npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Physics: Sae Mulli 2010; 60: 429-434

Published online April 30, 2010 https://doi.org/10.3938/NPSM.60.429

Copyright © New Physics: Sae Mulli.

Crystalline and Surface Morphology Dependent Luminescent Characteristics of Gd-Substituted YVO$_4$:Sm$^{3+}$ Ceramic Phosphors

Soung Soo YI*

Department of Electronic Materials Engineering. Silla University, Busan 617-736

Correspondence to:ssyi@silla.ac.kr

Abstract

Crystalline phase and surface morphology of ceramics are very important factors to determine luminescent characteristic. The Y0.97VO4:Sm3+0.03 and Y0.77Gd0.2VO4:Sm$^{3+}$0.03 ceramic samples were prepared by a solid state reaction method. The crystallinity and surface morphology of the films were investigated using X-ray diffraction (XRD) and scanning electro microscopy (SEM). Photoluminescence (PL) spectra have been measured at room temperature using a luminescence spectrometer and excitation by a broadband incoherent ultraviolet light source with a excitation wavelength of about 322 nm. The emitted radiation was dominated by the red emission peak at 603 nm radiated from the transition of 4G5/2 → 6H7/2 of Sm3+ ions. The PL brightness of Y0.77Gd0.2VO4:Sm$^{3+}$0.03 ceramic was lower than that of Y0.97VO4:Sm$^{3+}$0.03 ceramic. And the PL brightness of both ceramic phosphors was improved as the sintering temperature increased.

Keywords: Crystallinity, Surface Morphology, (Y, Gd)VO4:Sm$^{3+}$, Red Phosphor, Photoluminescence

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