High luminance YAG:Ce nanoparticles fabricated from urea added aqueous precursor by flame process
High luminance YAG:Ce nanoparticles fabricated from urea added aqueous precursor by flame process
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DOI：
10.1016/j.jallcom.2007.09.023
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发表时间：
2008-09-08
影响因子：
6.2
通讯作者：
Okuyama, Kikuo
中科院分区：
文献类型：
--
作者：
Purwanto, Agus;Wang, Wei-Ning;Okuyama, Kikuo
采用火焰辅助喷雾热解（FASP）法制备了高亮度Y3Al5O12:Ce3+ (YAG:Ce)纳米颗粒。硝酸前驱体中尿素的加入对YAG:Ce纳米颗粒的形成和光学性能的改善起着重要的作用。尿素在火焰区的分解和燃烧为颗粒提供了额外的热量，再加上大量气体的演化，有助于纳米颗粒的形成。制备的纳米颗粒为六方YAG:Ce，形貌接近球形，表面粗糙，致密，经1200℃退火4 h后可转化为YAG:Ce。热处理后的颗粒为单晶，表面光滑，致密，平均尺寸约为50 nm。YAG:Cc纳米粒子的最佳铈掺杂浓度为4.0 at。，量子效率为45.0%。这种量子效率与其他工艺生产的YAG:Ce纳米粒子相当。元素作图分析表明，YAG:Cc纳米粒子的高效发射也源于YAG主体材料中相对较好的Cc离子分布。(C) 2007 Elsevier B.V.版权所有
High luminance Y3Al5O12:Ce3+ (YAG:Ce) nanoparticles were prepared from urea-added nitrate aqueous precursor by flame-assisted spray pyrolysis (FASP). The addition of urea into nitrate precursor plays an important role in YAG:Ce nanoparticle formation and in improving its optical performance. The decomposition and combustion of urea in the flame zone provides additional heat to the particles, which coupled with the evolution of large volumes of gasses, contributes to nanoparticle formation. The as-prepared nanoparticles are hexagonal YAlO3, that are nearly spherical, rough on the surface and dense-and they can be converted to YAG:Ce after being annealed at 1200 degrees C for 4 h. The heat-treated particles are single crystalline, smooth in surface and dense with an average size around 50 nm. The optimum cerium-doping concentration of YAG:Cc nanoparticles is 4.0 at.%, which exhibits quantum efficiency of 45.0%. This quantum efficiency is comparable with that of YAG:Ce nanoparticles produced from other processes. The efficient emission of YAG:Cc nanoparticles also originates from a relatively good distribution of Cc ions incorporated into the host material of YAG as evidenced from the elemental mapping analysis. (C) 2007 Elsevier B.V. All rights reserved.