scholarly journals The growth, structure and luminescence properties of ZnSe1-xSx materials

2018 ◽  
Vol 58 (3) ◽  
Author(s):  
Olha G. Trubaieva ◽  
Mykhailo A. Chaika ◽  
Alexander I. Lalayants
Keyword(s):  
Thermal Stability ◽  
Sulfur Content ◽  
Light Output ◽  
Luminescent Properties ◽  
Luminescence Properties ◽  
Bulk Crystals ◽  
Sphalerite Structure ◽  
Growth Structure ◽  
Wurtzite Lattice

ZnSe1-xSxcrystals with a higher content of selenium or sulfur ions adopt, respectively, a wurtzite or sphalerite structure. Luminescent properties of ZnSe1-xSxcrystals are determined by ternary VZnZniOSecomplexes for crystals with a cubic (sphalerite) lattice, and by sulfur vacancies VSfor crystals with a hexagonal (wurtzite) lattice. Light output of ZnSe1-xSxcrystals increases with increasing the sulfur content up tox= 0.3 and reaches the value of light output observed for ‘classic scintillator’ ZnSe(Te). At the same time, the ZnSe1-xSxbulk crystals possess better thermal stability at the same energy of emitted photons (hν~ 2 eV) as compared to that of the ZnSe(Te) crystals.

scholarly journals Effect of sulfur on the scintillation properties of mixed ZnSxSe1–x crystals

2018 ◽  
pp. 36-42
Author(s):  
O. G. Trubaieva ◽  
M. A. Chaika ◽  
O. V. Zelenskaya ◽  
A. I. Lalayants ◽  
S. N. Galkin
Keyword(s):  
Directional Solidification ◽  
Sulfur Content ◽  
Light Output ◽  
Luminescent Properties ◽  
High Energy ◽  
Luminescence Spectra ◽  
Bulk Crystals ◽  
X Ray ◽  
Basic Properties ◽  
Better Than

ZnSxSe1–x based luminescent materials are promising for use as X-ray and g-ray detectors. The main advantage of ZnSxSe1–x crystals is the possibility of making of solid solutions over an entire X-range. It was found that varying the composition of ZnSxSe1–x crystals can change their luminescent properties. Many studies were focused on obtaining ZnSxSe1–x mixed crystals, most using a vapour phase growth methods, and only some of works used the directional solidification. The directional solidification techniques allow growing large ZnSxSe1–x crystals for high-energy particles detectors. Practical use, however, requires the knowledge about luminescent properties of ZnSxSe1–x bulk crystals. This study reports the effect of sulfur content on basic properties of ZnSxSe1–xx bulk crystals grown by Bridgman-Stockbarger method. Six different compounds were studied: ZnS0.07Se0.93, ZnS0.15Se0.85, ZnS0.22Se0.78, ZnS0.28Se0.72, ZnS0.32Se0.68, ZnS0.39Se0.61. The ZnSe(Al) and ZnSe(Te) crystals grown at the similar conditions were used as reference. X-ray luminescence was studied using РЕИС-И (REIS-I) X-ray source (Cu, U = 10—45 kV). КСВУ-23 (KSVU-23) spectrophotometer was used to analyse the emission spectra. The afterglow level h(%) was determined by Smiths Heimann AMS-1 spectrophotometer at excitation by such X-ray and g-ray sources as 123Cs and 241Am (59.5 keV). Light output is one of the main characteristics of the scintillator, which determines its quality as a detector. The ZnSxSe1-x crystals demonstrated increase in the intensity of X-ray induced luminescence spectra with increasing of sulfur content and reached maximum for ZnS0.22Se0.78 composition. Light output of ZnSxSe1–x bulk crystals are higher than those of ZnSe(Te) and ZnSe(Al) commercial crystals. Moreover, thermal stability of scintillation light output of ZnSxSe1–x bulk crystals are also better than those. This investigation has revealed that basic properties of ZnSxSe1–x based scintillation detectors are better than those of ZnSe(Te) and ZnSe(Al).

Effect of Y3+ on the local structure and luminescent properties of La3−xYxSi6N11:Ce3+ phosphors for high power LED lighting

RSC Advances ◽  
2016 ◽  
Vol 6 (80) ◽  
pp. 77059-77065 ◽  
Author(s):  
Fu Du ◽  
Weidong Zhuang ◽  
Ronghui Liu ◽  
Yuanhong Liu ◽  
Jiyou Zhong ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
High Power ◽  
Local Structure ◽  
Luminescent Properties ◽  
Luminescence Properties ◽  
Led Lighting ◽  
Good Thermal Stability ◽  
Phase Pure ◽  
High Power Led

A series of phase pure nitride yellow phosphors La3−xYxSi6N11:Ce3+ with good thermal stability and tunable luminescence properties have been synthesized and the crystal structure was investigated in detail.

scholarly journals Thermal Stability and Luminescent Properties of Tri-cellulose Acetate Composites Containing Dy(SSA)3Phen Complex

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Xiangwei Sun ◽  
Feiyue Wu ◽  
Yan Luo ◽  
Mengjun Huang ◽  
Yuntao Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Cellulose Acetate ◽  
Ternary Complex ◽  
Fluorescence Spectra ◽  
Luminescent Properties ◽  
Rare Earth Complex ◽  
Luminescent Materials ◽  
Sulfosalicylic Acid ◽  
Composition And Structure ◽  
Fluorescent Materials

Dysprosium (Dy) ternary complex was prepared using 5-sulfosalicylic acid (SSA) as the first ligand and 1,10-phenanthroline (Phen) as the second ligand, denoted as Dy(SSA)3Phen. The complex was blended with tri-cellulose acetate (TCA) via a cosolvent method to obtain polymer luminescent materials. The composition and structure of the rare-earth complex were characterized by means of elemental analysis, infrared (IR) spectra, and thermogravimetric analysis (TGA). The fluorescence spectra displayed this pure Dy(SSA)3Phen complex, and the TCA/Dy(SSA)3Phen composites all emit blue light. The (90/10) composite possesses fine luminescent properties with quantum yield of 33.5% and thermal stability for potential usage as blue fluorescent materials.

Improved Luminescence Properties and Thermal Stability of ZnS Quantum Dots by Organic and Inorganic Passivation

2002 ◽  
Vol 19 (7) ◽  
pp. 967-969 ◽  
Author(s):  
El-Khair Hatim Mohamed ◽  
Xu Ling ◽  
Chen Kun-Ji ◽  
Ma Yi ◽  
Zhang Yu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Quantum Dots ◽  
Luminescence Properties ◽  
Thermal Stability Of
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