Fluorescence excitation spectroscopic characterisation of F2- colour centers in a LiF crystal
Fluorescence excitation spectroscopic characterisation of F2- colour centers in a LiF crystal
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DOI：
10.1007/s00340-003-1268-6
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发表时间：
2003-11-01
影响因子：
2.1
通讯作者：
Tsuboi, T
中科院分区：
文献类型：
--
作者：
Birkmann, C;Penzkofer, A;Tsuboi, T
具有F-2（-）心的LiF晶体包含一系列具有光谱重叠吸收光谱的F基色心。在短波长侧，F-2（-）中心的吸收光谱与其他色心的吸收光谱重叠，因此不能通过透射测量直接获得。荧光激发光谱在这里被用来获得信息的吸收光谱的F-2（-）中心的光谱区域中的其他中心的吸收存在。在350 nm至1100 nm的范围内，作为激发波长的函数检测超过1200 nm发射的荧光信号。由荧光激发量子分布和透射光谱确定690 nm至1100 nm和350 nm至410 nm波长范围内的F-2（-）中心吸收截面光谱。讨论了荧光重吸收和Forster型能量转移对荧光激发量子分布的影响以及随后的F-2（-）心吸收截面测定。
LiF crystals with F-2(-) centers contain a whole series of F-based colour centers with spectrally overlapping absorption spectra. On the short-wavelength side the absorption spectrum of the F-2(-) centers is overlapping with the absorption spectra of other colour centers and is therefore not directly accessible by transmission measurements. Fluorescence excitation spectroscopy is employed here to gain information on the absorption spectrum of F-2(-) centers in spectral regions where the absorption by other centers is present. The fluorescence signal emitted beyond 1200 nm is detected as a function of the excitation wavelength in the range from 350 nm to 1100 nm. The F-2(-) center absorption cross-section spectrum in the wavelength range from 690 nm to 1100 nm and from 350 nm to 410 nm is determined from the fluorescence excitation quantum distribution and the transmission spectrum. Influences of fluorescence re-absorption and Forster-type energy transfer on the fluorescence excitation quantum distribution and the subsequent F-2(-) center absorption cross-section determination are discussed.