期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 4, 期 15, 页码 3313-3320出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc00056h
关键词
-
资金
- National Science Foundation of China [11179037]
- National Basic Research Program of China (973 Program) [2012CB922004]
- CNPC-CAS Strategic cooperation Research Program [2015A-4812]
- Provincial Teaching Research Project of Anhui Province [2014jyxm010]
Nitrogen-doped gamma-Ca2SiO4:Ce3+ phosphors were successfully produced by a saki state reaction method provided that the Ca/Si molar ratio was >2.05 and N-doping was simultaneously >0.75%. The factors that affect the beta -> gamma phase transformation were also thoroughly investigated. Experimental results were obtained by XRD, FTIR, NMR, SEM, and TEM techniques, along with EDS and SAED analyses. First -principles theoretical calculations were also done. The results showed that the phosphors produced have high photoluminescence and thermal quenching properties, attributed to the covalent nature of the Si-N bond, and the optimum amount of nitrogen incorporation is 0.75%, whereas further increases in nitrogen content degrade the above properties, probably due to the increase in the formation of oxygen vacancies. It was also shown that gamma-Ca2SiO4:Ce3+ is thermodynamically more stable than beta-Ca2SiO4:Ce3+ after nitrogen doping. A dramatic shift in the emission from yellow to light-blue was recorded when the phosphors were heated to 800 C. This was attributed to the migration of Ce3+ from Ca(1) to Ca(2) sites in the 7 -phase, which is confirmed by 4f -> 5d transition energy calculations.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据