کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
846678 909210 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Violet blue emission and thermoluminescence glow curve analysis of Gd2SiO5:Ce3+ phosphor
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Violet blue emission and thermoluminescence glow curve analysis of Gd2SiO5:Ce3+ phosphor
چکیده انگلیسی

This paper reports synthesis of Ce3+ ions-doped Gd2SiO5 phosphor powders prepared by modified solid state reaction method, which is most suitable method for large-scale production. Starting materials used for sample preparation were Gd2O3, SiO2 and CeO2 with variable concentration of cerium (0.1 mol% to 2.5 mol%) with fixed amount of boric acid (0.05 mol%) as flux. PL excitation spectra was found at 260 nm while the emission spectra was found at 365, 378, 555, 602, 607 and 627 nm for lower Ce3+ doping concentration which are attributed to the Gd3+ ion transitions. For higher concentration of Ce3+ we get broad emission spectra from 350 to 550 nm which is characteristics of Ce3+ ion transition. Commission Internationale de l’Eclairage co-ordinate (CIE) of this phosphor is x = 0.170, y = 0.029, in the violet region for 2.5 mol% of cerium. TL glow curves were recorded for different doses of UV exposure and gamma ray dose at a heating rate of 5° C s−1. The kinetic parameters such as activation energy “E”, the order of kinetics “b”, and the frequency factor “s” of Gd2SiO5:Ce3+ have been calculated by using peak shape method. Sample shows general order kinetics for most of the peaks. The effect of Ce3+ concentration on TL intensity was also studied and found that the intensity is maximum for 0.1 mol% and then decreases with increasing concentration of Ce3+. The present phosphor can acts as a single host for violet-blue emission (2.5 mol%) for display devices as well as may be used for thermoluminescence dosimetric material under UV & gamma dose.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optik - International Journal for Light and Electron Optics - Volume 127, Issue 15, August 2016, Pages 6243–6252
نویسندگان
, , , , ,