摘要
Crystal-site engineering of hexagonal-phase NaGdF4:Mn through alkaline-earth metal (A2+) doping is used to tune the upconversion luminescence of the Mn2+ dopants. Experimental and calculated results show the ability of A2+ doping to alter the occupancy site of Mn2+ ion from Na+ to Gd3+, thus enabling an emission change from green (520 nm) to yellow (583 nm) upon excitation at 980 nm. The yellow emission of Mn2+ shows a long emission lifetime of 65 ms, more than three times longer than the green emission of Mn2+ (20 ms). The combination of tunable long-lived Mn2+ emission with lanthanide emission at a single-particle level provides a convenient route to triple transient upconversion color codes upon dynamic excitation, which offers an attractive optical feature particularly suitable for efficient document encoding.
源语言 | 英语 |
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文章编号 | 1900519 |
期刊 | Advanced Optical Materials |
卷 | 7 |
期 | 15 |
DOI | |
出版状态 | 已出版 - 8月 2019 |