Title: Continuous blade coating for multi-layer large-area organic light-emitting diode and solar cell
Authors: Chen, Chun-Yu
Chang, Hao-Wen
Chang, Yu-Fan
Chang, Bo-Jie
Lin, Yuan-Sheng
Jian, Pei-Siou
Yeh, Han-Cheng
Chien, Hung-Ta
Chen, En-Chen
Chao, Yu-Chiang
Meng, Hsin-Fei
Zan, Hsiao-Wen
Lin, Hao-Wu
Horng, Sheng-Fu
Cheng, Yen-Ju
Yen, Feng-Wen
Lin, I-Feng
Yang, Hsiu-Yuan
Huang, Kuo-Jui
Tseng, Mei-Rurng
Institute of Lighting and Energy Photonics
Department of Electrophysics
Department of Applied Chemistry
Institute of Physics
Issue Date: 1-Nov-2011
Abstract: 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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3636398]
URI: http://dx.doi.org/10.1063/1.3636398
ISSN: 0021-8979
DOI: 10.1063/1.3636398
Volume: 110
Issue: 9
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