• JSTS:Journal of Semiconductor Technology and Science
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• v.14 no.1
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• pp.23-28
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• 2014

In this paper, we discuss on the optimal design scheme of the bilayer OLED (Organic Light Emitting Diodes) with micro-cavity structure. We carried out the optical simulation on the OLED device and calculated optimal scale of devices with taking the micro-cavity effect into account. Our emission model is based upon an ensemble of radiating dipole antennas. Consequently, we applied Maxwell's equation to this sequence, followed by the analysis on the electrical behaviors of OLED device using Poisson's equation. It contains carrier injection and transportation mechanism. In this process, we found out the thickness of each layer can affect the recombination rate at the emission layer. Therefore, we optimized the thickness of each layer to improve the efficiency of the device.

• Journal of the Korean Graphic Arts Communication Society
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• v.23 no.1
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• pp.77-97
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• 2005

Organic light-emitting diodes(OLEDs) have received considerable attention since they were first reported by Tang. Novel organic fluorescent materials have been reported on synthesis and application of new organic light-emitting materials. Despite of much recent progress, fabrication of full-color OLEDs still remained to be done. Many method have been proposed to full-color OLEDs displays such as using separated red, green and blue emitters, stacking separate rad, green and blue emitter, using a white emitter with individually pattered color filters, microcavity structures and using a blue emitter with individually patterned fluorescent materials. The last method has much attention because of easy fabrication of OLEDs and low-priced fabrication. This paper reports the optical and electrical characteristics of OLEDs using novel molecules containing biphenyl structure. Optical properties of biphenyl derivatives doped with poly(9-vinyl carbazole)(PVK) are measured and found Forster energy transfer process in the blends. And devices were fabricated as ITO/PEDOT/PVK doped with biphenyl derivatives/$Alq_3$/Li:Al and I-V-L characteristics and EL efficiency of devices were examined.