npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2020; 70: 412-418

Published online May 29, 2020 https://doi.org/10.3938/NPSM.70.412

Copyright © New Physics: Sae Mulli.

Reduction Effect on the Optical Properties of the Eu$^{2+}$ Doped Sr$_{3}$Al$_{2}$O$_{5}$Cl$_{2}$

Purevdulam NAMKHAI, Kiwan JANG*

Department of Physics, Changwon National University, Changwon 51140, Korea

Correspondence to:kwjang@changwon.ac.kr

Received: January 15, 2020; Revised: April 3, 2020; Accepted: April 20, 2020

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We fabricated a series of Sr$_{3}$Al$_{2}$O$_{5}$Cl$_{2}$ phosphors activated with divalent europium ions by using the different reduction methods and studied the reduction effect on the excitation and emission spectra of Eu$^{2+}$ ions doped in Sr$_{3}$Al$_{2}$O$_{5}$Cl$_{2}$. The XRD patterns of the samples were very consistent with the ICSD-68365[Sr$_{3}$Al$_{2}$O$_{5}$Cl$_{2}$] but the excitation spectra of Eu$^{2+}$ depended highly on the reduction method of Eu$^{3+}$ to Eu$^{2+}$. However, the emission spectra normalized to maximum emission intensity were quite similar for all the studied samples. The maximum emission intensity was observed at 620 nm, and the full width at half maximum of the emission spectrum was about 160 nm. Thus, we suggest that Sr$_{3}$Al$_{2}$O$_{5}$Cl$_{2}$:Eu$^{2+}$ phosphors combined with a blue LED chip has high potential for applications as a warm white light source. Through this study, we were the first, to the best of our knowledge, to confirm experimentally that the process of reducing Eu$^{3+}$ to Eu$^{2}$ depends highly on the reduction atmosphere.

Keywords: Sr$_{3}$Al$_{2}$O$_{5}$Cl$_{2}$, Eu$^{2+}$, Photoluminescence, Orange-red phosphor, White LED, Solid state reaction method, Reduction method

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