Title: Unmodified small-molecule organic light-emitting diodes by blade coating
Authors: Chang, Yu-Fan
Chiu, Yu-Chian
Yeh, Han-Cheng
Chang, Hao-Wen
Chen, Chun-Yu
Meng, Hsin-Fei
Lin, Hao-Wu
Huang, Heh-Lung
Chao, Teng-Chih
Tseng, Mei-Rurng
Zan, Hsiao-Wen
Horng, Sheng-Fu
Department of Electrophysics
Institute of Physics
Department of Photonics
Keywords: Organic light-emitting diodes;Small-molecule;Blade coating
Issue Date: 1-Oct-2012
Abstract: 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. (C) 2012 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.orgel.2012.05.017
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2012.05.017
Volume: 13
Issue: 10
Begin Page: 2149
End Page: 2155
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