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

Jun Wang; Tao Han; Tianchun Lang; Mingjing Tu; Lingling Peng

doi:10.1117/1.OE.54.11.117106

16 November 2015 Synthesis and photoluminescence properties of cerium-doped terbium–yttrium aluminum garnet phosphor for white light-emitting diodes applications

Jun Wang, Tao Han, Tianchun Lang, Mingjing Tu, Lingling Peng

Author Affiliations +

Optical Engineering, Vol. 54, Issue 11, 117106 (November 2015). https://doi.org/10.1117/1.OE.54.11.117106

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 (Tb_xY_1−x)_2.9Al₅O₁₂∶Ce0.1 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 (Tb_0.4Y_0.6)_2.9Al₅O₁₂∶Ce0.1 phosphors WLEDs showed good optical properties.

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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," Optical Engineering 54(11), 117106 (16 November 2015). https://doi.org/10.1117/1.OE.54.11.117106

Published: 16 November 2015

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