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Proceedings Paper

Organic white light-emitting diodes using a new DCM derivative as a doping molecule
Author(s): Do-Hoon Hwang; Jong-Don Lee; Hoon-Je Cho; Nam Sung Cho; Sang Kyu Lee; Hong-Ku Shim; Changhee Lee
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Paper Abstract

A new DCM derivative 4-(dicyanomethylene)-2-t-butyl-6-(9-ethylphenothiazine-2-enyl)-4H-pyran (DCPTZ) has been used as an orange-red fluorescent dye molecule in organic light-emitting diodes (OLEDs). EL devices with the structure ITO/PEDOT-PSS/α-NPD/Alq3:DCPTZ/Alq3/LiF/Al were fabricated with various DCPTZ doping concentrations. The maxima in the EL spectra of the devices varied from 580 to 620 nm depending on the doping concentration of the dye molecule. An EL device with 0.5% dopant concentration was found to exhibit a maximum brightness of 81,500 cd/m2 at 13.3 V and a power efficiency of 4.1 lm/W with CIE coordinates (0.51, 0.47) at a luminance of 100 cd/m2. White lightemitting devices with the structure ITO/PEDOT-PSS/a-NPD/a-NPD:DCPTZ/DPVBi/Alq3/ LiF/Al were also fabricated. The thickness of the blue light-emitting 1,4-bis(2,2-diphenylvinyl)benzene (DPVBi) layer was varied to obtain white light emission. White light emission from the device was observed when the thickness of the DPVBi layer was greater than 10 nm. The maximum brightness and power efficiency of the device with a 20 nm DPVBi layer were found to be 30,300 cd/m2 and 2.0 lm/W respectively, with CIE coordinates (0.33, 0.36). In addition, the white EL device exhibits a relatively high color rendering index (CRI) of about 83.

Paper Details

Date Published: 20 November 2007
PDF: 7 pages
Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 68280B (20 November 2007); doi: 10.1117/12.771033
Show Author Affiliations
Do-Hoon Hwang, Kumoh National Institute of Technology (South Korea)
Jong-Don Lee, Kumoh National Institute of Technology (South Korea)
Hoon-Je Cho, Korea Advanced Institute of Science and Technology (South Korea)
Nam Sung Cho, Korea Advanced Institute of Science and Technology (South Korea)
Sang Kyu Lee, Korea Advanced Institute of Science and Technology (South Korea)
Hong-Ku Shim, Korea Advanced Institute of Science and Technology (South Korea)
Changhee Lee, Seoul National Univ. (South Korea)


Published in SPIE Proceedings Vol. 6828:
Light-Emitting Diode Materials and Devices II
Jian Wang; Changhee Lee; Hezhou Wang, Editor(s)

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