Preparation and Investigation of Tm³⁺- Doped Li₃Gd₃Te₂O₁₂ Blue-Emitting Phosphor

Abstract:

A novel blue-emitting phosphor, Li₃Gd₃Te₂O₁₂:Tm³⁺ for white light-emitting diodes (W-LEDs) was prepared by solid-state synthesis and its structure and luminescence properties were investigated. This phosphor shows a satisfactory blue performance (peak at 458 nm) due to the ¹D₂ → ³F₄ transition of Tm³⁺ excited by 361 nm light. Investigation of Tm³⁺ content dependent emission spectra indicates that x = 0.03 is the optimum doping content of Tm³⁺ ions in the Li₃Gd₃Te₂O₁₂ host. The critical distance and the concentration quenching mechanism were also investigated. In particular, the color purity of as-prepared sample is close to that of the commercial blue phosphor BaMgAl₁₀O₁₇:Eu²⁺ (BAM:Eu²⁺). The present work suggests that the Li₃Gd₃Te₂O₁₂:Tm³⁺ phosphor is a potential blue-emitting candidate for the application in the near-UV WLEDs.

• Periodical: Materials Science Forum (Volume 921)
• Pages: 111-118
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.921.111
• Online since: May 2018
• Authors: Bin Deng*, Chong Song Zhou, Hui Liu, Jun Chen
• Keywords: Luminescence, Phosphor, Tellurate, Tm³⁺

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