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yhc0316銀蟲 (初入文壇)
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Another interesting phenomenon is the PFC behaviour of pure FLA-C12 solid. Just ground FLA-C12 solid emits yellow fluorescence, however, when it is left standing at room temperature, the fluorescence colour changes with the increase of standing time and gradually recovers to the original green emission (Fig. 5, top). The lower part of Fig. 5 is the change curve of the peak emission wavelength of ground FLA-C12 solid versus the standing time. It is shown that the rapid recovering in uorescence colour and emission happens within the initial 10 min (form 553 to 522 nm), and standing for 60 min, the fluorescence emission (515 nm) is almost identical with the pristine solid (514 nm) and almost unchanged further. In view of the changes in fluorescence colour and emission spectra, grinding has the same effect as pressing. On the other hand, unlike FLAC12, the fluorescence colours and emission spectra of ground FLA-C3 and FLA-C5 solids remain orange and yellow over 24 h at room temperature. These findings suggest that we can endow 9,10-diarylvinyl-anthracene dyes with stable or self-recovering PFC behaviour by altering the end-arylenes and tuning the alkyl length. PFC materials with tunable recovering behaviour could be useful for various applications. |
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真強(qiáng)必勝: 金幣+2, 謝謝 2014-10-21 14:26:26
yhc0316: 金幣+35, 翻譯EPI+1 2014-10-21 18:21:51
真強(qiáng)必勝: 金幣+2, 謝謝 2014-10-21 14:26:26
yhc0316: 金幣+35, 翻譯EPI+1 2014-10-21 18:21:51
| 另一個(gè)有趣的現(xiàn)象是純FLA-C12固體的PFC性能。只有研磨FLA-C12固體發(fā)黃色熒光，但當(dāng)它被放置在室溫下，隨靜置時(shí)間的增加，熒光顏色發(fā)生變化并逐漸恢復(fù)到原來(lái)的綠色發(fā)光（圖5，上半部分）。圖5的下部是研磨FLA-C12固體的峰值發(fā)光波長(zhǎng)與靜置時(shí)間的變化曲線。結(jié)果顯示，熒光顏色和發(fā)光在最初的10分鐘內(nèi)快速恢復(fù)（從553至522納米），靜置60分鐘后，熒光發(fā)光（515納米）與原始固體（514納米）幾乎相同，而且?guī)缀鯖]有進(jìn)一步變化。鑒于熒光顏色和發(fā)光光譜的變化，研磨和加壓具有相同的效果。另一方面，不同于FLAC12，研磨FLA-C3和FLA-C5固體的熒光顏色和發(fā)光光譜在室溫下保持橙色和黃色超過(guò)24小時(shí)以上。這些結(jié)果表明，我們可以通過(guò)改變末端亞芳基和調(diào)節(jié)烷基長(zhǎng)度使9,10 - 二芳基乙烯基蒽染料具有穩(wěn)定或自恢復(fù)PFC性能。具有可調(diào)恢復(fù)性能的PFC材料對(duì)各種應(yīng)用是有用的。 |
2樓2014-10-21 11:06:04
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