Characteristics of Solution-Processed Small-Molecule Organic Films and Light-Emitting Diodes Compared with their Vacuum-Deposited Counterparts
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SCOPUS
- Title
- Characteristics of Solution-Processed Small-Molecule Organic Films and Light-Emitting Diodes Compared with their Vacuum-Deposited Counterparts
- Authors
- Lee, TW; Noh, T; Shin, HW; Kwon, O; Park, JJ; Choi, BK; Kim, MS; Shin, DW; Kim, YR
- Date Issued
- 2009-05-22
- Publisher
- WILEY-V C H VERLAG GMBH
- Abstract
- Although significant progress has been made in the development of vacuum-deposited small-molecule organic light-emitting diodes (OLEDs) one of the most desired research goals is still to produce flexible displays by low-cost solution processing. The development of solution-processed OLEDs based on small molecules could potentially be a good approach but no intensive studies on this topic have been conducted so far. To fabricate high-performance devices based on solution-processed small molecules, the underlying nature of the produced films and devices must be elucidated. Here, the distinctive characteristics of solution-processed small-molecule films and devices compared to their vacuum-deposited counterparts are reported. Solution-processed blue OLEDs show a very high luminous efficiency (of about 8.9cd A(-1)) despite their simplified structure. A better hole-blocking and electron-transporting layer is essential for achieving high-efficiency solution-processed devices because the solution-processed emitting layer gives the devices a better hole-transporting capability and more electron traps than the vacuum-deposited layer. It is found that the lower density of the solution-processed films (compared to the vacuum-deposited films) can be a major cause for the short lifetimes observed for the corresponding devices.
- Keywords
- TRANSPORT
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/28232
- DOI
- 10.1002/ADFM.2008010
- ISSN
- 1616-301X
- Article Type
- Article
- Citation
- ADVANCED FUNCTIONAL MATERIALS, vol. 19, no. 10, page. 1625 - 1630, 2009-05-22
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