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Solution processed high efficiency organic light emitting diodes
육경수 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Solution processing is suitable for mass production of large scale organic light emitting diodes(OLEDs) because manufacturing cost is low compare with thermal vacuum evaporation. Solution processed high efficiency OLEDs were reported by using vacuum evaporable materials. Solubility of vacuum evaporable material limits the usage of that material for solution process, because solubility of the materials are very important parameter for solution processed OLEDs. Developments of OLEDs materials are required for high efficiency solution processed OLEDs. In this work, soluble thermally activated delayed fluorescence emitting materials were developed and devices performances were compared according to the fabrication methods, such as spin-coating and thermal vacuum evaporation.
Origin of bistable memory characteristics of organic light-emitting diodes with LiF/Al cathode
육경수,이준엽 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.2
Bistable memory performances of organic light-emitting diodes (OLEDs) with LiF/Al cathode were investigated and the origin of bistability was studied. LiF was essential to get stable memory performances in OLEDs and on/off ratio was improved by more than 50 times by using LiF/Al instead of Al cathode. High on/off ratio over 1000 was obtained from switching test and the multilevel switching of organic light-emitting bistable devices (OLEBDs) was realized by changing the writing voltage of OLEBDs. AlF3 formation at the interface during evaporation of Al was proposed as the main mechanism for bistability of OLEBDs.