Unusually strong delayed fluorescence of C-70
Unusually strong delayed fluorescence of C-70
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DOI：
10.1021/ja961782s
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发表时间：
1996-10-02
影响因子：
15
通讯作者：
Garcia, JMM
中科院分区：
文献类型：
--
作者：
BerberanSantos, MN;Garcia, JMM
已知C-70（与其他富勒烯一样）具有非常弱的荧光（Phi（F）等于5 × 10（-4）），这是由于三重态形成的高效率。在这项工作中，我们表明，在适当的条件下，荧光量子产率增加了一个或两个数量级（估计最大值Phi（F）= 0.08），通过延迟热荧光的机制。我们还报告了一个新的估计的单重态-三重态间隙（26 +/- 2 kJ mol（-1）），从延迟热荧光的温度依赖性。该值与在相同温度范围内记录的磷光光谱一致。从一种新的数据分析方法获得了三重态形成的量子产率的准确值（0.994 +/-0.001）。
C-70 (like other fullerenes) is known to have a very weak fluorescence (Phi(F) congruent to 5 x 10(-4)), owing to the high efficiency of triplet formation. In this work we show that, under appropriate conditions, the fluorescence quantum yield increases by one or two orders of magnitude (up to an estimated maximum value Phi(F) = 0.08), through the mechanism of delayed thermal fluorescence. We also report a new estimate of the singlet-triplet gap (26 +/- 2 kJ mol(-1)), obtained from the temperature dependence of the delayed thermal fluorescence. This value is shown to be in agreement with the phosphorescence spectrum recorded in the same temperature range. An accurate value of the quantum yield of triplet formation (0.994 +/- 0.001) is obtained from a new method of data analysis.