期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 4, 期 45, 页码 10691-10700出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc02763f
关键词
-
资金
- National Natural Science Foundation of China [51171007, 51102006, 51271009]
As candidates for display and lighting optical materials, yttrium aluminum garnet nanophosphors co-doped with Ce3+ and Ga3+ ions (YAG:Ce,Ga) were successfully synthesized via a facile sol-gel method. We used multiple characterization techniques to study the local crystal structure of Ce3+ activators and examine the preferential position of Ga3+ ions in YAG: Ce, Ga nanophosphors. For the first time, solid-state nuclear magnetic resonance spectroscopy was used to confirm that Ga3+ ions preferentially replaced the octahedral Al3+ ions in a wide Ga3+ concentration range. The replacement caused the expansion of the lattice constant and decreased the local crystal field strength surrounding Ce3+ activators that located in the dodecahedral sites, which were beneficial to the luminescence emission of Ce3+ ions. The YAG: Ce, Ga nanophosphors with excellent photoluminescence properties were obtained by optimizing the calcination temperature (930 degrees C) and Ga3+-doping concentration (18 at%). The optimized nanophosphors displayed stronger luminescence emission with a desirable blue shift than classic YAG: Ce phosphors, and presented a short fluorescence lifetime of similar to 24 ns and a long fluorescence lifetime of similar to 85 ns.
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