Red-emitting LiEuW2O8 phosphor for white emitting diodes prepared by sol-gel process

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作者：

Department of Biomedical Engineering, Nambu University, 864-1 Wolgye-dong, Gwangsan-gu, Gwangju 506-824, Korea, Republic of ^{[1
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来源：

Opt Appl | 2009年 / 2卷 / 375-382期

关键词：

Characteristic emission - Color conversions - High-temperature annealing - Near ultraviolet - Near uv - Optical function - Red-light emission - Tetragonal system;

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摘要：

Scheelite-type LiEuW2O8 (LEW) phosphors with the optical function of color conversion from near-UV to red were prepared by sol-gel method using a lithium acetate dehydrate, europium(III) nitrate pentahydrate, and tungsten(VI) chloride as starting materials. Viscous mixing sol was prefired at 300 °C for 120 min in air and then white powder precursor was finally annealed at 500-800 °C for 240 min in Ar. From an X-ray diffraction analysis, all the samples are isostructural and belong to the tetragonal system of scheelite-type. The main emission peak is 5D0→ 7F2 transitions of Eu 3+ at 615 nm, other transitions from the 5D0 →7F1, 5D0→ 7F3 and 5D0 → 7F4 located at 570-700 nm range are weak. The characteristic emission of WO4-2 in LEW is quenched absolutely and only red-light emission of Eu3+ appears. Crystallinity, surface properties and red-emission by near-ultraviolet (395 nm) were improved by high-temperature annealing.

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