Findings from National Formosa University in the Area of Luminescence Described (Blue and white phosphorescent organic light emitting diode performance improvement by confining electrons and holes inside double emitting layers)
By a News Reporter-Staff News Editor at Electronics Newsweekly -- A new study on Luminescence is now available. According to news reporting out of Yunlin, Taiwan, by VerticalNews editors, research stated, "In this research, complex emitting layers (EML) were fabricated using TCTA doping hole-transport material in the front half of a bipolar 26DCzPPy as well as PPT doping electron-transport material in the back half of 26DCzPPy. Blue dopant Flrpic was also mixed inside the complex emitting layer to produce a highly efficient blue phosphorescent organic light emitting diode (OLED)."
Our news journalists obtained a quote from the research from National Formosa University, "The hole and electron injection and carrier recombination rate were effectively increased. The fabricated complex emitting layers exhibited current efficiency of 42 cd/A and power efficiency of 30 lm/W when the luminance was 1000 cd/m(2), driving voltage was 4.4 V, and current density was 2.4 mA/cm(2). A white OLED component was then manufactured by doping red dopant [0s(bpftz)(2)(PPh2Me)(2)] (Os) in proper locations. When the Os dopant was doped in between the complex emitting layers, excitons were effectively confined within, increasing the recombination rate and therefore reducing the color shift. The resulting Commission Internationale de L'Eclairage (CIE) coordinates shifted from 4 to 10 V is (Delta x = -0.04, Delta y = +0.01)."
According to the news editors, the research concluded: "The component had a current efficiency of 35.7 cd/A, a power efficiency of 24 lm/W, driving voltage of 4.6 V and a ClExy of (0.31,0.35) at a luminance of 1000 cd/m(2), with a maximum luminance of 15,600 cd/m(2) at 10 V. Attaching an outcoupling enhancement film was applied to increase the luminance efficiency to 30 lm/W."
For more information on this research see: Blue and white phosphorescent organic light emitting diode performance improvement by confining electrons and holes inside double emitting layers. Journal of Luminescence, 2014;153():312-316. Journal of Luminescence can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Journal of Luminescence - www.elsevier.com/wps/product/cws_home/505700)
Our news journalists report that additional information may be obtained by contacting Y.S. Tsai, Natl Formosa Univ, Inst Electroopt & Mat Sci, Yunlin 63201, Taiwan. Additional authors for this research include L.A. Hong, F.S. Juang and C.Y. Chen.
Keywords for this news article include: Asia, Yunlin, Taiwan, Electronics, Luminescence, Light-emitting Diode
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