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《Chinese Journal of Luminescence》 2002-06
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Combustion Synthesis of SrAl_(12)O_(19)∶Eu~(2+)

LIU Sheng li, CHEN Zheng, GUO Shun zhi (Department of Chemistry, Xiangtan Normal University, Xiangtan 411201, China)  
Eu 2+ activated aluminates are efficiently luminescent materials. But they are usually synthesized by solid reaction method,which requires high synthesis temperature and repeated firing in reducing atmosphere,and therefore requires expensive equipment and high consumption of energy. Some synthesis methods which are different from solid reaction method have been used in preparation of aluminate phosphors. The aluminate phosphor, SrAl 12 O 19 ∶Eu 2+ , has been synthesized by the combustion of corresponding metal nitrates and urea at 600℃ furnace temperature,with the excess of urea and a cover above the reaction vessel.The process is energy saving,instantaneous and safe.The product is in hexagonal system and pure phase.The excitation spectrum of the sample is a wide band,of which the strongest peak is at 273nm.The emission spectrum is a band peaking at 395nm.No characteristic excitation and emission of Eu 3+ were observed,showing that the Eu 3+ had been reduced completely. The result showed that an appropriate excess of urea and a relatively airtight reaction system are beneficial to the gain of the pure phase and one color luminescence product in the preparation of Eu 2+ activated aluminate phosphor.When only theoretical amount of urea was added and the cover was not used,the emission of Eu 3+ in the product could be observed.Furthermore,the characteristic emission of Eu 3+ in SrAl 2O 4 was also seen suggesting that the product is not in pure phase under the later synthesis conditions.
【Fund】: 湖南省教委资助项目 (98B0 94)
【CateGory Index】: O482.31
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