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npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
Qrcode

Article

Research Paper

New Physics: Sae Mulli 2012; 62: 750-754

Published online July 31, 2012 https://doi.org/10.3938/NPSM.62.750

Copyright © New Physics: Sae Mulli.

Luminescence Properties of KYF$_4$:Eu$^{3+}$ Crystals

Kyoung Hyuk JANG*, Jae Heung KOO

Department of Physics, Pukyong National University, Busan 608-737

Correspondence to:khjang@gmail.com

Abstract

The luminescence properties of KYF$_4$:Eu$^{3+}$ crystals were investigated by using site-selective laser-excitation spectroscopy at 20 K. The crystals were grown by using the hydrothermal method. The Five Eu$^{3+}$ centers were identified in the  $^{7}$F$_0$ → $^{5}$D$_0$ excitation spectrum. Five different emission spectra were obtained under excitation at each excitation line. The splittings of $^{7}$F$_1$ multiplets confirmed that two different types of Eu$^{3+}$ sites, existed one group corresponding to Eu$^{3+}$ ions at isolated sites and the other group corresponding to Eu$^{3+}$ ions at the chain in the KYF$_4$ crystal. The Eu$^{3+}$ ions with the highest $^{5}$D$_0$ level were found to give rise to energy transfer to other ions in the chain.

Keywords: KYF$_4$ , Eu$^{3+}$, Laser spectroscopy, Photoluminescence

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