ABSOLUTE LUMINESCENCE YIELD OF CRESYL VIOLET - STANDARD FOR THE RED
ABSOLUTE LUMINESCENCE YIELD OF CRESYL VIOLET - STANDARD FOR THE RED
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DOI：
10.1021/j100469a012
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发表时间：
1979-01-01
影响因子：
--
通讯作者：
OLMSTED, J
中科院分区：
文献类型：
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作者：
MAGDE, D;BRANNON, JH;OLMSTED, J
我们测量了恶嗪染料甲酚紫在甲醇中的时间为 0.54 秒，在 22°C 下，从 540 到 640 nm 激发。平均发射波长接近 638 nm，这应该是一个有用的红色发光量子产率标准。我们判断我们的绝对精度在 10% 以内，可能优于 5%。产率对条件相当不敏感，甚至包括溶剂的选择。从极端稀释到高于 10~ 4 M；但吸收-发射重叠使其成为仅适用于使用“稀释”程序的相对测量的方便标准。我们采用了两种独立且完全不同的量热方法来实现独立于所有先前发光产率数据的绝对测量：光微量热法（一种优化的传统技术）和热晕分析（一种新的激光方法）。
We measure(for the oxazine dye cresyl violet to be 0.54 s in methanol, at 22 C, for excitation from 540 to 640 nm. With a mean emission wavelength near 638 nm, this should be a useful luminescence quantum yield standard for the red. We judge our absolute accuracy to be well within 10% and probably better than 5%. The yield is rather insensitive to conditions even including choice of solvent. It is constant from extreme dilution up to above 10~ 4 M; but absorption-emission overlap makes it a convenient standard only for relative mea-surements which use “dilute” procedures. We employed two independent and completelydifferent calorimetric methods to achieve an absolute measurement which is independent of all previous luminescence yield data: photomicrocalorimetry, an optimized conventional technique, and thermal blooming, a new laser approach. We report also determinations relative to presently accepted standards.