Annealing time dependent up-conversion luminescence enhancement in magnesium–tellurite glass

2013 ◽  
Vol 136 ◽  
pp. 145-149 ◽  
Author(s):  
Raja J. Amjad ◽  
M.R. Sahar ◽  
S.K. Ghoshal ◽  
M.R. Dousti ◽  
S. Riaz ◽  
...  
Keyword(s):  
Annealing Time ◽  
Tellurite Glass ◽  
Time Dependent ◽  
Luminescence Enhancement

Annealing time dependent 1.53µm fluorescence enhancement in Er3+-doped tellurite glasses containing silver NPs

2014 ◽  
Vol 125 ◽  
pp. 56-58 ◽  
Author(s):  
Yawei Qi ◽  
Yaxun Zhou ◽  
Libo Wu ◽  
Fengjing Yang ◽  
Shengxi Peng ◽  
...  
Keyword(s):  
Annealing Time ◽  
Fluorescence Enhancement ◽  
Time Dependent ◽  
Tellurite Glasses ◽  
Silver Nps

scholarly journals Development of new Fe–Al–Nb(–B) alloys for structural applications at high temperatures

MRS Advances ◽  
2021 ◽  
Author(s):  
Angelika Gedsun ◽  
Frank Stein ◽  
Martin Palm
Keyword(s):  
Microstructural Evolution ◽  
Annealing Time ◽  
Composition Range ◽  
Boron Doping ◽  
Laves Phase ◽  
Time Dependent ◽  
Homogeneous Distribution ◽  
Heusler Phase ◽  
Structural Applications ◽  
The Matrix

Abstract It is known for Fe–Al–Ta alloys, that a homogeneous distribution of strengthening Laves phase precipitates in the matrix and aligned at the grain boundaries can be obtained when the formation of the stable Laves phase is preceded by the formation of the metastable Heusler phase. Several Fe–Al–Nb alloys with different Al and Nb contents and with or without boron doping are studied to elucidate whether comparable microstructures can be obtained in this system. It was found that the Heusler phase only occurs within a limited composition range. The time-dependent evolution of the microstructure shows that the transformation proceeds faster in Fe–Al–Nb alloys. Microhardness was measured in dependence on the microstructural evolution with increasing annealing time, and compressive yield stress was determined for alloys annealed 700 °C/1000 h to evaluate the influence of microstructure and composition. Graphic Abstract

scholarly journals Morphology Manipulation and Upconversion Luminescence Enhancement of β-NaLuF4: Er3+ Hexagonal Microtubes via Sr2+ Doping

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Han Lin ◽  
Zhonggen Wang ◽  
Yan Hong
Keyword(s):  
Reaction Time ◽  
Upconversion Luminescence ◽  
Time Dependent ◽  
Doping Content ◽  
Luminescence Enhancement ◽  
Ion Doping ◽  
Crystal Field Symmetry ◽  
Total Fluorescence ◽  
Field Symmetry ◽  
Red Luminescence

A new and facile strategy to enhance the upconversion luminescence (UCL) emission of NaLuF4: Er3+ microcrystals (MCs) using strontium (Sr) as a dopant has been reported. With the introduction of Sr2+, the products change from long NaLuF4: Er3+ hexagonal microtubes to short hexagonal microtubes and finally to hexagonal microprisms. The growth mechanism is profoundly discussed according to the different reaction time-dependent morphologies. More importantly, the total fluorescence intensity is significantly reinforced by doping Sr2+ ions. When 18% Sr2+ is doped into NaLuF4: Er3+ hexagonal microtubes, the maximum green and red luminescence intensities are about 5.8 and 4.4 times higher than those of Sr2+-free samples, respectively. The influences of Sr2+ ion doping content on the phase, the morphology, and the local crystal field symmetry of the as-synthesized NaLuF4 crystals are investigated.

