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27 August 2009 Preparation and characterization of white phosphorescence polymer light emitting diodes
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The phosphorescence polymer LEDs (PhPLEDs) with the structure of ITO/PEDOT:PSS/PVK:Ir(ppy)3: PFO:Ir(pq)2acac/TPBI/LiF/Al were fabricated to investigate the effect of doping concentrations on the electrical and optical properties of PhPLEDs. The PVK(poly-vinylcarbazole) and Ir(ppy)3[tris(2-phenylpyridine)iridium(III)] polymers were used as the host and guest materials. The PFO[poly(9,9-dioctylfluorene)] and Ir(pq)2(acac) [bis(2-phenyl-1-quinoline)iridiumacety lacetonate] were also introduced as other guest materials for the white emission. The Ir(pq)2acac concentrations was changed ranging from 1.0 to 5.0 volume % (vol %) in the emission layer. The concentration of PVK:Ir(ppy)3:PFO was fixed with 100:2.0:1.0 in vol %, respectively. The white PhPLEDs were obtained for the samples with 5.0 vol % of Ir(pq)2acac material and the maximum luminance was found to be 2430 cd/m2. The CIE color coordinators were ranged with x, y = 0.32~0.33, 0.33~0.34 at 8V, showing good white color.
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Hak Min Lee, Su Choel Gong, Chang Duk Jun, Jin Eun Choi, Young Chul Chang, and Ho Jung Chang "Preparation and characterization of white phosphorescence polymer light emitting diodes", Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74151Z (27 August 2009);

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