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Proceedings Paper

Influence of the hole-blocking materials on the luminous properties of highly efficient blue organic light-emitting diodes
Author(s): Ching-Wu Wang; Sung-Tzer Yang; Wen-Fa Kuo
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Paper Abstract

Blue organic light emitting diodes of a multi-layered strcutre were fabricated and their device performance were investigated. N, N'-bis-N, N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB) is hole transport and blue light emitter material. We have built some multi-layer structures with hole-blocking layer (HBL). The HBL is inserted betwen the hole transport layer (HTL) and electron transport layer (ETL) to confine the charge recombination in hole-transporting layer. Three different hole-blocking materials, inclduigns BCP, TAZ, and PBD were adopted for comparison. Evidence showed that the BCP hole-blocking material possessed both the superior J-V and L-J characteristics. The superio J-V characteristics was suggested to be due to the BCP film possesign flatter surface morphology. The superior L-J characteristic was deduced to be due to the BCP possessed the smaller barrier height at NPB/BCP for electrons and/or the flatter surface morphology.

Paper Details

Date Published: 17 September 2002
PDF: 9 pages
Proc. SPIE 4918, Materials, Devices, and Systems for Display and Lighting, (17 September 2002); doi: 10.1117/12.483069
Show Author Affiliations
Ching-Wu Wang, I-Shou Univ. (Taiwan)
Sung-Tzer Yang, I-Shou Univ. (Taiwan)
Wen-Fa Kuo, LX OT Technology Co., Ltd. (Taiwan)

Published in SPIE Proceedings Vol. 4918:
Materials, Devices, and Systems for Display and Lighting
Fuxi Gan; Ming Hsien Wu; Lionel C. Kimerling, Editor(s)

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