Crystallization and luminescence of Pr3+-doped CdS QDs silicate glass

2018 ◽  
Vol 13 (05) ◽  
pp. 1850064
Author(s):  
Peijing Tian ◽  
Zhe Zhang ◽  
Jian Yuan ◽  
Weihong Zheng ◽  
Hong Li ◽  
...  
Keyword(s):  
Silicate Glass ◽  
Fluorescence Spectra ◽  
Crystallization Behavior ◽  
Emission Spectra ◽  
Treatment Temperature ◽  
Absorption And Fluorescence Spectra ◽  
Fluorescence Measurements ◽  
Cds Qds ◽  
Quenching Method ◽  
Considerable Enhancement

CdS QDs (quantum dots) were precipitated in the Pr3+-doped silicate glass by the melting-quenching method. The crystallization behavior and luminescent property of the Pr3+-doped CdS QDs silicate glass were analyzed by XRD, Raman, TEM, UV–Vis–NIR scanning spectrophotometer and fluorescence spectra. It was found that with the increase in the heat-treatment temperature, the size of CdS particles increased from 2.30[Formula: see text]nm to 3.63[Formula: see text]nm, while red-shift was observed in absorption and fluorescence spectra excited at 370[Formula: see text]nm. Fluorescence measurements of the glass showed that the growth of CdS QDs induced a considerable enhancement in the emission spectra of Pr3+, and the sensitization is due to the energy transfer from CdS QDs to Pr3+ ions.

The Synthesis and Electroluminescence Properties of 4-Benzofuranyl-1,8-Naphthalimide Derivatives

2012 ◽  
Vol 557-559 ◽  
pp. 1031-1036 ◽  
Author(s):  
Jian Xin Yang ◽  
Xiang Hui Wang
Keyword(s):  
Absorption Spectra ◽  
Fluorescence Spectra ◽  
Cycloaddition Reaction ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Quantum Yields ◽  
Absorption And Fluorescence Spectra ◽  
Maximum Brightness ◽  
Maximum Emission ◽  
Mild Conditions

A series of fluorescence compounds, 4-benzofuranyl-1,8-naphthalimides, were prepared through cycloaddition reaction from 4-ethynyl-1,8-naphthalimides and o-iodophenols which catalyzed by a Pd(PPh3)2Cl2 / CuI system under mild conditions. The intermediate material, 4-ethynyl-1,8- naphthalimide, was synthesized from 4-bromo-1,8- naphthalimide and trimethylsilyl- acetylene. The absorption and fluorescence spectra of 4-benzofuranyl-1,8- naphthalimides were studied and the quantum yields were measured. The maximum UV/vis absorption spectra were in the range of 375-400 nm and the maximum emission spectra were in the range of 470-510 nm. The electro- luminescent properties were also mensurated through a doped electroluminescent device which contains 1% 1,8-naphthalimides and 99% CBP (4,4'-N,N'-dicarbazole-biphenyl), It’s shown the maximum brightness reached 3700 cd/ m2 at 22.5V.

Phase Separation and Luminescence of Eu2O3 Doped Boron Silicate Glass

2012 ◽  
Vol 509 ◽  
pp. 303-307 ◽  
Author(s):  
Pei Jing Tian ◽  
Jin Shu Cheng ◽  
Gao Ke Zhang ◽  
Qin Yang
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Phase Separation ◽  
Silicate Glass ◽  
Heat Treatment Temperature ◽  
Fluorescence Spectra ◽  
Treatment Temperature ◽  
Separation Region ◽  
Luminescent Intensity ◽  
The Eu

Eu2O3 doped boron silicate glass appearing phase separation have been prepared and characterized. The heat treatment temperature was determined by DTA, the microstructure and optical properties of the glass were studied by SEM and fluorescence spectra. The adding of Eu2O3 restrained the phase separation and crystallization of the glass. Eu ions exist in the glass samples as the Eu3+ ions, rather than the Eu2+ ions. As the heat treatment temperature increases, the phase separation region increased gradually, and the luminescent intensity increases.

