Influence of Coumarin Dyes on the Laser Performance of Pyrromethene and Perylene Dyes Co-Doped into ORMOSILs

Laser dyes perylene red (p-red) or pyrromethene 567 (p567) were co-doped with coumarin 440 (C440) or coumarin 500 (C500) into MTES- and VTES-derived organically modified silicates (ORMOSILs) by sol-gel process. The effects of coumarin dye concentration on the laser performances of p-red and p567 were investigated. The results from laser efficiency measurements illustrated that at optimized coumarin concentration, the slope efficiency of co-doped p-red increased by a factor of 2 while that of co-doped p567 increased marginally. It was also found that by co-doping coumarin, the laser wavelength of p-red blue shifted and the laser thresholds for p567 and p-red could be reduced. The energy transfer mechanisms involved were also discussed.

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Organically Modified Silicates by the Sol-Gel Process

MRS Proceedings ◽

10.1557/proc-32-327 ◽

1984 ◽

Vol 32 ◽

Cited By ~ 87

Author(s):

H. Schmidt

Keyword(s):

Sol Gel ◽

New Materials ◽

Organic Components ◽

Organically Modified Silicates ◽

Sol Gel Process ◽

Inorganic As ◽

Organically Modified ◽

General Aspects

ABSTRACTThe introduction of organic groups into inorganic networks by the sol-gel process opens the possibility for the preparation of new materials, and typical properties resulting from inorganic as well as from organic components may be combined. Some general aspects and different examples of material developments are reviewed.

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Structure-Related Mechanical Properties of Ormosils by SOL-GEL Process

MRS Proceedings ◽

10.1557/proc-271-681 ◽

1992 ◽

Vol 271 ◽

Cited By ~ 19

Author(s):

Yi Hu ◽

John D. Mackenzie

Keyword(s):

Mechanical Properties ◽

Reaction Temperature ◽

Fracture Strength ◽

Modulus Of Elasticity ◽

Sol Gel ◽

Acid Catalyst ◽

Polydimethyl Siloxane ◽

Organically Modified Silicates ◽

Sol Gel Process ◽

Organically Modified

ABSTRACTThe mechanical properties corresponding to the different structures of organically modified silicates (Ormosils) prepared by the sol-gel process were studied. Tetraethoxysilane (TEOS) and polydimethyl siloxane (PDMS) were used as the inorganic and polymeric components, respectively. Large variations in the microstructure of the Ormosils were found by changing the reaction temperature, and the content of PDMS, acid catalyst (HCI),and water. The structure of the Ormosils and the mechanical properties were correlated by the edge connectivity. Modulus of elasticity and fracture strength were used to study their relations Ormosils structures.

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Chemistry And Applications Of Inorganic-Organic Polymers (Organically Modified Silicates)

MRS Proceedings ◽

10.1557/proc-73-739 ◽

1986 ◽

Vol 73 ◽

Cited By ~ 89

Author(s):

H. Schmidt ◽

B. Seiferling

Keyword(s):

Sol Gel ◽

Inorganic Materials ◽

Organic Polymers ◽

Polymeric Networks ◽

Organically Modified Silicates ◽

Sol Gel Process ◽

Organically Modified ◽

Polycondensation Process ◽

Application Potential ◽

Inorganic Organic Polymers

ABSTRACTThe combination of inorganic polymeric networks with organic components leads to inorganic-organic polymers. A convenient method for the introduction of organic radials into an inorganic backbone is the use of organosubstituted silico esters in a polycondensation process. This leads to≡Si-O-Si≡ network containing materials, so-called organically modified silicates (ORMOSILs). For the synthesis of the inorganic backbone, in opposition to the high temperature preparation of non-metallic inorganic materials like ceramics, “soft chemistry” methods have to be applied in order to preserve organic groupings to be incorporated. Therefore, the sol-gel process is a suitable technique [1–5]. A review over basic synthesis principles and chemical methods, their effect on special material properties and the application potential will be given.

