Materials, Photonic Devices, and Sensors

Synthesis and photoluminescence properties of cerium-doped terbium–yttrium aluminum garnet phosphor for white light-emitting diodes applications

[+] Author Affiliations
Jun Wang

Chongqing University of Arts and Sciences, Research Institute for New Materials Technology, NO. 319, Honghe Avenue, Yongchuan District, Chongqing 402160, China

Chongqing University of Technology, School of Material Science and Engineering, Banan Chongqing 400054, China

Tao Han, Tianchun Lang, Mingjing Tu, Lingling Peng

Chongqing University of Arts and Sciences, Research Institute for New Materials Technology, NO. 319, Honghe Avenue, Yongchuan District, Chongqing 402160, China

Opt. Eng. 54(11), 117106 (Nov 16, 2015). doi:10.1117/1.OE.54.11.117106
History: Received July 13, 2015; Accepted October 16, 2015
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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 (TbxY1x)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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Jun Wang ; Tao Han ; Tianchun Lang ; Mingjing Tu and Lingling Peng
"Synthesis and photoluminescence properties of cerium-doped terbium–yttrium aluminum garnet phosphor for white light-emitting diodes applications", Opt. Eng. 54(11), 117106 (Nov 16, 2015). ; http://dx.doi.org/10.1117/1.OE.54.11.117106


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