Quantum yield of luminescence of Ag nanoclusters dispersed within transparent bulk glass vs. glass composition and temperature

2012 ◽  
Vol 101 (25) ◽  
pp. 251106 ◽  
Author(s):  
A. S. Kuznetsov ◽  
J. J. Velázquez ◽  
V. K. Tikhomirov ◽  
J. Mendez-Ramos ◽  
V. V. Moshchalkov
Keyword(s):  
Quantum Yield ◽  
Glass Composition ◽  
Bulk Glass ◽  
Quantum Yield Of Luminescence ◽  
Ag Nanoclusters

Concentration dependence of the quantum yield of luminescence of Tm3+ ions in gadolinium oxychloride

2004 ◽  
Vol 71 (6) ◽  
pp. 829-836
Author(s):  
T. M. Kozhan ◽  
V. V. Kuznetsova ◽  
P. P. Pershukevich ◽  
I. I. Sergeev ◽  
V. S. Khomenko ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Concentration Dependence ◽  
Quantum Yield Of Luminescence

scholarly journals Quantitative express estimation of humine and fulvo acids content in aqueous solutions by photo-stimulated luminescence

2018 ◽  
Keyword(s):  
Quantum Yield ◽  
Dynamic Range ◽  
Light Flux ◽  
Low Noise ◽  
Light Sources ◽  
Colloidal Systems ◽  
Colloidal Solutions ◽  
Measuring Device ◽  
Light Emitting ◽  
Quantum Yield Of Luminescence

The work substantiates the expediency of using the methods of recording the quantum yield of luminescence of humic and folic compounds in the process of determining the relative concentrations of these substances in aqueous and colloidal solutions. The efficiency of using modern high-power ultraviolet semiconductor light sources with high monochromaticity of light flux has been proved, followed by the registration of reviews of the samples under investigation with the help of a low-noise semiconductor photodetector with a connected operational amplifier, which allows to provide a wide dynamic range of current and voltage measurements. The subject of the study is the process of recording the quantitative and qualitative parameters of the se- lected chemical compounds in colloidal systems in the liquid phase developed in the course of research by the model of the measuring instrument. The novelty of the work is to improve the classical methods for recording the quantum yield of lumines- cence, using a modern element base and testing the model of a measuring device with powerful ultraviolet light-emitting diodes as a light source and low-noise photodetector with a clear dynamic range designed for recording the quantum yield of luminescence of the samples under investigation.

The Influence of Metal Diffusion and Interfacial Reactions on the Crystallization Behaviour of Glasses Employed in the Manufacture of Glass-Ceramic-to-Metal Seals

2008 ◽  
Vol 39-40 ◽  
pp. 369-374
Author(s):  
Ian W. Donald ◽  
Brian L. Metcalfe ◽  
Lee A. Gerrard
Keyword(s):  
Glass Composition ◽  
Glass Ceramics ◽  
Crystallization Behaviour ◽  
Metal Species ◽  
Effective Control ◽  
Interfacial Region ◽  
Bulk Glass ◽  
Factors Affecting ◽  
Metal Diffusion ◽  
Lifetime Behaviour

One of the major attributes of glass-ceramics is an ability to tailor their thermal expansion characteristics and this makes them ideal candidates for sealing to a wide variety of metals and alloys; however, during the sealing process, reaction of diffusing metal species with glass constituents may occur, and this can lead to the formation of undesirable phases within the interfacial region. In addition, diffusion of metal species into the bulk glass away from the interface may affect the overall crystallization kinetics and can result in the formation of unwanted crystalline phases which may be detrimental to the lifetime behaviour of a seal component. This contribution outlines and discusses the factors affecting the crystallization behaviour of glasses employed in seal manufacture and describe methods by which undesirable reactions can be alleviated or minimized through effective control of the process parameters and starting glass composition.

scholarly journals Compositional dependency on dissolution rate and cytocompatibility of phosphate-based glasses: Effect of B2O3 and Fe2O3 addition

2017 ◽  
Vol 8 ◽  
pp. 204173141774445 ◽  
Author(s):  
Nusrat Sharmin ◽  
Fu Gu ◽  
Ifty Ahmed ◽  
Andrew J Parsons
Keyword(s):  
Dissolution Rate ◽  
Glass Composition ◽  
Aqueous Media ◽  
Mg63 Cell ◽  
Unique Property ◽  
Bulk Glass ◽  
Culture Studies ◽  
Dissolution Properties ◽  
Crystallisation Temperature

The unique property of phosphate-based glasses and fibres to be completely dissolved in aqueous media is largely dependent on the glass composition. This article focuses on investigating the effect of replacing Na2O with 3 and 5 mol% Fe2O3 on cytocompatibility, thermal and dissolution properties of P2O5–CaO–Na2O–MgO–B2O3 glass system, where P2O5 content was fixed at 45 mol%. The effect of increasing Fe2O3 from 3 to 5 mol% on P2O5–CaO–Na2O–MgO glasses was also evaluated. The glass transition temperature, onset of crystallisation temperature and liquidus temperature were found to decrease with increasing Fe2O3 content and the addition of B2O3, while the thermal expansion values were found to decrease. The density of the glasses decreased with increasing Fe2O3 content. However, an increase in the density was observed by the addition of 5 mol% B2O3. The dissolution properties and mode of bulk glass and fibres were also examined which were found to decrease with increasing B2O3 and Fe2O3. However, it was found that the dissolution properties of the glasses containing both B2O3 and Fe2O3 were lower than only Fe2O3 containing glasses. The in vitro cell culture studies using human osteoblast like (MG63) cell lines revealed that the glasses containing both B2O3 and Fe2O3 maintained and showed higher cell viability as compared to the only Fe2O3 containing glasses. Glasses containing both B2O3 and Fe2O3 showed a pronounced effect on the dissolution rate of the glasses, which eventually improved the cytocompatibility properties of the glasses investigated.

scholarly journals Влияние полимерной матрицы на люминесцентные свойства композиций, допированных хелатами бора

2019 ◽  
Vol 127 (9) ◽  
pp. 425
Author(s):  
Е.В. Федоренко ◽  
А.А. Хребтов ◽  
А.Г. Мирочник ◽  
П.С. Нефедов ◽  
Л.А. Лим ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Polymethyl Methacrylate ◽  
Maximum Quantum Yield ◽  
Quantum Yield Of Luminescence ◽  
Phenyl Rings ◽  
Boron Difluoride

Polymer luminescent compositions based on polystyrene (PS), polycarbonate (PC) and polymethyl methacrylate (PMMA) doped with boron difluoride dibenzoylmethanate (DBMBF2), boron difluoride anthracenoylacetonate (AntAcBF2) and their mixture were investigated. Composition based on PS has a maximum quantum yield of luminescence. The role of PS in increasing the efficiency of energy transfer from the donor (DBMBF2) to the acceptor (AntAcBF2) is revealed, which is due to the formation of exciplexes between DBMBF2 and phenyl rings of PS.

scholarly journals A Comprehensive Strategy to Boost the Quantum Yield of Luminescence of Europium Complexes

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Nathalia B. D. Lima ◽  
Simone M. C. Gonçalves ◽  
Severino A. Júnior ◽  
Alfredo M. Simas
Keyword(s):  
Quantum Yield ◽  
Europium Complexes ◽  
Comprehensive Strategy ◽  
Quantum Yield Of Luminescence
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