Short and excitation-independent fluorescence lifetimes of J-aggregates adsorbed on silver(I) bromide and silica
Short and excitation-independent fluorescence lifetimes of J-aggregates adsorbed on silver(I) bromide and silica
复制标题
吸附在溴化银 (I) 和二氧化硅上的 J-聚集体具有短且与激发无关的荧光寿命
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
T. Tani
中科院分区：
文献类型：
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作者：
K. Kemnitz;K. Yoshihara;T. Tani
在AgBr八面体微晶和硅胶上吸附的菁染料j聚群的激发强度无关的荧光寿命分别短至5和25 ps。聚集体/SiO{sub 2}体系在4 K时的荧光寿命约为120 ps，这归因于j -聚集体在吸附状态下的纯辐射寿命；因此，在环境温度下非常短的荧光寿命似乎是由一个快速的非辐射衰减通道主导的。聚集体/微晶AgBr体系的荧光寿命取决于j聚集体的大小，其本身是由光谱和动力学数据决定的。
Excitation intensity independent fluorescence lifetimes of cyanine dye J-aggregates adsorbed on octahedral microcrystals of AgBr and on silica gel have been observed to be as short as 5 and 25 ps, respectively. The fluorescence lifetime of the aggregate/SiO{sub 2} systems at 4 K is about 120 ps and attributed to the pure radiative lifetimes of the J-aggregate in the adsorbed state; thus the very short fluorescence lifetimes at ambient temperatures seem to be dominated by a fast nonradiative decay channel. The fluorescence lifetimes of the aggregate/microcrystalline AgBr systems are dependent on the size of the J-aggregate, which itself was determined from spectroscopic and kinetic data.