Nonadiabatic multi-step excitation for the blue-green light emission from dye grains induced by the near-infrared optical near-field
Nonadiabatic multi-step excitation for the blue-green light emission from dye grains induced by the near-infrared optical near-field
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DOI：
10.1007/s00340-009-3762-y
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发表时间：
2010-02-01
影响因子：
2.1
通讯作者：
Ohtsu, M.
中科院分区：
文献类型：
--
作者：
Fujiwara, H.;Kawazoe, T.;Ohtsu, M.
观察到基于光学近场诱导的非绝热激发过程，由于近红外激发（CW，lambda（ex）= 808 nm），香豆素染料颗粒发出蓝绿光（波长范围：460-520 nm）。确认了最大频率上移 1.17 eV。基于激发强度依赖性，首次证实了源自非绝热三步激发的发光机制。中间激发态的寿命约为1.1-1.9 ps，因此可以预期实现具有快速响应的频率上转换。
Blue-green light emission (wavelength range: 460-520 nm) from coumarin dye grains due to near-infrared excitation (CW, lambda (ex)=808 nm), based on the nonadiabatic excitation process induced by an optical near-field, was observed. A maximum frequency up-shift of 1.17 eV was confirmed. Based on the excitation intensity dependence, a light emission mechanism originating from a nonadiabatic three-step excitation was confirmed for the first time. The lifetime of the intermediate excited state was approximately 1.1-1.9 ps, and thus realization of frequency up-conversion with a rapid response can be expected.