Dae-Gyu Moon

P‐82: Top Emission Organic Light Emitting Diode with Ni Anode

The hole injection and emissive properties of top emission organic light emitting diodes with Nickel anode were investigated. The effect of oxygen plasma treatment on the Ni anodes was also investigated for enhancing the electrical properties of the devices. The device with Ni anode having an high work function shows better hole injection and emission characteristics than that with ITO. Oxygen plasma treatment of Ni anode induced further improvement of electrical properties and surface toughness. CIE coordinates of top emission device were different from bottom emission device. Ni anode induced the internal quantum efficiency of the device to be improved.

29.2: Top Emission Organic EL Display on Paper Substrate

We introduce top emission organic light emitting devices (TEOLEDs) on paper substrate. The Substrate selected was a commercial ink-jet paper. Paper was coated with a polymer to prevent water penetration and out gassing and to improve surface roughness. We studied substrate properties as a function of coating structure and material on paper and fabricated device. It consisted of a metal anode having with work function and a semi-transparent cathode. It shows brightness over 400cd/m2 and working well on the rolled state.

Cavity effect of transparent organic emitting device using metal cathode

We simulated modification of brightness as electrode, ITO anode and semitransparent cathode in the transparent organic light emitting device (TOLED). Semitransparent cathodes were used thin metal films, Ca-Ag and LiF-Al. Ca-Ag electrode has a higher transmittance 71% and lower reflectance 13% as compared to 32% and 24% of LiF-Al at 530nm. Reflectance of these material affected brightness and spectrum. Ratio of emitted lights intensity through ITO and metal cathode was calculated theoretically to use reflectance and transmittance of each electrode. Calculated ratio of brightness is in agreement with the measured ones to each electrode. Brightness of emitted light through ITO is about 3.2 and 1.5 times higher than through LiF-Al and Ca-Ag cathodes, respectively. In case of LiF-Al, ratio of transmitted light through the electrode was very different and spectra of light through LiF-Al were accompanied with the interference fringes.

Characterization of the Multi-Layer Encapsulation of Thin Films on Ethylene Terephthalate (PET)

In this paper, the inorganic-organic thin film encapsulation layer was newly adopted to protect the organic layer from moisture and oxygen. Using the electron beam, sputter and spin-coater system, the various kinds of inorganic and organic thin-films were deposited onto the Ethylene Terephthalate (PET) and their interface properties between organic and inorganic layer were investigated. In this investigation, the SiON and Polyimide (PI) layer showed the most suitable properties Under these conditions, the WVTR for PET can be reduced from a level of 0.57 g/m2/day (bare substrate) to 1*10−5 g/m2/day after application of a SiON and PI layer. These results indicate that the SiON/PI/SiON/PI/PET barrier coatings have high potential for flexible organic light-emitting diode (OLED) applications.

Transparent White OLEDs Using Ca-Ag Cathode

In this paper, we realized a transparent white light emitting device (WOLED) using a single blue emitting layer DPVBi doped with DCJTB. Color turning was done by controlling the thickness of DCJTB doped in DPVBi layer. Transparent electrodes were adapted ITO as anode and Ca-Ag thin layer as cathode. We fabricated transparent WOLED having good color properties, (0.33, 0.30) viewed through Ca-Ag cathode side and (0.36, 0.34) viewed through the ITO anode side, respectively.

P-48: High Transparent Metal Electrode for Flexible Displays

In this study, a high transparent electrode using metal for flexible displays, deposited by the vacuum thermal technique, is investigated. Double layer electrode, consisting of the calcium of 10nm and silver of 10nm, has a high transmittance over 75%, having in addition a low resistance below 12Ω/sq. This deposition process of Ca-Ag thin metal electrode is without any permanent damage to underlying organic layers and strong against any mechanical deformation.