Radioluminescence, thermoluminescence and dosimetric properties of ZnO ceramics

Abstract

Two types of ZnO ceramics were fabricated and characterized by XRD, SEM methods. The radioluminescence spectra were measured within the 300-550 K range. The defect luminescence band peaking at ~2.35 eV is the dominant one in radioluminescence spectra in both of the fabricated ceramics. The thermostimulated luminescence (TSL) glow-curves were measured after X-ray irradiation at 300 K. It was concluded that the complex overlapping peak within the 320-450 K temperature range consists of two components (~360-375 K and 400-420 K). The ratio of component intensities differs in both ceramics. The positions of high temperature TSL components (480-520 K) also differ in both samples; therefore not only sintering conditions but also the properties of the initial powder are very important for characteristics of TSL. A linear dependence of peak intensity on irradiation dose was observed up to ~3 kGy for ceramic 1 and up to 9 kGy for ceramic 2.

The Influence of Recrystallization on Zinc Oxide Microstructures Synthesized with Sol–Gel Method on Scintillating Properties

“…The 650_18 layer exhibits an additional narrow peak at around 380 nm, which is characteristic of zinc oxide. This band can be assigned to excitonic luminescence [8,33]. A similar conclusion can be made about the weak broadband peaking at 650-800 nm, which may be correlated with defect-related emission [5,34].…”

Механизмы люминесценции ZnO в видимой области спектра

“…Было показано, что полоса люминесценции 520 nm связана с кислородными вакансиями, а полоса 580 nm (ЖЛ)с вакансиями цинка. Керамики ZnO также обладали коротковолновым и длинноволновым излучением при избытке цинка и кислорода соответственно [20].…”

Development of Ag-Doped ZnO Thin Films and Thermoluminescence (TLD) Characteristics for Radiation Technology

“…This result depends on the dosimeter's ability to keep light emitting through it. Most researchers focus on block form dosimeters such as pellets, chips, and discs [4,[14][15][16][17]. In contrast, a few researchers have used limited efforts to investigate nanocomposites with a creative design of 2D thin films to serve as TL materials [18].…”

“…Additionally, the 2D design of the dosimeter with a high resolution is essential in modern radiotherapy, for modalities where steep gradients of dose distributions occur. Moreover, overcoming the problems associated with measuring depth dosage distributions is desirable [14,23,24].…”