17 September 2002 Influence of the hole-blocking materials on the luminous properties of highly efficient blue organic light-emitting diodes
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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.
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Ching-Wu Wang, Sung-Tzer Yang, Wen-Fa Kuo, "Influence of the hole-blocking materials on the luminous properties of highly efficient blue organic light-emitting diodes", Proc. SPIE 4918, Materials, Devices, and Systems for Display and Lighting, (17 September 2002); doi: 10.1117/12.483069; https://doi.org/10.1117/12.483069
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