16 November 2015 Synthesis and photoluminescence properties of cerium-doped terbium–yttrium aluminum garnet phosphor for white light-emitting diodes applications
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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 (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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Jun Wang, Tao Han, Tianchun Lang, Mingjing Tu, Lingling Peng, "Synthesis and photoluminescence properties of cerium-doped terbium–yttrium aluminum garnet phosphor for white light-emitting diodes applications," Optical Engineering 54(11), 117106 (16 November 2015). https://doi.org/10.1117/1.OE.54.11.117106 . Submission:
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