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Synergistic Effect of Eu3+ and Sm3+ Co-Doping on Photocatalytic Activity of TiO2 Nanoparticles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.197-198.891 ◽

2011 ◽

Vol 197-198 ◽

pp. 891-894 ◽

Cited By ~ 1

Author(s):

Cheng Zhi Jiang ◽

Xu Dong Lu

Keyword(s):

Photocatalytic Activity ◽

Synergistic Effect ◽

Sol Gel ◽

Blue Shift ◽

Nano Particles ◽

Absorption Profile ◽

Co Doping ◽

The Matrix ◽

Co Doped ◽

The Eu

Pure TiO2, Eu3+and Sm3+co-doping TiO2composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2nano-particles increases after co-doping of Eu3+and Sm3+and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+and Sm3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+and Sm3+co-doped into TiO2nano-particles exert a synergistic effect on their photocatalytic activity.

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Effect of cobalt doping on microstructures and dielectric properties of ZnO

Canadian Journal of Chemistry ◽

10.1139/cjc-2018-0195 ◽

2019 ◽

Vol 97 (3) ◽

pp. 227-232 ◽

Cited By ~ 1

Author(s):

Ye Zhao ◽

Fan Tong ◽

Mao Hua Wang

Keyword(s):

Zno Nanoparticles ◽

Sol Gel ◽

Hexagonal Wurtzite Structure ◽

Sem Analysis ◽

Co Doping ◽

In Doping ◽

Zno Powders ◽

Doped Zno ◽

Zno Crystal ◽

Co Doped

Pure and cobalt-doped ZnO nanoparticles (2.5, 5, 7.5, and 10 atom % Co) are synthesized by sol–gel method. The as-synthesized nanoparticles are characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and field emission scanning electron microscopy (FE-SEM) analysis. The nanoparticles of 0, 2.5, and 5 atom % Co-doped ZnO exhibited hexagonal wurtzite structure and have no other phases. Moreover, the (101) diffraction peaks position of Co-doped ZnO shift toward a smaller value of diffraction angle compared with pure ZnO powders. The results confirm that Co ions were well incorporated into ZnO crystal lattice. Simultaneously, Co doping also inhibited the growth of particles, and the crystallite size decreased from 43.11 nm to 36.63 nm with the increase in doping concentration from 0 to 10 atom %. The values of the optical band gap of all Co-doped ZnO nanoparticles gradually decreased from 3.09 eV to 2.66 eV with increasing Co content. Particular, the dielectric constant of all Co-doped ZnO ceramics gradually increased from 1.62 × 103 to 20.52 × 103, and the dielectric loss decreased from 2.36 to 1.28 when Co content increased from 0 to 10 atom %.

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Synthesis and properties of Mo and W ions co-doped porous nano-structured VO2 films by sol–gel process

Journal of Sol-Gel Science and Technology ◽

10.1007/s10971-012-2881-9 ◽

2012 ◽

Vol 64 (2) ◽

pp. 493-499 ◽

Cited By ~ 29

Author(s):

Yuanjie Xu ◽

Wanxia Huang ◽

Qiwu Shi ◽

Yang Zhang ◽

Linwei Song ◽

...

Keyword(s):

Sol Gel ◽

Sol Gel Process ◽

Co Doped

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Novel sol–gel fabrication of Yb3+/Tm3+ co-doped β-NaYF4 thin films and investigation of their upconversion properties

Photochemical & Photobiological Sciences ◽

10.1039/c8pp00295a ◽

2018 ◽

Vol 17 (9) ◽

pp. 1239-1246 ◽

Cited By ~ 2

Author(s):

Anna L. Pellegrino ◽

Maria R. Catalano ◽

Paolo Cortelletti ◽

Giacomo Lucchini ◽

Adolfo Speghini ◽

...

Keyword(s):

Thin Films ◽

Sol Gel ◽

Sol Gel Process ◽

Co Doped

An innovative sol–gel process, using a mixture of Na(hfa)·tetraglyme and RE(hfa)3·diglyme (RE = Y, Yb, Tm) complexes, has been optimized to produce upconverting β-NaYF4:Yb3+/Tm3+ thin films.

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