Abnormal improvement in emission of LANTHANUM OXYSULFIDE (cas 12031-43-5) phosphor La2O2S:Tb3+ synthesized by a novel method, thermal decomposition in eutectic molten salt

Add time:07/26/2019    Source:sciencedirect.com

The LANTHANUM OXYSULFIDE (cas 12031-43-5) phosphor La2O2S:Tb3+ is generally synthesized by the direct sulfidation of La2O3 using H2S or CS2 gas. However, these gases are known to be highly toxic to humans. In this paper, a new synthesis method that uses 0.6Li2SO4–0.4Na2SO4 as the flux is proposed for obtaining La2O2S:Tb3+ phosphor, without the need for H2S or CS2 gas. The proposed method consists of two steps: 1) oxidation to obtain La2O2SO4 and 2) reduction to reduce La2O2SO4 to La2O2S. Using this novel method, (La1−xTbx)2O2S (0.01≤x≤0.13) were successfully synthesized in a single-phase form. The synthesized phosphors exhibited extraordinary luminescence behavior. Further, despite their low Tb3+ ion content, the phosphors showed high emission intensities. The relative emission intensity of (La0.95Tb0.05)2O2S (λex=270 nm) was 132% that of the commercial green-emitting phosphor (La0.52Ce0.31Tb0.17)PO4 (λex=285 nm), which shows the highest excitation absorption.

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