The luminescent properties of GdAlO₃:Tb³⁺ phosphors based on molten salts addition
by Jinkai Li; Wenzhi Wang; Zongming Liu
International Journal of Nanomanufacturing (IJNM), Vol. 15, No. 1/2, 2019

Abstract: The (Gd_1−xTb_x)AlO₃ (x = 0-0.12) were obtained through ammonium bicarbonate co-precipitation technology. The pure-phase (Gd_1−xTb_x)AlO₃ with good dispersion could be obtained at relatively lower temperature of 1,000°C. Under optimum UV excitation into 275 nm, the photoluminescence (PL) spectra display a series of ⁵D₄⁻⁷F_J transitions of Tb³⁺ in (Gd_1−xTb_x)AlO₃ system with the strongest green emission at ~546 nm. The overlapping between ⁸S_7/2⁻⁶I_J intra f-f transition of Gd³⁺ and 4f⁸-4f⁷5d¹ transition of Tb³⁺ at 275 nm suggesting the Gd³⁺ → Tb³⁺ energy transfer, and the quenching contents of Tb³⁺ was found to be ~10 at%. The luminescent property of GdAlO₃:Tb³⁺ phosphor could be further improved with molten salt incorporation. The optimal composition of molten salts was determined to be the mixture of NaCl/Na₂SO₄ (5 wt% NaCl), and the mass ratio of mixture molten salts to precursor was 2:1. The relationship between the luminescent property and molten salts composition were studied in detail.

Online publication date: Mon, 07-Jan-2019

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