https://scholars.lib.ntu.edu.tw/handle/123456789/75028
標題: | Enhanced OLED performance upon photolithographic patterning by using an atomic-layer-deposited buffer layer | 作者: | Chang, Chih-Yu Tsai, Feng-Yu Jhuo, Syue-Jhao Chen, Miin-Jang |
關鍵字: | Atomic layer deposition; Conjugated polymer; Electroluminescence; Photolithography | 公開日期: | 2008 | 卷: | Volume 9 | 期: | Issue 5 | 起(迄)頁: | - | 來源出版物: | Organic Electronics | 摘要: | This study addresses the problem of patterning-induced degradations to organic light-emitting diodes (OLEDs) by using a thin (10 Å) atomic-layer-deposited (ALD) Al2O3 film as both an electron-injection layer and a protecting layer for the electroluminescent material, poly[1-methoxy-4-(2′-ethyl-hexyloxy)-2,5-phenylene vinylene] (MEH-PPV). With the ALD Al2O3 film, the OLEDs not only withstood an aggressive photolithographic patterning process without any degradation but unprecedentedly showed increased luminous efficiency (by 100%) and lowered turn-on voltage (by 19%) afterward. Although the ALD precursor, trimethylaluminum (TMA), was found to damage the MEH-PPV layer through electrophilic addition to the vinylene groups of MEH-PPV during the deposition of the Al2O3 film, its damaging effect was eliminated by pre-treating the MEH-PPV surface with isopropyl alcohol (IPA), whose hydroxyl groups scavenged TMA throughout the ALD process. The performance of the photo-patterned OLEDs was further improved by using a high-conductivity hole-injection layer, which increased accumulation of holes at the EL-buffer interface to enhance electron injection. The method reported herein improves the applicability of photolithography to OLED fabrication, promising to resolve the issue of patterning that has in part impeded OLED's commercialization. © 2008 Elsevier B.V. All rights reserved. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/95641 https://www.scopus.com/inward/record.uri?eid=2-s2.0-49049100430&doi=10.1016%2fj.orgel.2008.04.009&partnerID=40&md5=0738f2e25cf86be572963634dfa11332 |
ISSN: | 15661199 | SDG/關鍵字: | Alumina; Aluminum oxide; Atoms; Charge injection; Conjugated polymers; Electroluminescence; Electron injection; Image enhancement; Organic light emitting diodes (OLED); Photolithography; Atomic layer deposited; Electroluminescent materials; Electron injection layers; Electrophilic additions; Hole injection layers; Induced degradation; Organic light emitting diodes(OLEDs); Photolithographic patterning; Atomic layer deposition |
顯示於: | 材料科學與工程學系 |
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