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Optical Engineering

Preparation and characterization of phosphorescence organic light-emitting diodes using poly-vinylcarbazole: tris(2-phenylpyridine) iridium(III) emission layer
Author(s): 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
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Paper 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.

Paper Details

Date Published: 1 October 2009
PDF: 6 pages
Opt. Eng. 48(10) 104001 doi: 10.1117/1.3251325
Published in: Optical Engineering Volume 48, Issue 10
Show Author Affiliations
Hak Min Lee, Dankook Univ. (Korea, Republic of)
Seung Jun Baek, Dankook Univ. (Korea, Republic of)
Su Cheol Gong, Dankook Univ. (Korea, Republic of)
Chang Duk Jeon, Dankook Univ. (Korea, Republic of)
Jin Eun Choi, Dankook Univ. (Korea, Republic of)
Hyung Ho Park, Yonsei Univ. (Korea, Republic of)
Hyeongtag Jeon, Hanyang Univ. (Korea, Republic of)
Young Chul Chang, Korea Univ. of Technology and Education (Korea, Republic of)
Ho Jung Chang, Dankook Univ. (Korea, Republic of)

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