. Their sharp line-widths extend color gamut liquid crystal displays. They also exhibit high photoluminescence (PL) yields fast...

In order to enhance the photoelectric conversion efficiencies of crystalline silicon (c-Si) solar cells, CsPbCl3 quantum dots (QDs) codoped with Mn2+ and Er3+ (CsPbCl3:Mn2+, QDs) were mixed ethylene–(vinyl acetate) (EVA) form a film which was used as luminescent down-shifting (LDS) layer. The LDS layer effectively improved low utilization near-ultraviolet light c-Si cells. These CsPbCl3:Mn2+,Er3+ QDs synthesized via conventional high-temperature injection method. is luminescence center,...

YVO4:Bi3+,Eu3+ nanophosphor converts near ultraviolet light to red and shows lower scattering loss for visible long-term photostability. Therefore, the authors produce urethane resin films containing nanophosphors on soda-lime glass substrates as spectral shifters understand effects of doping Bi3+ Eu3+ into YVO4 concentration photoelectric conversion efficiencies a monocrystalline silicon photovoltaic module. Under infrared radiation, enhance efficiency module through down-shifting compared...

CuGaS 2 /ZnS quantum dots were investigated for a luminescent downshifting layer and solar concentrator with single-crystalline silicon module.

Environmentally friendly and visible fluorescent carbon dots (CDs) have received attention as alternatives to compound semiconductor quantum containing toxic elements. Hydrothermal reaction of water-soluble carbohydrates can provide an eco-friendly facile synthesis approach CDs. In this study, we attempted efficiently produce uniform CDs using a microwave heating system that maintain the solution at constant temperature. We synthesized from D-glucose through hydrothermal treatment 200°C for...

Photostable silica composites containing CuInS₂/ZnS/ZnS quantum dots were fabricated using a sol–gel method. Their photoluminescence yields 43–47%.

CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) have attracted much attention as promising materials for next-generation optoelectronic applications. However, improvement of their low stabilities against heating and humidity is needed practical use. In this work, we focused on perfluorodecanoic acid (PFDA) a surface ligand investigated the thermal chemical photoluminescence (PL) properties CsPbBr3 NCs. Oleic (OA) adsorbed NCs was exchanged decanoic (DA) PFDA. OA-modified DA-modified...

Low-toxic and efficient fluorescent core–shell CuInS2/ZnS (CIS/ZnS) quantum dots (QDs) are good candidates for optoelectronic device applications. They synthesized in a hydrophobic environment, while large amounts of organic solvents used the preparation films have significant problems on environmental load human health. CIS/ZnS QDs hydrophilized by adsorbing 3-mercaptopropionic acid their surfaces can be aqueous film fabrication process. In this work, electrophoretic deposition (EPD) with...

We fabricated nanocomposite films from an aqueous suspension of red-emitting YVO4:Bi(3+),Eu(3+) nanoparticles (hydrodynamic size: 22 ± 6 nm) and silicone-modified acrylic resin (60 15 by electrophoretic deposition under application a constant voltage. The were formed these negatively charged on ITO-coated glass substrates the anodic side at volume ratio nanophosphor:resin ∼ 40:60. According to transmission electron microscopy observations, are well-dispersed around nanoparticles. transparent...

We investigated the effects of annealing on photoluminescence (PL) properties a citrate-capped YVO4:Bi3+,Eu3+ nanophosphor. The 300 °C annealed nanophosphor exhibited highest PL intensity at 619.5 nm corresponding to an f–f transition Eu3+ under near-UV excitation. Fourier transform infrared spectroscopy indicated decrease in amounts adsorbed water and citrate surface with annealing. Dehydration increase absorption contributed improved intensity, since is luminescence quencher. thermal...

Cd-free fluorescent InP/ZnS quantum dots (QDs) have attracted attention for use as color converters of liquid crystal displays. To protect QDs from oxygen, which degrades them by photo-oxidation during excitation, we fabricated a transparent monolithic silica composite containing the using an aqueous solution tetramethylammonium silicate (TMAS) source. The TMAS was basic and readily dispersed negatively charged obtained ligand exchange 1-dodecanethiol 3-mercaptopropionic acid (MPA). A highly...

Self-readsorption of surface ligands completely restores the photoluminescence CsPbBr₃ quantum dots damaged by excitation light.

Compositions of green-emitting Y_1−x−yCe<italic>x</italic>Tb<italic>y</italic>BO₃ and red-emitting Y_{1−x−y−z}Ce<italic>x</italic>Tb<italic>y</italic>Eu<italic>z</italic>BO₃ were optimized by photoluminescence intensity each microplate-well using a microplate reader.

In this work, green-emitting InP/ZnS quantum dots (QDs) modified with 1-dodecanethiol were embedded into silica by two methods to improve their photostability while maintaining a high photoluminescence yield (PLQY) and color coordinate. A monolithic QD-silica composite prepared non-aqueous route tetraethyl orthosilicate lactic acid featured low transparency, loss of the purity green, PLQY 1.6%, which was considerably lower than that original QDs (67%). The decrease attributed QD aggregation...

We investigated the effects of addition oleic acid (OA) on stability CsPbBr3 quantum dot (QD) dispersions in toluene during storage and light irradiation. Excess amounts OA degraded th...

Photodegraded CsPbBr3 perovskite nanocrystals (NCs) can exhibit complete self-recovery following storage in the dark. This behavior results from readsorption of surface ligands that experienced photoinduced desorption under UV light excitation. In present work, mixed-halide CsPb(Cl0.4Br0.6)3, CsPb(Cl0.2Br0.8)3, and CsPb(Br0.7I0.3)3 NCs were prepared via ion exchange to evaluate influence halide composition on photodegradation NCs. Partially substituting Cl– for Br– enhanced photoactivation,...

Morphologies, photoluminescence properties, and photostability were characterized for Y₂O₃:Bi³⁺,Eu³⁺ fluorescent nanosheets prepared through calcining solvothermally synthesized layered yttrium hydroxide precursors.