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Jpn. J. Appl. Phys. 39 (2000) pp. L942-L944  |Next Article|  |Table of Contents|
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Letter

Organic Light-Emitting Devices Patterned by Screen-Printing

Kentaro Mori, TaiLu Ning¹, Musubu Ichikawa, Toshiki Koyama and Yoshio Taniguchi

Department of Functional Polymer Science, Shinshu University, 3-15-1 Tokita, Ueda, Nagano 386-8567, Japan
¹Fuji Name Plate Co., Ltd., 3884-1 Kanazawa-yanokuchi, Chino, Nagano 391-0012, Japan

(Received June 29, 2000; accepted for publication July 21, 2000)

We have demonstrated a patterned organic light-emitting device fabricated by screen-printing on the basis of the doped hole-transport layer (DHTL) which is our novel concept. The DHTL, which consisted of a polymeric compound of N,N^′-diphenyl-N,N^′-bis(3-methylphenyl)-1,1^′-biphenyl-4,4^′-diamine (P-TPD) as a hole-transport material and tris (4-bromophenyl) aminium hexachloroantimonate (TBAHA) as an electron-accepting dopant, was patterned by screen-printing. The luminous area of the device was restricted to the DHTL-printed area. The device was operated at approximately 5 V, and a luminance of 4800 cd/m² was obtained at a current density of 150 mA/cm². The appropriate concentration of P-TPD was 80 g/l in dichlorobenzene, at which a smooth and pinhole-less layer was obtained with a thickness of 0.5 µm. The suitable concentration of TBAHA in P-TPD was approximately 8 wt%.

URL: http://jjap.jsap.jp/link?JJAP/39/L942/
DOI: 10.1143/JJAP.39.L942
KEYWORDS:screen-printing, patterning, organic light-emitting diode, doped organic light-emitting diode, doped hole-transport layer

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