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Optical Engineering

Synthesis and photoluminescence properties of cerium-doped terbium–yttrium aluminum garnet phosphor for white light-emitting diodes applications
Author(s): Jun Wang; Tao Han; Tianchun Lang; Mingjing Tu; Lingling Peng
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Paper Abstract

Cerium-doped terbium–yttrium aluminum garnet phosphors were synthesized using the solid-state reaction method. The crystalline phase, morphology, and photoluminescence properties were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), and fluorescence spectrophotometer, respectively. The XRD results indicate that with an increase of the amount of x (Tb3+), all of the samples have a pure garnet crystal structure without secondary phases. The SEM images reveal that the samples are composed of sphere-like crystallites, which exhibit different degrees of agglomeration. The luminescent properties of Ce3+ ions in (TbxY1−x)2.9Al5O12Ce0.1 have been studied, and it was found that the emission band shifted toward a longer wavelength. The redshift is attributed to the lowering of the 5d energy level centroid of Ce3+, which can be explained by the nephelauxetic effect and compression effect. These phosphors were coated on blue light-emitting diode (LED) chips to fabricate white light-emitting diodes (WLEDs), and their color-rendering indices, color temperatures, and luminous efficiencies were measured. As a consequence of the addition of Tb3+, the blue LED pumped (Tb0.4Y0.6)2.9Al5O12Ce0.1 phosphors WLEDs showed good optical properties.

Paper Details

Date Published: 16 November 2015
PDF: 7 pages
Opt. Eng. 54(11) 117106 doi: 10.1117/1.OE.54.11.117106
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Jun Wang, Chongqing Univ. of Arts and Sciences (China)
Chongqing Univ. of Technology (China)
Tao Han, Chongqing Univ. of Arts and Sciences (China)
Tianchun Lang, Chongqing Univ. of Arts and Sciences (China)
Mingjing Tu, Chongqing Univ. of Arts and Sciences (China)
Lingling Peng, Chongqing Univ. of Arts and Sciences (China)

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