【摘要】 报道了用反滴定共沉淀法及低温煅烧前驱体的方法制备Ce3+s杂的Lu3Al5O12石榴石陶瓷发光粉体的研究。通过对实验中制备的Lu3Al5O12∶Ce前驱体和煅烧粉体进行的X射线粉末衍射(XRD)和透射电镜(TEM)的测试表征表明,在1000℃烧结热处理2 h即可获得完全单一的立方相Lu3Al5O12∶Ce粉体,粉体的平均粒径~30 nm。而随烧结温度的增加,粒径有增大的趋势。在1000℃空气氛热处理的Lu3Al5O12∶0.5%Ce发光粉体具有最强的荧光发射。粉体经干压、等静压成型后,在1800℃经流动的H2气氛常压烧结保温6 h可获得半透明Lu3Al5O12∶0.5%Ce陶瓷。X射线激发下的快分量衰减时间短至十几ns,占发光成分中主要部分的慢分量为~100 ns。更多还原

【Abstract】 Nano-scale Lu3Al5O12 phosphors doped with Ce3+ were synthesized through co-precipitation method by using metal nitrates as the starting materials and NH4HCO3 solution as precipitant.Heat treatment was performed in the temperature range from 850 to 1200 ℃.The crystal structure,particle size and morphology of the precursor and synthesized powders at different calcinations temperature were determined by XRD and TEM.The results indicated that the cubic garnet phase of Lu3Al5O12∶Ce was obtained at 900 ℃.Well-dispersed Lu3Al5O12∶Ce nano-phosphors with favorable luminescence properties were obtained by calcining the precipitate precursor at 1000 ℃ for 2 h,and the particle size increased with the sintering temperature.The optimal content of Ce3+ in Lu3Al5O12 host was 0.5%(atom fraction) under UV light excitation.Translucent Lu3Al5O12∶Ce ceramics could be obtained by sintering in flowing H2 atmosphere at 1800 ℃ for 6 h.The Ce3+ doped Lu3Al5O12 ceramics exhibited rapid decay(ns) under X-ray excitation.更多还原