Distribution of tellurium in melt-grown ZnSe(Te) crystals

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).

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“…[1][2][3][4][5]. Одíàêî ñ ðàзâèòèåм òåõíîëî-ãèé óжåñòîчàюòñÿ òðåбîâàíèÿ, ïðåдъÿâëÿåмыå ê òàêèм мàòåðèàëàм.…”

Section: влияние соäержания серы на сцинòилляционные свойсòва смешаннunclassified

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

et al. 2018

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“…In an effort to overcome the limitations of the above-mentioned conventional materials, compounds belonging to the II-VI semiconductor group have been proposed and investigated. These compounds are comprised of a group II metal (e.g., zinc-Zn, cadmium-Cd, mercury-Hg) with a group VI cation (e.g., sulfur-S, selenium-Se, tellurium-Te) and characterized by a series of properties that render them suitable for use in medical imaging applications [14,15], namely good light output, rapid decay times, radiation and thermal stability, mechanical strength, and non-hygroscopicity [8]. A wide band-gap representative of these semiconductors, zinc selenide activated with tellurium (ZnSe: Te), has attracted the attention of several scientific teams, including ours, with the "first to obtain it" being Ryzhikov et al [16].…”

Section: Introductionmentioning

confidence: 99%

On the Optical Response of Tellurium Activated Zinc Selenide ZnSe:Te Single Crystal

et al. 2020

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In this study, the light output of a zinc selenide activated with tellurium (ZnSe: Te) single crystal was measured for X-ray radiography applications. A cubic crystal (10 × 10 × 10 mm) was irradiated using X-rays with tube voltages from 50 to 130 kV. The resulting energy absorption efficiency, detective quantum efficiency, and absolute luminescence efficiency were compared to published data for equally sized GSO: Ce (gadolinium orthosilicate) and BGO (bismuth germanium oxide) crystals. The emitted light was examined to estimate the spectral compatibility with widely used optical sensors. Energy absorption efficiency and detective quantum efficiency of ZnSe: Te and BGO were found to be similar, within the X-ray energies in question. Light output of all three crystals showed a tendency to increase with increasing X-ray tube voltage, but ZnSe: Te stood at least 2 EU higher than the others. ZnSe: Te can be coupled effectively with certain complementary metal–oxide–semiconductors (CMOS), photocathodes, and charge-coupled-devices (CCD), as the effective luminescence efficiency results assert. These properties render the material suitable for various imaging applications, dual-energy arrays included.

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“…Solid-state scintillation detectors containing scintillation crystals and silicon --photodiodes are widely used in radiometers, dosimeters, and spectrometers, in technological equipment for customs and security control, medical diagnostics, environmental monitoring, and others [1]. In order to register radiation of various types, various scintillation detectors are currently used.…”

Section: Introductionmentioning

confidence: 99%

Mixed ZnSxSe1–x Crystals as a Possible Material for Alpha-Particle and X-ray Detectors

Trubaieva¹,

Chaika²,

Zelenskaya³

2018

Ukr. J. Phys.

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A possibility to use ZnSxSe1−x as a material for the detection of X-rays and alpha particles has been studied. The influence of the sulfur content on the properties of bulk ZnSxSe1−x crystals is analyzed. Six specimens with different component contents were grown, by using the Bridgman–Stockbarger method: ZnS0.07Se0.93, ZnS0.15Se0.85, ZnS0.22Se0.78, ZnS0.28Se0.72, ZnS0.32Se0.68, and ZnS0.39Se0.61. The intensity of X-ray luminescence spectra of ZnSxSe1−x crystals is found to increase with the sulfur content and reaches a maximum for the composition ZnS0.22Se0.78. The luminescence light yield of mixed ZnSxSe1−x crystals is higher than that of commercial ZnSe(Te) and ZnSe(Al) crystals. The advantages of mixed crystals based onZnSxSe1−x over the ZnS(Te) and ZnSe(Al) crystals have been discussed.

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Distribution of tellurium in melt-grown ZnSe(Te) crystals

Cited by 8 publications

References 0 publications

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

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

On the Optical Response of Tellurium Activated Zinc Selenide ZnSe:Te Single Crystal

Mixed ZnSxSe1–x Crystals as a Possible Material for Alpha-Particle and X-ray Detectors

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