1 October 2009 Preparation and characterization of phosphorescence organic light-emitting diodes using poly-vinylcarbazole: tris(2-phenylpyridine) iridium(III) emission layer
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Abstract
An emission layer with the poly-vinylcarbazole (PVK) and Ir(ppy)3[tris(2-phenylpyridine)iridium(III)] as the host and guest materials, respectively, was prepared on a PEDOT:PSS/ITO substrate. TPBI [2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole)] was introduced to improve the light efficiency of the devices. Green phosphorescence polymer LEDs with the structure ITO/PEDOT:PSS/PVK:Ir(ppy)3/TPBI/LiF/Al were fabricated and their electrical and optical properties investigated at various doping concentrations (0.5 wt % to 2.5 wt %) of Ir(ppy)3. The maximum luminance and current density were about 8600 cd/m2 and 155 mA/cm2 at 7 V, respectively, when the TPBI layer was introduced between the emission layer and cathode electrode film. The emission spectrum and Commission International d'Eclairage (CIE) color coordinates were about 512 nm and (x,y=0.27 to 0.28, 0.61 to 0.63), respectively, showing a green color.
© (2009) Society of Photo-Optical Instrumentation Engineers (SPIE)
Hak Min Lee, Seung Jun Baek, Su Cheol Gong, Chang Duk Jeon, Jin Eun Choi, Hyung Ho Park, Hyeongtag Jeon, Young Chul Chang, Ho Jung Chang, "Preparation and characterization of phosphorescence organic light-emitting diodes using poly-vinylcarbazole: tris(2-phenylpyridine) iridium(III) emission layer," Optical Engineering 48(10), 104001 (1 October 2009). https://doi.org/10.1117/1.3251325 . Submission:
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