scholarly journals Luminescence characteristics of rare-earth-doped barium hexafluorogermanate BaGeF6 nanowires: fast subnanosecond decay time and high sensitivity in H2O2 detection

RSC Advances ◽  
2018 ◽  
Vol 8 (69) ◽  
pp. 39296-39306 ◽  
Author(s):  
Gibin George ◽  
Machael D. Simpson ◽  
Bhoj R. Gautam ◽  
Dong Fang ◽  
Jinfang Peng ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Decay Time ◽  
High Sensitivity ◽  
H2o2 Detection ◽  
Highly Sensitive ◽  
Inorganic Scintillators ◽  
Luminescence Characteristics ◽  
Rare Earth Doped

The decay time of BaGeF6 nanowires codoped with rare earths is found in the order of subnanoseconds, being one of the shortest decay time records from inorganic scintillators. Their luminescence emissions are highly sensitive for H2O2 detection.

scholarly journals Rare Earth Doped Silica Optical Fibre Sensors for Dosimetry in Medical and Technical Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
N. Chiodini ◽  
A. Vedda ◽  
I. Veronese
Keyword(s):  
Radiation Therapy ◽  
Rare Earth ◽  
Optical Fibre ◽  
Rare Earths ◽  
High Energy ◽  
Silica Matrix ◽  
Optical Fibres ◽  
General Description ◽  
Optical Fibre Sensors ◽  
Rare Earth Doped

Radioluminescence optical fibre sensors are gaining importance since these devices are promising in several applications like high energy physics, particle tracking, real-time monitoring of radiation beams, and radioactive waste. Silica optical fibres play an important role thanks to their high radiation hardness. Moreover, rare earths may be incorporated to optimise the scintillation properties (emission spectrum, decay time) according to the particular application. This makes doped silica optical fibres a very versatile tool for the detection of ionizing radiation in many contexts. Among the fields of application of optical fibre sensors, radiation therapy represents a driving force for the research and development of new devices. In this review the recent progresses in the development of rare earth doped silica fibres for dosimetry in the medical field are described. After a general description of advantages and challenges for the use of optical fibre based dosimeter during radiation therapy treatment and diagnostic irradiations, the features of the incorporation of rare earths in the silica matrix in order to prepare radioluminescent optical fibre sensors are presented and discussed. In the last part of this paper, recent results obtained by using cerium, europium, and ytterbium doped silica optical fibres in radiation therapy applications are reviewed.

Luminescence Properties of Rare-Earth Doped α-SiAlONs

2006 ◽  
Vol 317-318 ◽  
pp. 797-802
Author(s):  
Rong Jun Xie ◽  
Mamoru Mitomo ◽  
Naoto Hirosaki
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Room Temperature ◽  
Luminescence Properties ◽  
Activator Concentration ◽  
Photoluminescence Properties ◽  
Host Crystal ◽  
Emission Properties ◽  
White Leds ◽  
Rare Earth Doped

Rare-earth doped Ca-α-SiAlON phosphors, with the compositions of (Ca1-3/2xREx)m/2Si12-m-nAlm+nOnN16-n (RE = Ce, Sm, Eu, Tb, Yb and Dy, 0.5 ≤ m = 2n ≤ 3.0), were prepared by reaction at 1700oC for 2h under 10 atm N2. The concentration of rare earths varied from 3 to 30 at% with respect to Ca. The photoluminescence properties of the powders were investigated at room temperature. The results show that (i) strong visible emissions are observed in rare-earth doped Ca-α-SiAlONs; (ii) the emission properties can be optimized by tailoring the activator concentration and the composition of the α-SiAlON host crystal; and (iii) the yellow Eu2+-doped Ca-α-SiAlON phosphors can be used in warm white LEDs.

The Investigations on Luminescence Characteristics and Influence of Doping and Co-Doping Different Rare Earth Ions in White Phosphorescence Materials Having Different Luminescent Centers

2014 ◽  
Vol 90 ◽  
pp. 133-140
Author(s):  
Erkul Karacaoglu ◽  
Bekir Karasu ◽  
Esra Öztürk
Keyword(s):  
Particle Size ◽  
Rare Earth ◽  
Solid State ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Rare Earths ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
Luminescence Characteristics

The Akermanite type alkaline earth silicate Ca2MgSi2O7 activated by different types of rare earths was prepared by the conventional solid state reaction method under weak reductive atmosphere. The phase formation, particle size distribution, particle morphologies and photoluminescence properties of the samples have been investigated respectively. The comparative results of SEM and laser particle size analysis revealed that the relatively regular morphology, smaller particle size distribution could be achieved for the phosphors synthesized by the solid state reaction method including dry-ground after which powders were sieved below 170 meshes. The effects of rare earth oxides; Nd2O3, Pr6O11, Ce2O3 and Sm2O3 on the luminescence properties of the host material, Ca2MgSi2O7, were studied. Remarkable enhancement and novel color emitting including white in luminescence characteristics of host material were observed as a result of doping the mentioned rare-earths were doped.

