Electrical properties of organic light-emitting diodes using PECCP Langmuir–Blodgett films

Organic light-emitting diodes were fabricated using Langmuir–Blodgett (LB) technique with new emissive organic material. This new emissive organic material was synthesized and called PECCP [poly(3,6- N-2-ethylhexyl carbazolyl cyanoterephthalidene)], which has strong electron donor group and electron...

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Published inThin solid films Vol. 499; no. 1; pp. 402 - 405
Main Authors Lee, Ho Sik, Kim, Doo Seok, Park, Jong Wook, Lee, Won Jae, Jang, Kyung Uk, Kim, Tae Wan, Kwon, Young Soo
Format Journal Article Conference Proceeding
LanguageEnglish
Published Lausanne Elsevier B.V 21.03.2006
Elsevier Science
Subjects
Applied sciences
Electronics
Exact sciences and technology
Langmuir–Blodgett films
OLEDs
Optoelectronic devices
PECCP
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Langmuir–Blodgett films
PECCP
OLEDs
Fowler-Nordheim theory
Voltage current curve
Electrical properties
Solubility
Sandwich structure
Quinoline derivatives
Experimental study
Indium oxide
Light emitting diode
Langmuir-Blodgett films
Tin oxide
Aluminium compound
Langmuir Blodgett layer
Barrier height
Electron donor
Organic compounds
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Summary:Organic light-emitting diodes were fabricated using Langmuir–Blodgett (LB) technique with new emissive organic material. This new emissive organic material was synthesized and called PECCP [poly(3,6- N-2-ethylhexyl carbazolyl cyanoterephthalidene)], which has strong electron donor group and electron acceptor group in main chain repeated unit. This material has good solubility in common organic solvent and has a good stability in air. We made PECCP LB films and investigated current–voltage ( I– V) characteristics in ITO/PECCP LB/Al and ITO/PECCP LB/Alq 3/Al structures, and the Alq 3 was used as an electron transport layer. We have observed that the peak in electroluminescent spectrum of ITO/PECCP LB/Alq 3/Al device shifts to lower wavelength as the number of LB layer increases. The electroluminescent peaks are at about 507 nm, 505 nm, 503 nm, and 491 nm when the number of LB layers are 5, 7, 9, and 11 layers, respectively. From the I– V characteristics, the barrier height was obtained using Fowler–Nordheim analysis and it is in the range of 0.18 eV–0.26 eV.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2005.07.023