FLUORESCENCE QUANTUM YIELD DETERMINATIONS - 9,10-DIPHENYLANTHRACENE AS A REFERENCE-STANDARD IN DIFFERENT SOLVENTS
FLUORESCENCE QUANTUM YIELD DETERMINATIONS - 9,10-DIPHENYLANTHRACENE AS A REFERENCE-STANDARD IN DIFFERENT SOLVENTS
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DOI：
10.1021/j100550a010
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发表时间：
1976-01-01
影响因子：
--
通讯作者：
HUBER, JR
中科院分区：
文献类型：
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作者：
MORRIS, JV;MAHANEY, MA;HUBER, JR
关于9，10-二苯基菲(DPA)的光物理性质一直存在争议，DPA是一种流行的发射量子产额标准。为了阐明文献中不一致的原因，测量了DPA在乙醇、3-甲基戊烷、环己烷和苯溶液中的荧光量子产率、寿命和振子强度。通过测量DPA在环己烷中的一系列浓度的测量寿命，突出了高浓度和自吸收的影响，表明DPA中0-0带的光密度必须保持在0.05/cm以下才能避免重吸收。有人提出，这些效应构成了对文献中差异的部分解释。此外，还讨论了样品ns的折射率与参考nr之差的修正因子ns2/nr2在量子产额测量中的普遍应用。通过可变狭缝布置，我们证明了适当的校正是样品隔室几何形状的强函数。这一效果表明，广泛使用标准校正项也可能提供误差来源。考虑到这些缺陷，测定了DPA在293K下的荧光量子产率和寿命：0.95，8.19 ns在乙醇中；0.93，7.88 ns；0.86，7.58 ns；0.82，7.34 ns。
A controversy has arisen regarding the photophysical properties of 9, 10-diphenylanthracene (DPA), a pop-ular emission quantum yield standard. In order to elucidate the causes of the disagreement in the litera-ture, fluorescence quantum yields, lifetimes, and oscillator strength's were measured for DPA in ethanol, 3-methylpentane, cyclohexane, and benzene solutions. The effects of high concentrations and self-absorp-tion were dramatized by determining the measured lifetime for a series of concentrations of DPA in cyclo-hexane, demonstrating that the optical density in the 0-0 band must be kept below 0.05/cm in DPA to avoid reabsorption. It is proposed that these effectsconstitute a partial explanation for thediscrepancies in the literature. In addition, the universal application in quantum yieldmeasurements of the correctionfac-tor ns2/nr2 for differences between the index of refraction of the sample ns and the reference nr is ques-tioned. By means of a variable slit arrangement, we have shown that theproper correction is a strong func-tion of the geometry of thesample compartment. This effect suggests that wide utilization of the standard correction term may also provide a source of error. Taking these deficiencies into consideration the following fluorescence quantum yields and lifetimes of DPA at 293 K were determined: 0.95, 8.19 ns in ethanol; 0.93, 7.88 ns in 3-methylpentane; 0.86, 7.58 ns in cyclohexane; 0.82, 7.34 ns in benzene.