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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >The Effect of Pressure and of Controlled Stretch on the Luminescent Properties of 9,10-Bis(phenylethynyl) Anthracene
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The Effect of Pressure and of Controlled Stretch on the Luminescent Properties of 9,10-Bis(phenylethynyl) Anthracene

机译：压力和受控拉伸对9,10-双（苯基乙炔基）蒽的发光性能的影响

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摘要

The luminescence properties of 9,10-bis(phenylethynyl) anthracene have been investigated in solid poly-(vinyl acetate) (PVAc) and a copolymer of vinyl chloride (VCl) and vinyl acetate (VAc) as afunction of pressure to 65 kbar and of controlled stretch over a range of up to 4 times the original length using the 400 nm line of a frequency-doubled Ti:sapphire laser. With increasing pressure, the intensity (corrected for the absorption at 400 nm) decreases significantly and there is a distinct change in peak shape in the region of 20-40 kbar. In this region, the lifetime increases from 3.5 ± 02. to 4.0 ± 0.2 ns. The result can be explained on the basis of the analysis of Levitus and Garcia-Garibay. The red shift of the absorption peak is equivalent to a blue shift of the excitation laser, which results in excitation of a different polarization of the molecule. Up to a stretch of 2, the controlled stretch produces an increase of intensity for laser excitation polarized in the direction of stretch and a decrease for excitation polarized at 90 ° to the stretch, indicating that molecules are being oriented preferentially with the stretch. At larger stretches, there is a very similar increase in emission intensity for both orientations of the exciting light. Various aspects of the observations are considered but there appears to be no simple explanation for the apparent increase in oscillator strength.
机译：已经研究了在固体聚乙酸乙烯酯（PVAc）和氯乙烯（VCl）和乙酸乙烯酯（VAc）的共聚物中，9,10-双（苯基乙炔基）蒽的发光特性随压力变化到65 kbar和使用倍频的Ti：蓝宝石激光器的400 nm线在高达原始长度的4倍的范围内进行受控拉伸。随着压力的增加，强度（针对400 nm处的吸收进行校正）显着降低，并且在20-40 kbar的区域内峰形发生明显变化。在该区域中，寿命从3.5±02.增加到4.0±0.2 ns。结果可以在对Levitus和Garcia-Garibay的分析的基础上进行解释。吸收峰的红移等效于激发激光器的蓝移，这导致激发分子的不同极化。直到拉伸段2，受控的拉伸段都会使在拉伸方向上偏振的激光激发强度增加，而在拉伸段90°处偏振的激发强度降低，这表明分子在拉伸时优先取向。在较大的范围内，激发光的两个方向的发射强度都有非常相似的增加。考虑了观察的各个方面，但是对于振荡器强度的明显增加似乎没有简单的解释。

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