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Organic White Light-Emitting Diodes Using a New DCM Derivative as an Orange-Red Doping Molecule

Cited 8 time in Web of Science Cited 8 time in Scopus
Authors
Hwang, Do-Hoon; Lee, Jong-Don; Cho, Nam Sung; Lee, Sang Kyu; Cho, Hoon-Je; Shim, Hong-Ku; Lee, Changhee; Park, Moo-Jin
Issue Date
2008
Publisher
Elsevier
Citation
Synth. Met. 158 (2008) 802
Keywords
Organic white light-emitting diodeDCM derivativeOrganic semiconductor
Abstract
A new DCM derivative containing a phenothiazine moiety, 4-(dicyanomethylene)-2-t-butyl-6-(9-ethylphenothiazine-2-enyl)-4H-pyran (DCPTZ), has been synthesized for use 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 light-emitting devices with the structure ITO/PEDOT-PSS/α-NPD/α-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.
ISSN
0379-6779
Language
English
URI
http://hdl.handle.net/10371/13652
DOI
https://doi.org/10.1016/j.synthmet.2008.05.005
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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