News Column

Reports from Electronics and Telecommunications Research Institute Advance Knowledge in Applied Physics

June 10, 2014

By a News Reporter-Staff News Editor at Physics Week -- Current study results on Applied Physics have been published. According to news originating from Taejon, South Korea, by VerticalNews correspondents, research stated, "We report highly efficient all phosphorescent white organic light-emitting diodes (OLEDs) with an exciton-confinement structure. By stacking two emissive layers (EMLs) with different charge transporting properties, effective charges as well as exciton confinements were achieved."

Our news journalists obtained a quote from the research from Electronics and Telecommunications Research Institute, "Accordingly, efficient blue OLEDs with a peak external quantum efficiency (EQE) over 22% and power efficacy (PE) over 50 lm/W were developed by using iridium(III) bis(4,6-(difluorophenyl) pyridinato-N,C2')picolinate (FIrpic) as an electro-phosphorescent dopant. When the optimized orange and red EMLs were sandwiched between the stacked two blue EMLs, white OLEDs with an EQE and PE of 24.3% and 45.9 lm/W at a luminance of 1000 cd/m(2) were obtained without the use of any out-coupling techniques."

According to the news editors, the research concluded: "In addition, these white OLEDs exhibit a color rendering index (CRI) value of 84 with high efficacy."

For more information on this research see: Highly efficient all phosphorescent white organic light-emitting diodes for solid state lighting applications. Current Applied Physics, 2014;14():S84-S87. Current Applied Physics can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier -; Current Applied Physics -

The news correspondents report that additional information may be obtained from J. Lee, ETRI, OLED Res Center, Taejon 305350, South Korea. Additional authors for this research include J.W. Lee, N.S. Cho, J. Hwang, C.W. Joo, W.J. Sung, H.Y. Chu and J.I. Lee.

Keywords for this news article include: Asia, Taejon, South Korea, Applied Physics

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Source: Physics Week

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