Unmodified small-molecule organic light-emitting diodes by blade coating

Yu Fan Chang, Yu Chian Chiu, Han Cheng Yeh, Hao Wen Chang, Chun Yu Chen, Hsin-Fei Meng*, Hao Wu Lin, Heh Lung Huang, Teng Chih Chao, Mei Rurng Tseng, Hsiao-Wen Zan, Sheng Fu Horng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Blade coating with substrate heating and hot wind is demonstrated to be a general platform for multi-layer deposition of unmodified small-molecule organic semiconductors. Most unmodified small molecules, originally designed for vacuum evaporation, can be blade coated while the solubility is above 0.5 wt.%. High uniformity is achieved for scale over 5 cm. Orange devices by evaporation and blade coating are compared with 4,4′-bis(carbazol-9-yl)biphenyl (CBP) as the host, iridium(III) bis(4-(4-t-butylphenyl)thieno[3,2-c]pyridinato-N,C 2′)acetylacetonate (PO-01-TB) as the emitter. The efficiency difference is within 10%. When 2,6-bis(3-(9H-carbazol-9-yl)phenyl)pyridine (26DCzPPy) is used as the host, the current efficiencies are 40 cd/A for orange, 32 cd/A for green, and 20 cd/A for blue. The optimized organic light-emitting diodes (OLED) structure developed for vacuum deposition can therefore be exactly copied by the low cost blade coating method in solution.

Original languageEnglish
Pages (from-to)2149-2155
Number of pages7
JournalOrganic Electronics
Issue number10
StatePublished - 1 Jan 2012


  • Blade coating
  • Organic light-emitting diodes
  • Small-molecule

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