Impact of Annealing Time on the Optical Response of Zinc-Boro-Tellurite Glass

2017 ◽  
Vol 268 ◽  
pp. 3-7
Author(s):  
Zahra Ashur Mahraz ◽  
Md Rahim Sahar ◽  
Sib Krishna Ghoshal
Keyword(s):  
Annealing Time ◽  
Tellurite Glass ◽  
Photonic Devices ◽  
Growth Surface ◽  
Growth Reduction ◽  
Limited Growth ◽  
Ag Nps ◽  
Diffusion Limited ◽  
Local Field Effect ◽  
Glass Compositions

Annealing time dependent optical properties of melt-quench synthesized Er3+-doped (0.5 mol%) zinc-boro-tellurite (ZBT) glasses containing silver (Ag) nanoparticles (NPs) (1.0 mol%) are reported. Heat treatment (HT) durations are varied to control NPs growth. Reduction of NPs sizes from 12.7 to 6.6 nm for HT time beyond 6 hr at 410 °C is ascribed to their diffusion limited growth. Surface plasmon resonance bands evidenced at 550 and 580 nm are red shifted. Luminescence intensity enhancement is majorly attributed to the local field effect of Ag NPs and quenching is due to the energy transfer from NPs to Er3+. Present glass compositions are promising for the development of photonic devices.

Luminescence Enhancement of Samarium-Doped Tellurite Glass Containing Silver Nanoparticles

2014 ◽  
Vol 895 ◽  
pp. 260-264 ◽  
Author(s):  
Nur Alia Fauzia Abdullah ◽  
Md Rahim Sahar ◽  
Khaidzir Hamzah ◽  
Sib Krishna Ghoshal
Keyword(s):  
Silver Nanoparticles ◽  
Localized Surface Plasmon Resonance ◽  
Tellurite Glass ◽  
Luminescent Properties ◽  
Localized Surface Plasmon ◽  
Melt Quenching ◽  
Luminescence Enhancement ◽  
Glass Substrates ◽  
Sodium Tellurite ◽  
Nanoparticles Concentration

Samarium-doped tellurite glass embedded with silver nanoparticles are synthesized by melt quenching technique and optically characterized. The effect of silver nanoparticles on the luminescent properties of the samarium-doped sodium tellurite glass is investigated. Upon pumping with 406 nm radiation, it is found that there are four distinctive emission bands centered at 562 nm, 599 nm, 645 nm and 705 nm. In the presence of silver nanoparticles in the glass substrates, we observe significant enhancement in the intensity of these emission bands. The enhancement tends to increase with the increasing of silver nanoparticles concentration. The mechanism of luminescence enhancement is discussed in terms of localized surface plasmon resonance.

TEM studies of tweed microstructures in annealed amelia albite

1990 ◽  
Vol 48 (4) ◽  
pp. 1064-1065
Author(s):  
Y. J. Kim ◽  
D. M. Henderson
Keyword(s):  
Annealing Time ◽  
The Other ◽  
Frequency Of Occurrence ◽  
Systematic Trend ◽  
Tweed Structure

Natural Amelia albite (Ab99.3An0.1Or0.6) annealed at 1073° and 924°C for various periods up to 140 days has been studied by NMR. TEM studies of the same sample revealed a distinct tweed microstructure in some samples annealed at both 1073°C and 924°C. On the whole, the quasi-regular tweed has a periodicity of 100 - 200 Å in both directions, one nearly normal to b* and the other approximately parallel to b*, which gives rise to two-directional streaking in SADP’s (Fig. 1 and 2). However, there are some differences in the tweed structure developed on annealing at 1073°C and at 924°C in albite.Albite samples annealed at 1073° show a systematic trend in their development of tweed structures: the regularity, periodicity, and frequency of occurrence increase with annealing time during the first 3 days, and then decrease gradually until no tweed microstructures are seen in samples annealed for more than 15 days. The tweed structure proceeds locally to form one-directional twin-like microstructures.

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