在18至300 K的温度范围内,对聚乙炔的一种单取代衍生物的荧光特性进行了研究.在室温时,这种聚乙炔的单取代衍生物的薄膜能够发出强的绿色荧光,其荧光光谱的主要荧光峰位于510 nm,而它的两个次要荧光峰分别位于440 nm和380 nm.位于510、440 nm的两个荧光峰分别是该高分子材料所形成的激发缔合物的主要和次要发光峰,而位于380 nm的荧光峰是单条高分子链的发光峰.当温度从300 K降到18 K的过程中,原荧光光谱发生中的激发缔合物的主要发光峰从510 nm逐渐红移到570 nm,而其激发缔合物的次要发光峰逐渐消失;与此同时,该高分子材料的380 nm的荧光峰逐渐与主荧光峰分开.这些光谱方面的变化可用该高分子在低温下所发生的结构上的变化来解释.
The light emitting properties from solid films of a mono-substituted polyacetylene,poly{n-[(4'-hexylcarbonyl-biphenyl-4-oxy)]-1-propyne}, are investigated as temperature drops from 300 to 18 K. At room temperature, the solid films of the polymer give off intense green photoluminescence with its dominant emission band and two minor emission bands located at 510, 440 and 380 nm, respectively. The 510 and 440 nm emission bands can be assigned to the primary and the secondary excimer emissions of the polymer while the 380 nm emission band can be assigned to the emission from the isolated chain of the polymer. When the temperature drops from 300 to 18 K,the primary excimer emission band is red shifted from 510 to 560 nm while the secondary excimer emission at 440 nm disappears gradually, leaving the emission from isolated chain of the polymer separated from its excimer emission bands. These temperature-introduced changes in the photoluminescence are explained in terms of the morphological changes in the polymer at low temperature.
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