Y 2 O 3 -doped Eu3+ (Y2O3:Eu) nanometer particles (NPs) were synthesized via a chemical route. The particle size estimated by x-ray diffractometry and transmission electron microscopy was about 61 nm. Two photoluminescence peaks observed at 582 587 nm, being attributed to the transition of D05→F1a7 in S6 C2 symmetry sites Y2O3, respectively. intensity ratio nm larger for NPs than micrometer (MPs). excitation peak due charge-transfer band shifted toward high-energy side as compared with that...

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...

The authors produced the transparent color conversion thick film which is composed of a high concentration YAG:Ce3+ nanoparticles prepared by glycothermal method, and characterized its optical properties. transmittance 200μm with nanoparticle content 70.7wt% was 82% at 525nm corresponding to emission peak YAG:Ce3+. intensity photoluminescence due 5d→4f transition Ce3+ in doubled placing reflection mirror back film. Judging from this result, has markedly low scattering loss.

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

Y3Al 5O12:Ce3+ (YAG:Ce3+) nanocrystals were synthesized in 1,4-butylene glycol (BG) with and without poly(ethylene glycol) (PEG) by the glycothermal method. The internal quantum efficiency of photoluminescence (PL) corresponding to 5d → 4f transition Ce3+ YAG:Ce3+ nanocrystal increased from 21.3 37.9% addition PEG, while no appreciable change primary particle size, crystallite lattice distortion was recognized transmission electron microscopy X-ray diffractometry....

The photoluminescence intensity at 580 nm for 2--3 ZnS doped with ${\mathrm{Mn}}^{2+}$ (ZnS:Mn) increases after modification by acrylic acid (AA). electronic states are examined electron paramagnetic resonance (EPR) spectroscopy. Signal I $g=2.0024$ and hyperfine coupling constant $|A|=6.9\mathrm{mT}$ signal II $g=2.0013$ $|A|=9.0\mathrm{mT}$ observed in the EPR spectrum of unmodified ZnS:Mn. is assigned to isolated ions substitutionally incorporated cubic ZnS. relative decreasing S/Zn...

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....

Single‐phase perovskite 0.9Pb(Mg 1/3 Nb 2/3 )O 3 ‐0.1PbTiO (0.9PMN–0.1 PT) from a stoichiometric mixture of starting materials was synthesized by applying mechanochemical technique to the stage precursor. A PbO, TiO 2 , Mg(OH) and O 5 milled for 60 min heated at temperatures as low 850°C 4 h obtain single phase. The maximum dielectric constant samples increased sintering temperature increased, with remarkable grain growth, attained 24600 1200°C. In contrast, poor densification coexistence...

Calcium phosphate synthesized by a wet-mechanochemical reaction between Ca(OH)2 and H3PO4 is identified X-ray diffractometry as an apparently single phase of hydroxyapatite (HAp). We examined more detail on the local structure product high-resolution 1H 31P solid-state double nuclear magnetic resonance (NMR) spectroscopy. Adsorbed structural waters, well two kinds OH groups in HAp, were observed inversion recovery magic angle spinning (MAS) spectra. HAp other calcium 1H→31P cross...

Zn2GeO4:Mn2+ nanophosphors are synthesized from germanium(IV) oxide and acetates of zinc manganese(II) in a mixed solvent water diethylene glycol (DEG) by the solvothermal reaction at 200 °C for 2 h. Phase pure is obtained samples prepared 0 ≤ xDEG 91.7, where volume percentage DEG solvent. The particle crystallite sizes decrease with increase xDEG. sample = 91.7 comprises nanorods 30.2 12.2 nm mean length width, respectively. actual Mn concentration measured X-ray fluorescence analysis...

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,...

Yttrium–aluminum garnet nanophosphor powder is prepared from yttrium acetate, cerium and aluminum isopropoxide by a one-step glycothermal method, i.e., autoclave treatment in 1,4-butanediol at for 2 h. The gradual decrease the intensity of photoluminescence corresponding to transition observed under continuous irradiation blue excitation light. This photobleaching behavior not micrometer-sized bulk. Two-step synthesis, repeated treatment, causes growth nanoparticles improvement...