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Metal carboxylates; Sr₂EuAlO₅; Phosphor.

Moisture-insensitive metal carboxylates that are mostly liquids at room temperature have been first applied to the preparation of strontium europium aluminate (Sr₂EuAlO₅) powders for red-emitting phosphor under near ultraviolet radiation. Strontium naphthenate, aluminium-2-ethylhexanoate and europium-2-ethylhexanoate were dissolved with toluene to prepare starting solution. Precursor pyrolyzed at 500 °C for 240 min was finally annealed at 900–1200 °C for 240 min in Ar. X-ray diffraction analysis, field emission–scanning electron microscope and fluorescent spectrophotometer were used to evaluate structural and optical properties. For the 1000 °C-annealed powders with regular shape and narrow size distribution confirmed by FE–SEM observation, strong red emission at 615nm under the excitation of 395nm maximum was reached, then the higher annealed samples at above 1100 °C gave the lower emission intensities.

Kyu-Seog Hwang¹ Sung-Dae Kim¹ Seung Hwangbo² Jin-Tae Kim³

1. Department of Biomedical Engineering, Nambu University, 864-1 Wolgye-dong, Gwangsan-gu, Gwangju 506824, Korea
2. Department of Electronic and Photonic Engineering, Honam University, 59-1 Seobong-dong, Gwangsan-gu, Gwangju 506714, Korea
3. Department of Photonic Engineering, Chosun University, 375 Seosuk-dong, Dong-gu, Gwangju 501759, Korea

Published

June 2013

Manuscript received

1 February 2012

Manuscript revised

10 April 2012