scholarly journals Spectral characteristics of initial and irradiated GaAsP LEDs

2021 ◽  
Vol 22 (2) ◽  
pp. 143-148
Author(s):  
R.M. Vernydub ◽  
◽  
O.I. Kyrylenko ◽  
O.V. Konoreva ◽  
D.P. Stratilat ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solid Solution ◽  
Band Gap ◽  
Spectral Characteristics ◽  
Charge Carriers ◽  
Optical Characteristics ◽  
Operational Parameter ◽  
Thermal Stability Of

The optical characteristics of the GaAs1-хPх output LEDs and LEDs irradiated with electrons with Е = 2 MeV, Ф = 1015 ÷ 1016 cm-2 were studied. The width of the band gap of the GaAs1-хPх (х = 0.45) solid solution was estimated. Its growth is caused by the heating of carriers by the field of the p-n junction. The damage coefficients of the lifetime of minority charge carriers for irradiated GaAsP LEDs have been calculated and the consequences of exposure to radiation on the operational parameter Т1, which determines the thermal stability of the diodes, have been analyzed.

Achieving high thermal stability of different rare-earth ions in a single matrix host via the manipulation of the local structure by a solid solution

2020 ◽  
Vol 22 (28) ◽  
pp. 16294-16300
Author(s):  
Xiuxia Yang ◽  
Lei Zhao ◽  
Zhichao Liu ◽  
Shuyu Tian ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solid Solution ◽  
Rare Earth ◽  
Local Structure ◽  
Local Environment ◽  
High Thermal Stability ◽  
Rare Earth Ions ◽  
Single Matrix ◽  
Thermal Stability Of

Manipulating the local environment of CAS by substitution of Al3+–Y3+ for Si4+–Ca2+ to achieve more stability in the structure of CYA.

Thermal Decomposition of Supersaturated Ti1-xAlxN Solid Solution Synthesized by High-Energy Milling

2016 ◽  
Vol 9 ◽  
pp. 82-89
Author(s):  
Maya Radune ◽  
Michael Zinigrad ◽  
David Fuks ◽  
S. Hayun ◽  
Nachum Frage
Keyword(s):  
Thermal Stability ◽  
Solid Solution ◽  
Spinodal Decomposition ◽  
Density Functional ◽  
Chemical Deposition ◽  
High Energy ◽  
Nucleation And Growth ◽  
Scanning Calorimetry ◽  
Wide Range ◽  
Thermal Stability Of

Supersaturated titanium-aluminum nitride (Ti1-xAlxN) is a very attractive material for a wide range of applications due to its high oxidation and wear resistance accompanied by high strength, hardness, thermal conductivity and thermal shock resistance. Currently, its applications are limited to coatings obtained by physical or chemical deposition. Bulk materials based on Ti1-xAlxN may be fabricated by powder metallurgy approach using powders synthesized by high-energy ball milling (HEBM), which composition corresponds to supersaturated Ti1-xAlxN solid solution. In the present study, thermal stability of the supersaturated Ti1-xAlxN solid solution was investigated. According to the quasi-binary TiN-AlN phase diagram, constructed using density functional theory (DFT) analysis, the concentration ranges, where decomposition takes place through spinodal decomposition or through nucleation and growth, were determined. Experimental study on thermal stability of solid Ti1-xAlxN solution powder was conducted by means of differential scanning calorimetry (DSC), Brunauer-Emmited-Teller (BET) and XRD. The results indicated that spinodal decomposition of Ti1-xAlxN starts at 800°C, while at temperature higher than 1300°C regular decomposition (nucleation and growth) is occur.

Point Defects in Relaxed Si1-xGex Alloy Layers

1998 ◽  
Vol 510 ◽  
Author(s):  
A. Mesli ◽  
A. Nylandsted Larsen
Keyword(s):  
Thermal Stability ◽  
Point Defect ◽  
Band Gap ◽  
Charge State ◽  
Point Defects ◽  
Buffer Layers ◽  
Threading Dislocations ◽  
Band Gap Engineering ◽  
The Impact ◽  
Thermal Stability Of

AbstractThe use of compositionally graded buffer layers in the growth of fully relaxed epitaxial Si1−xGex alloy layers has led to a major improvement in crystalline quality. A considerable reduction in the density of the threading dislocations has become possible, facilitating point defect studies in these materials. The issues addressed in this review are inherent to the coupling between band gap engineering and defect-related levels. Among them, the pinning behaviour, charge state effects and their consequence upon the thermal stability of point defects are discussed together with the impact of the fluctuation in Ge distribution

Effect of solid solution of thermal stability of zircon

1970 ◽  
Vol 5 (11) ◽  
pp. 965-972 ◽  
Author(s):  
S.S. Ramakrishnan ◽  
E.C. Subbarao ◽  
K.V.G.K. Gokhale
Keyword(s):  
Thermal Stability ◽  
Solid Solution ◽  
Thermal Stability Of

Modified optical properties via induced cation disorder in self-activated NaMg2V3O10

2018 ◽  
Vol 47 (12) ◽  
pp. 4368-4376 ◽  
Author(s):  
Longqing Mi ◽  
Yanlin Huang ◽  
Lei Cao ◽  
Yongyi Feng ◽  
Hyo Jin Seo
Keyword(s):  
Thermal Stability ◽  
Optical Properties ◽  
Band Gap ◽  
Structural Disorder ◽  
Cation Substitution ◽  
Cation Disorder ◽  
Cation Substitutions ◽  
Thermal Stability Of

Cation substitutions of (Mo6+ → V5+) and (Na+ → Mg2+) in NaMg2V3O10 induce structural disorder and narrow the band gap. The introduction of cation substitution improved emission and prolonged the lifetime. The thermal stability of phosphors was consolidated by the cation substitution. Cation disorder could be an effective approach to improve the luminescence nature in self-activated phosphors.

Effect of Unsymmetrically Branched Alkyl Chains on the Electrochemical Band Gap and Thermal Stability of the PCDTBT

2019 ◽  
Vol 4 (3) ◽  
pp. 936-940 ◽  
Author(s):  
Shu Er Tan ◽  
Farah Hannan Anuar ◽  
Sarkar ◽  
Rahman ◽  
Mohd Sani Sarjadi
Keyword(s):  
Thermal Stability ◽  
Band Gap ◽  
Alkyl Chains ◽  
Thermal Stability Of
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