Synthesis and Property Investigation on the Spherical Lu₃Al₅O₁₂:Tb³⁺ Phosphor with Green Emitting

Abstract:

Spherical phosphors of (Lu_1-xTb_x)₃Al₅O₁₂ [(Lu_1-xTb_x)AG] have been obtained through homogeneous precipitation method using urea as the precipitant and rare earth nitrate as mother salts. The synthesis, phase evolution and photoluminescent properties of the (Lu_1-xTb_x)AG phosphors were tested by XRD, FE-SEM, PLE/PL, and fluorescence decay analysis. The phase pure (Lu_1-xTb_x)AG garnets were formed at 1100 °C or higher temperatures. The phosphors exhibited strong green emissions at ~545 nm (the ⁵D₄→⁷F₅ transitions of Tb³⁺) under ~276 nm excitation. The CIE chromaticity coordinates and color temperature were determined to be (~0.36, ~0.56) and ~5100 K, respectively. The intensity of 545 nm emission increased with the Tb³⁺ content increasing to 7 at%, and then gradually decreases owing to the concentration quenching. The lifetime of 545 nm emission decreases at a higher Tb³⁺ addition. The spherical (Lu_1-xTb_x)AG garnet phosphors developed in the this work were expected to be widely used in lighting and displaying areas.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 735-740
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.735
• Online since: August 2018
• Authors: H.D. Wang*, Tao Wu, Jian Zhang, Tao Wang, Shu Qin Li
• Keywords: Lu₃Al₅O₁₂ Garnet, Luminescent Property, Spherical Phosphors, Tb³⁺ Doped

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