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Proceedings Paper

White organic light-emitting diodes with high efficiency and stable color coordinates
Author(s): Chang Hee Lee; Nam Heon Lee; Jun-Ho Song; Do Hoon Hwang
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Paper Abstract

We report the fabrication and the characterization of white organic light-emitting diodes that exhibit high efficiency and very stable color coordinates over the wide range of bias voltages. The blue-emitting layer of 1,4-bis(2,2-diphenyl vinyl)benzene (DPVBi) is sandwiched between the red-emitting layers in which red fluorescent dyes of 4-dicyanomethylene-2-methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-benzo[i,j]quinolizin-8-yl)vinyl]-4H-pyran) (DCM2) are doped into the hole-transporting layer of 4,4’bis[N-(1-napthyl)-N-phenyl-amino]-biphenyl (α-NPD) and the electron-transporting layer of tris(8-hydroxyquinoline) aluminum (Alq3). The device structure is ITO/PEDOT:PSS/α-NPD(50 nm)/α-NPD:DCM2 (5 nm, 0.2 %)/DPVBi(10 nm)/Alq3:DCM2(5 nm, 0.2 %)/Alq3(40 nm)/LiF(0.5 nm)/Al. The partial energy transfer from the blue layer to the nearby red layers results in white light emission with the stable color coordinates of (0.36, 0.37). The device shows the luminous efficiency of about 3.6 lm/W at 100 cd/m2 and the maximum luminance of 40,650 cd/m2 at the bias of 12 V.

Paper Details

Date Published: 20 October 2004
PDF: 8 pages
Proc. SPIE 5530, Fourth International Conference on Solid State Lighting, (20 October 2004); doi: 10.1117/12.565386
Show Author Affiliations
Chang Hee Lee, Seoul National Univ. (South Korea)
Nam Heon Lee, Inha Univ. (South Korea)
Jun-Ho Song, Inha Univ. (South Korea)
Do Hoon Hwang, Kumoh National Institute of Technology (South Korea)

Published in SPIE Proceedings Vol. 5530:
Fourth International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Steven P. DenBaars; John C. Carrano, Editor(s)

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