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These naked-eye-visible fluorescence color changes were recorded on a luminescence spectrophotometer. The spectral data are summarized in Table 1, and the emission spectra of pressed and annealed FLA-Cn samples are depicted in Fig. 4. It can be seen that the emission spectra are very consistent with the corresponding fluorescence colors observed (Fig. 3). The pressing-induced spectral shifts (ΔλPFC= λ加压-λ退火) of FLA-C12, FLA-C5 and FLA-C3 solids are 40, 26, and 18 nm, respectively. This implies that FLA-Cn solids are also chain length-dependent PFC materials, and alkyl chains have played a functional role in tuning the PFC behavior of FLA-Cn although such alkyl elements are normally inactive and undesirable for optoelectronic properties. It is noted that the alkyl lengthdependent PFC behaviour of FLA-Cn is similar to those of 9,10- bis(p-dialkoxylstyryl)anthracenes（10i） and β-cyano-substituted bis(p-alkoxystyryl)benzenes5a but thoroughly different from that of 9,10-bis[(N-alkylcarbazol-3-yl)vinyl]anthracenes.13 The origin for this dichotomous alkyl chain length-dependent PFC behaviour is not clear at present, underlining the complexity of the structure–property relationship of PFC materials. |
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| 这些肉眼可见的荧光颜色变化记录在发光分光光度计上。光谱数据总结于表1，加压和退火FLA-Cn样品的发光光谱见图4。可见，该发光光谱与所观察到的相应荧光颜色非常一致（图3）。加压引起的FLA-C12、FLA-C5和FLA-C3固体的光谱位移（ΔλPFC=λ加压-λ退火）分别是40、26和18纳米。这意味着，FLA-Cn固体也是链长依赖性PFC材料，同时意味着烷基链在调整FLA-Cn的PFC性能中发挥了某种功能作用，虽然这样的烷基元素通常处于非活化状态，而且对光电性能也不利。应该注意，FLA-Cn的烷基长度依赖性PFC性能类似于9,10 - 双（对 - 二烷氧基苯乙烯基）蒽【10I】和β-氰基取代的双（对 - 烷氧基苯乙烯基）苯【5a】，但完全不同于9,10 - 双[（N-烷基咔唑-3 - 基）乙烯基]蒽【13】。目前对于这个二元烷基链长依赖性PFC性能的原因尚不明确，强调了PFC材料结构与性能关系的复杂性。 |
2楼2014-10-21 09:48:19