Continuous blade coating for multi-layer large-area organic light-emitting diode and solar cell

Chun Yu Chen, Hao Wen Chang, Yu Fan Chang, Bo Jie Chang, Yuan Sheng Lin, Pei Siou Jian, Han Cheng Yeh, Hung Ta Chien, En Chen Chen, Yu Chiang Chao, Hsin Fei Meng*, Hsiao Wen Zan, Hao Wu Lin, Sheng Fu Horng, Yen Ju Cheng, Feng Wen Yen, I. Feng Lin, Hsiu Yuan Yang, Kuo Jui Huang, Mei Rurng Tseng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)


A continuous roll-to-roll compatible blade-coating method for multi-layers of general organic semiconductors is developed. Dissolution of the underlying film during coating is prevented by simultaneously applying heating from the bottom and gentle hot wind from the top. The solvent is immediately expelled and reflow inhibited. This method succeeds for polymers and small molecules. Uniformity is within 10 for 5 cm by 5 cm area with a mean value of tens of nanometers for both organic light-emitting diode (OLED) and solar cell structure with little material waste. For phosphorescent OLED 25 cd/A is achieved for green, 15 cd/A for orange, and 8 cd/A for blue. For fluorescent OLED 4.3 cd/A is achieved for blue, 9 cd/A for orange, and 6.9 cd/A for white. For OLED with 2 cm by 3 cm active area, the luminance variation is within 10. Power conversion efficiency of 4.1 is achieved for polymer solar cell, similar to spin coating using the same materials. Very-low-cost and high-throughput fabrication of efficient organic devices is realized by the continuous blade-only method.

Original languageEnglish
Article number094501
JournalJournal of Applied Physics
Issue number9
Publication statusPublished - 2011 Nov 1
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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