Electrical Properties of Organic Light-Emitting Diodes with an Insertion of CMTS Self-Assembled Monolayers
- Authors
- Na, Su Hwan; Mok, Rang Kyun; Lee, Won Jae; Song, Min Jong; Kim, Tae Wan
- Issue Date
- 2010
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- Fowler-nordheim tunneling; ITO; organic light-emitting diodes; self-assembled monolayer
- Citation
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.520, pp.325 - 330
- Journal Title
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS
- Volume
- 520
- Start Page
- 325
- End Page
- 330
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/21697
- DOI
- 10.1080/15421401003608436
- ISSN
- 1542-1406
- Abstract
- Electrical properties of organic light-emitting diodes were studied in a device with an insertion of chloromethyl-trichlorosilane self-assembled monolayer (SAM) between the ITO anode and organic layer. Self-assembled monolayer is generally used for a surface reformation of ITO substrate to enhance the charge injection at the anode/organic interface. For a formation of SAM onto the ITO anode, the ITO substrate was immersed in a 20mM solution of SAM material. SAM-treatment time on the ITO substrate was varied to be 0, 10, 15, 20, and 25 minutes. And then, the device was made in a structure of ITO(170 nm)/SAM/TPD(50 nm)/Alq(3)(70 nm)/LiF(0.5 nm)/Al(100 nm). A device with properly treated self-assembled monolayer at the anode/organic interface gives an improvement in turn-on voltage, luminance, and efficiency compared to the one without SAM layer. A current efficiency and an external quantum efficiency of the device with 15 minutes treated SAM layer were increased by 2.6 times compared to the ones without the SAM layer. Fowler-Nordheim tunneling conduction mechanism was applied to the current density-voltage characteristics to obtain a hole injection barrier height. It was found that there is a reduction in barrier height by 25% for the device with 15 minutes SAM-treated compared to the one without SAM-treated.
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