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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加壓-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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真強(qiáng)必勝: 金幣+1, 謝謝 2014-10-21 14:26:37
yhc0316: 金幣+25, 翻譯EPI+1 2014-10-21 18:21:56

這些肉眼可見的熒光顏色變化記錄在發(fā)光分光光度計(jì)上。光譜數(shù)據(jù)總結(jié)于表1，加壓和退火FLA-Cn樣品的發(fā)光光譜見圖4�？梢�，該發(fā)光光譜與所觀察到的相應(yīng)熒光顏色非常一致（圖3）。加壓引起的FLA-C12、FLA-C5和FLA-C3固體的光譜位移（ΔλPFC=λ加壓-λ退火）分別是40、26和18納米。這意味著，F(xiàn)LA-Cn固體也是鏈長依賴性PFC材料，同時(shí)意味著烷基鏈在調(diào)整FLA-Cn的PFC性能中發(fā)揮了某種功能作用，雖然這樣的烷基元素通常處于非活化狀態(tài)，而且對(duì)光電性能也不利。應(yīng)該注意，F(xiàn)LA-Cn的烷基長度依賴性PFC性能類似于9,10 - 雙（對(duì) - 二烷氧基苯乙烯基）蒽【10I】和β-氰基取代的雙（對(duì) - 烷氧基苯乙烯基）苯【5a】，但完全不同于9,10 - 雙[（N-烷基咔唑-3 - 基）乙烯基]蒽【13】。目前對(duì)于這個(gè)二元烷基鏈長依賴性PFC性能的原因尚不明確，強(qiáng)調(diào)了PFC材料結(jié)構(gòu)與性能關(guān)系的復(fù)雜性。

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2樓2014-10-21 09:48:19

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