燃烧法合成SrAl_(12)O_(19)∶Eu^(2+)

Combustion Synthesis of SrAl_(12)O_(19)∶Eu^(2+)

利用相应的金属硝酸盐和尿素之间发生的氧化还原反应 ,在 60 0℃的炉温下 ,制备了发蓝光的铝酸盐发光粉SrAl12 O19∶Eu2 + ,产物为六方晶系。研究结果表明 ,在制备Eu2 + 激活的铝酸盐发光粉时 ,适当过量的尿素用量和相对密闭的反应体系有利于获得纯相和单一发光颜色的产物。

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.