薄膜除潤引起之應力釋放與重組所造成共軛高分子光學行為之變化

由於共軛高分子在主鏈上有非定域化的電子結構，這類電子結構主宰了共軛高分子的光電性質，其基本的光物理機制仍相當複雜未明，因此共軛高分子在薄膜態與液態溶劑中光電性質被廣泛的研究，本文探討激發單分子螢光時間的軌跡。由於MEH-PPV (聚[2-甲氧基-5-(2'乙基己氧基)-1, 4-对苯乙炔]) / PS (聚苯乙烯) 薄膜中，進行除潤後所產生的發光增益，有良好的應用發揮潛力，因此本文進行此實驗，實驗中使用的共軛高分子15%MEH-PPV與85% polystyrene,共同溶於由甲苯，四氫呋喃和環已酮等體積混合之溶劑後，旋塗於矽晶片或玻璃薄片的基材上。高分子薄膜厚度為20nm，當此共軛高分子薄膜進行加熱或溶劑蒸氣退火，高分子薄膜會產生除潤現象，本實驗使用熱退火進行除潤樣品之製作，我們也探討除潤過後的polarization現象和生存時間以及時間頻譜的變化,光譜對除潤造成的影響，實驗觀察中似乎沒有找到極化現象，而從生存時間我們得知樣品生存的快慢:液滴>未除潤>殘留薄膜，這種改進過後的生存時間,顯示除潤可能可以應用在比較長時間的裝置，而這種裝置在有機電子領域佔非常重要的領域，我們開始研究經過photo-bleaching，改變頻譜和photo-bleaching阻力的特性。

關鍵字

除潤；殘留薄膜；未除潤；液滴；螢光漂白

並列摘要

The electronic structure of conjugated polymer chains is non-localized. This electronic structure dominates the optical properties of conjugated polymers. However, the basic photo-physical mechanism is still not clear despite extensive studies of their optical properties in liquid and solid form. This paper discusses a fluorescence time trace under constant excitation of dewetted films of MEH-PPV (poly[2-methoxy, 5-(2'-ethylhexyloxy)-1, 4-phenylenevinylene]) / PS (Polystyrene) Conjugate polymer used in the experiment was 15% MEH-PPV polymer with 85% polystyrene dissolved in equal parts toluene, tetrahydrofuran and cyclohexanone.The sample was spin cast onto a silicon or glass substrate to a thickness of 20nm. Dewetting was carried out using thermal vapor annealing. We investigated the changes of emission polarization, survival time and spectrum across the dewetted sample.We did not find any polarization effect.Concerning survival time fast and slow, we found Droplet> pristine film>residual film. This improved lifetime suggests that dewetting may be useful for making longer lived devices，its effects on device lifetime are of crucial importance in the field of organic electronics，we have investigated both the resistance to photo-bleaching and spectral changes during photo-bleaching

並列關鍵字

non-dewet ； residual film ； dewet ； droplet ； photo-bleaching

參考文獻

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[7] Stefano Sarzi Sartori, Steven De Feyter, Johan Hofkens,Mark Van der Auweraer, Frans De Schryver, Klemens Brunner, Johannes W. Hofstraat, Host Matrix Dependence on the Photophysical Properties of Individual Conjugated Polymer Chains, Macromolecules 36, 500-507 (2003).

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薄膜除潤引起之應力釋放與重組所造成共軛高分子光學行為之變化

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