The highly branched hyperbranched polymers (HBPs) possess large inner space among the irregular branches and the inter-chain contacts inside the globular HBPs can be greatly inhibited. With the unique structural features, HBPs have good solubility in common organic solvent and reduced possibility to form excimer and aggregated species. On the other hand, the wholly aromatic polyquinolines are reported to have excellent thermal and oxidative stability. With the above superior properties, HBPs and polyquinolines are commonly used as emitting materials in light-emitting diodes (LEDs). Therefore, quinioline moiety was implanted into HBPS in this study to prepare materials with superior properties to be used in LED pplications.
Four polyquinoline HBPs with different branching densities (designated as HBP-1 to -4 from low to high densities) were prepared and their optical, thermal, electrochemical properties and device performance were measured and analyzed. The rigid, wholly heterocyclic polyquinolines HBPs have excellent thermal stability with a high Tg (> 245 ¢J) and high decomposition temperature starting at 571 ¢J. The solution and the solid samples have similar UV-vis absorption and PL emission spectra. The resultant samples have high quantum efficiencies with the measured values ranged from 0.68 to 0.74. Most importantly, thermal annealing at high temperatures (> 200 ¢J) resulted in no changes on the corresponding photoluminescent and electroluminescent emission spectra, which indicates the high thermal and spectral stabilities of all HBP polyquinolines in this study.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0717111-163354 |
| Date | 17 July 2011 |
| Creators | Tsai, Ya-ting |
| Contributors | ming. chen, j. l. hong, s. w. kuo, y. w. chiang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0717111-163354 |
| Rights | not_available, Copyright information available at source archive |
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