Pan Pacific Symposium Conference Proceedings


EFFICIENCY IMPROVEMENT OF BLUE ORGANIC LIGHT EMITTING DIODES WITH NANOSCALE DISPERSING EMISSION ZONE LAYERS

Author: Shih-Ching Lin et al.
Company: I-Shou University
Date Published: 2/10/2004   Conference: Pan Pacific Symposium


Abstract: A blue organic light emitting diode (OLED) with a dispersing emission zone layer(DEZL) has been prepared. The DEZL is constructed by N,N'-bis(l-naphthyl)-N,N'-diphenyl-l ,l'biphenyl4, 4'-diamine (NPB)/ 4, 4', 4''- tris[3-methylphenyl(phenyl)amino] triphenylamine (MTDATA)]n. The effect of DEZL thickness and layer number (n) upon the device performance has also been studided.

We have found the optimum NPB and MTDATA thickness of dispersing emission region layers are 50Å and 100Å respectively, and layer number is three. The emission peak is the same as conventional devices at 425nm. The luminance efficiency is 1.6 times the conventional devices. The blue OLEDs with DEZL possess a better performance than the conventional blue OLEDs, we attributed it to the dispersing effect of the dispersing emission region layer structure.

Key words: OLED, luminance efficiency.



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