Synthesis, Spectroscopic Properties of Bis-Boc-L-Alanine Modified 1,8-Naphthyridine Ligand Induced by Hg2+

2015 ◽  
Vol 1089 ◽  
pp. 121-124
Author(s):  
Gao Zhang Gou ◽  
Bo Zhou ◽  
Ling Shi ◽  
Xian Lan Chen ◽  
Na Wu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Mirror Symmetry ◽  
Heavy Metal Ions ◽  
Fluorescence Spectra ◽  
Electronic Absorption Spectra ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Ion Source ◽  
Absorption And Fluorescence Spectra ◽  
Comprehensive Study

One Bis-Boc-L-alanine-1,8-naphthyridine ligand containing amino acid by amido bond named 2,7-Bis-Boc-L-alanine-1,8-naphthyridine (L1) was synthesized and characterized. And there absorption and fluorescence spectra in methanol is presented. It exhibits electronic absorption spectra with λmax at about 340 nm, which can be tentatively assigned to π→π* transition. The emission spectra of L1 in CH3OH shows a mirror symmetry peak with λmax at about 375 nm. Then, the comprehensive study of spectroscopic properties upon titration of L1 with heavy metal ions as ion source in CH3OH was investigated.

scholarly journals Study the fluorescent and conductivity properties of a 4-hydroxy-3-nitro-1,8-naphthalic anhydride

2021 ◽  
Vol 2063 (1) ◽  
pp. 012025
Author(s):  
Roza Al-Aqar
Keyword(s):  
Ionic Conductivity ◽  
Absorption Maximum ◽  
Fluorescence Spectra ◽  
Visible Region ◽  
Emission Spectra ◽  
Solvent Polarity ◽  
Disulfonic Acid ◽  
Absorption And Fluorescence Spectra ◽  
Naphthalic Anhydride ◽  
Fluorescence Maximum

Abstract The compound of (4-hydroxy-3-nitro-1,8-naphthalic anhydride) and the dopant material (4-hydroxy-m-benzene-disulfonic acid) were synthesized. The UV-Vis absorption and fluorescence spectra of the compound were recorded. The bathochromic shifts in absorption due to the changes in the solvent polarity was observed, in DMSO solvent, the compound shows different peaks, three bands in the UV region and one band in the visible region, one absorption peak at 402 nm, which might be attributed to the (ICT) band. The emission spectra of this compound were sensitive to the solvent polarity. They moved to lower energies with increasing the polarity of the solvent. The influence of the solvent polarity on the fluorescence maximum was more pronounced compared with the absorption maximum, showing ca. 3 nm red shift on moving from butanol to DMSO. The effect of the dopant material on the conductivities (ionic and specific) of the compound was studied, the ionic conductivity was increased as the weight of the dopant material increases, and the ionic conductivity (G) was measured in water as a solvent. the (G) of the compound was 2.4X10-6 Siemens at 0.01 gm of the dopant material, and was 2.62X10-4 Siemens after the dopant material was added (0.1 gm).

Proton-Induced Multiple Changes of the Absorption and Fluorescence Spectra of Amino-Aza-Oligo(Phenylenevinylene)s

2008 ◽  
Vol 55 ◽  
pp. 36-41 ◽  
Author(s):  
Volker Schmitt ◽  
Stefan Glang ◽  
Jasmin Preis ◽  
Heiner Detert
Keyword(s):  
Fluorescence Spectra ◽  
Fluorescent Dyes ◽  
Aldol Condensation ◽  
Emission Spectra ◽  
Solvent Polarity ◽  
High Sensitivity ◽  
Optical Spectra ◽  
Absorption And Fluorescence Spectra ◽  
Absorption And Emission ◽  
Absorption And Emission Spectra

Fluorescent dyes with a high sensitivity of their optical spectra towards changes of the environment were prepared via aldol condensation or Horner olefinations. The main chromophore is a quadrupolar N-substituted 1,4-distyrylbenzene which allows protonation and complexation at various positions resulting in a series of different and significant changes of the optical spectra. The sensitivity of the absorption and emission spectra on solvent polarity, acid, and cations is reported.

scholarly journals Synthesis, Properties of a New (Polymer and Chalcone)

