Preparation and characterization of white phosphorescence polymer light emitting diodes

Hak Min Lee; Su Choel Gong; Chang Duk Jun; Jin Eun Choi; Young Chul Chang; Ho Jung Chang

doi:10.1117/12.827451

27 August 2009 Preparation and characterization of white phosphorescence polymer light emitting diodes

Hak Min Lee, Su Choel Gong, Chang Duk Jun, Jin Eun Choi, Young Chul Chang, Ho Jung Chang

Proceedings Volume 7415, Organic Light Emitting Materials and Devices XIII; 74151Z (2009) https://doi.org/10.1117/12.827451
Event: SPIE Photonic Devices + Applications, 2009, San Diego, California, United States

Abstract

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); https://doi.org/10.1117/12.827451

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KEYWORDS

Organic light emitting diodes

Phosphorescence

Polymers

Light emitting diodes

Doping

Optical properties

Absorption

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