Characteristics of solution-processed small-molecule organic films and light-emitting diodes compared with their vacuum-deposited counterparts

Tae Woo Lee, Taeyong Noh, Hee Won Shin, Ohyun Kwon, Jong Jin Park, Byoung Ki Choi, Myeong Suk Kim, Dong Woo Shin, Yong Rok Kim

Research output: Contribution to journalArticle

120 Citations (Scopus)

Abstract

Although significant progress has been made in the development of vacuumdeposited 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. Solutionprocessed blue OLEDs show a very high luminous efficiency (of about 8.9 cd A-1) despite their simplified structure. A better hole-blocking and electron-transporting layer is essential for achieving high-efficiency solutionprocessed 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 solutionprocessed films (compared to the vacuum-deposited films) can be a major cause for the short lifetimes observed for the corresponding devices.

Original languageEnglish
Pages (from-to)1625-1630
Number of pages6
JournalAdvanced Functional Materials
Volume19
Issue number10
DOIs
Publication statusPublished - 2009 May 22

Fingerprint

Light emitting diodes
light emitting diodes
Vacuum
Organic light emitting diodes (OLED)
vacuum
Molecules
molecules
Flexible displays
Electron traps
electrons
traps
Electrons
life (durability)
Processing
causes
Costs

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Lee, Tae Woo ; Noh, Taeyong ; Shin, Hee Won ; Kwon, Ohyun ; Park, Jong Jin ; Choi, Byoung Ki ; Kim, Myeong Suk ; Shin, Dong Woo ; Kim, Yong Rok. / Characteristics of solution-processed small-molecule organic films and light-emitting diodes compared with their vacuum-deposited counterparts. In: Advanced Functional Materials. 2009 ; Vol. 19, No. 10. pp. 1625-1630.
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Characteristics of solution-processed small-molecule organic films and light-emitting diodes compared with their vacuum-deposited counterparts. / Lee, Tae Woo; Noh, Taeyong; Shin, Hee Won; Kwon, Ohyun; Park, Jong Jin; Choi, Byoung Ki; Kim, Myeong Suk; Shin, Dong Woo; Kim, Yong Rok.

In: Advanced Functional Materials, Vol. 19, No. 10, 22.05.2009, p. 1625-1630.

Research output: Contribution to journalArticle

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