2019 ◽  
pp. 1-9
Author(s):  
Mohana Faroug Attia
Keyword(s):  
Spontaneous Emission ◽  
Fluorescence Spectra ◽  
Emission Spectra ◽  
Amplified Spontaneous Emission ◽  
Absorption And Fluorescence Spectra ◽  
Synthesis Properties ◽  
Ft Ir ◽  
Pulse Energies ◽  
Conventional Laser ◽  
Methyl Phenyl

This paper included two objectives: (i) Synthesis of Polymer {poly 2- [1- phenyl -3-(4-methyl phenyl)-4, 5-dihydropyrazole-5-yl-(4-phenoxy carbonyl)] styrene} PMDPCS and structure characterized by FT-IR, 1H-NMR spectra and Uv/Vis and XRD. (ii) Synthesis of chalcone {3-(4-(dimethylamino) phenyl)-2-phenyl-(2E) propen-1-one} (DAPPP) for absorption and fluorescence spectra under different solvents and concentrations.  Also, under various concentrations, organic solvents and pump pulse energies of Nd: YAG laser, the amplified spontaneous emission (ASE) was studied. Additionally, under the same identical conditions, the amplified spontaneous emission spectra of DAPPP in solution were compared with a conventional laser dye of coumarin 503. Finally, the gain and the fluorescence quantum yield of DAPPP were determined.

scholarly journals Calculation of vibrationally resolved absorption and fluorescence spectra of the rylenes

2020 ◽  
Vol 22 (4) ◽  
pp. 2379-2385 ◽  
Author(s):  
Jonas Greiner ◽  
Dage Sundholm
Keyword(s):  
Excellent Agreement ◽  
Generating Function ◽  
Function Method ◽  
Fluorescence Spectra ◽  
Emission Spectra ◽  
Absorption And Fluorescence Spectra ◽  
Absorption And Emission ◽  
Absorption And Emission Spectra

A generating function method was used to simulate the vibrationally resolved absorption and emission spectra of perylene, terrylene and quaterrylene. The calculated spectra are found to be in excellent agreement with the experimental ones.

Substituted Derivatives of 10-Phenyl-9-Acetoxyanthracene. Absorption and emission spectra, quantum yield and lifetime of fluorescence

1975 ◽  
Vol 30 (5) ◽  
pp. 612-618 ◽  
Author(s):  
Janina Heidt ◽  
Józef Heidt ◽  
Janina Gronowska
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Fluorescence Spectra ◽  
Emission Spectra ◽  
Oscillator Strengths ◽  
Steric Effects ◽  
Absorption And Fluorescence Spectra ◽  
Mean Lifetime ◽  
The Mean ◽  
Derivatives Of

Abstract Absorption The absorption and fluorescence spectra of five substituted derivatives of 10-phenyl-9-acetoxy-anthracene were measured and the oscillator strengths of the 1A→1La1A→1Bb and 1A→1Cb electronic vibration bands were determined. Comparison of the absorption spectra of these compounds to the unsubstituted molecule (anthracene) indicate the presence of bathochromic and steric effects. The fluorescence quantum yield and the mean lifetime of the fluorescence were also measured.

scholarly journals Оптические свойства нанокластеров серебра, синтезированных в поверхностно-привитой полиакриловой кислоте при разных плотностях прививки

2019 ◽  
Vol 126 (2) ◽  
pp. 220
Author(s):  
А.А. Горбачев ◽  
Н.И. Сушко ◽  
П.П. Першукевич ◽  
О.Н. Третинников
Keyword(s):  
Polyacrylic Acid ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Substrate Surface ◽  
Emission Spectra ◽  
Silver Nanoclusters ◽  
Plastic Substrate ◽  
Absorption And Fluorescence Spectra ◽  
Grafting Density ◽  
Polymer Template

AbstractFluorescent silver nanoclusters immobilized on a plastic substrate are obtained by photoinduced template synthesis using polyacrylic acid chemically grafted to the substrate surface as a template. The electronic absorption and fluorescence spectra of nanoclusters are studied depending on the polyacrylic acid grafting density. It is found that the optical absorption and fluorescence intensities of nanoclusters monotonically increase with increasing grafting density. The position and shape of the absorption and emission spectra almost do not change. The higher the polymer template grafting density, the higher the fluorescence stability of samples during storage at room temperature.

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