Fast luminescence from rare-earth-codoped BaSiF6 nanowires with high aspect ratios

2018 ◽  
Vol 6 (27) ◽  
pp. 7285-7294 ◽  
Author(s):  
Gibin George ◽  
Shanell L. Jackson ◽  
Zariana R. Mobley ◽  
Bhoj R. Gautam ◽  
Dong Fang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Decay Time ◽  
Aspect Ratios ◽  
Rare Earth Doped

Solvothermally synthesized rare-earth-doped superlong BaSiF6 nanowires with high aspect ratios with subnanosecond decay time.

High Sensitivity Optical Fiber Temperature Sensor Based on Rare-Earth-Doped Double-Fiber Peanut

2020 ◽  
Vol 47 (1) ◽  
pp. 0110001
Author(s):  
陈彧芳 Chen Yufang ◽  
万洪丹 Wan Hongdan ◽  
陈乾 Chen Qian ◽  
周权 Zhou Quan ◽  
张祖兴 Zhang Zuxing
Keyword(s):  
Rare Earth ◽  
Optical Fiber ◽  
Temperature Sensor ◽  
High Sensitivity ◽  
Rare Earth Doped

scholarly journals A novel reversible fluorescent probe for the highly sensitive detection of nitro and peroxide organic explosives using electrospun BaWO4 nanofibers

2019 ◽  
Vol 7 (47) ◽  
pp. 14949-14961 ◽  
Author(s):  
Gibin George ◽  
Caressia S. Edwards ◽  
Jacob I. Hayes ◽  
Lei Yu ◽  
Sivasankara Rao Ede ◽  
...  
Keyword(s):  
Rare Earth ◽  
Fluorescent Probe ◽  
Sensitive Detection ◽  
Highly Sensitive ◽  
Highly Sensitive Detection ◽  
Rare Earth Doped

Electrospun rare-earth-doped BaWO4 nanofibers as a reversible fluorescent probe for the highly sensitive detection of nitro and peroxide organic explosives. The luminescence of the nanofibers is retained completely as fresh nanofibers upon heating.

Electrical Transport Properties of Rare Earth Doped Pentatellurides

2001 ◽  
Vol 691 ◽  
Author(s):  
Nathan D. Lowhorn ◽  
Terry M. Tritt ◽  
R. T. Littleton ◽  
Edward E. Abbott ◽  
J. W. Kolis
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Electrical Transport ◽  
Low Temperatures ◽  
Room Temperature ◽  
Peak Temperature ◽  
Electrical Transport Properties ◽  
Zero Crossing ◽  
Highly Sensitive ◽  
Rare Earth Doped

ABSTRACTThe transition metal pentatellurides HfTe5 and ZrTe5 exhibit a broad resistive anomaly as a function of temperature. This behavior is also reflected in the thermopower as it changes from a large positive value below room temperature to a large negative value at lower temperatures with the zero crossing corresponding well with the peak temperature of the resistive anomaly. The large values of the thermopower at low temperatures (T ≈ 150 K) have made these materials attractive for investigation for potential low temperature thermoelectric applications. The magnitude of the resistive peak and the peak temperature are highly sensitive to doping as well as external influences such as magnetic field and pressure. In this study we examine the effect of doping with various rare earth elements (RE = Ce, Sm and Dy) and the subsequent effects on the electrical resistivity and the thermopower. These results will be discussed in relation to the thermoelectric performance of these materials.

High-sensitivity detection of gold labels by high-angle dark-field STEM imaging

1990 ◽  
Vol 48 (3) ◽  
pp. 892-893 ◽  
Author(s):  
Max T. Otten
Keyword(s):  
High Sensitivity ◽  
Dark Field ◽  
Bright Field ◽  
Backscattered Electron Imaging ◽  
Backscattered Electrons ◽  
Average Atomic Number ◽  
Highly Sensitive ◽  
Backscattered Electron ◽  
Electron Imaging ◽  
High Sensitivity Detection

Labelling of antibodies with small gold probes is a highly sensitive technique for detecting specific molecules in biological tissue. Larger gold probes are usually well visible in TEM or STEM Bright-Field images of unstained specimens. In stained specimens, however, the contrast of the stain is frequently the same as that of the gold labels, making it virtually impossible to identify the labels, especially when smaller gold labels are used to increase the sensitivity of the immunolabelling technique. TEM or STEM Dark-Field images fare no better (Figs. 1a and 2a), again because of the absence of a clear contrast difference between gold labels and stain.Potentially much more useful is backscattered-electron imaging, since this will show differences in average atomic number which are sufficiently large between the metallic gold and the stains normally used. However, for the thin specimens and at high accelerating voltages of the STEM, the yield of backscattered electrons is very small, resulting in a very weak signal. Consequently, the backscattered-electron signal is often too noisy for detecting small labels, even for large spot sizes.

Waveguide amplifiers in rare-earth doped glasses : fabrication, characterisation [MATH] modelling

1994 ◽  
Vol 04 (C4) ◽  
pp. C4-277-C4-280 ◽  
Author(s):  
B. HYDE ◽  
D. BARBIER ◽  
J. HUBNER ◽  
J.-M. JOUANNO ◽  
A. KEVORKIAN ◽  
...  
Keyword(s):  
Rare Earth ◽  
Waveguide Amplifiers ◽  
Doped Glasses ◽  
Rare Earth Doped
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