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Chin, Byung-Doo,Suh, Min-Chul,Kim, Mu-Hyun,Kang, Tae-Min,Yang, Nam-Choul,Song, Myung-Won,Lee, Seong-Taek,Kwon, Jang-Hyuk,Chung, Ho-Kyoon,Wolk, Martin B.,Bellmann, Erika,Baetzold, John P. The Korean Infomation Display Society 2003 Journal of information display Vol.4 No.3
Laser-Induced Thermal Imaging (LITI) is a laser addressed patterning process and has unique advantages such as high-resolution patterning with over all position accuracy of the imaged stripes of within 2.5 micrometer and scalability to large-size mother glass. This accuracy is accomplished by real-time error correction and a high-resolution stage control system that includes laser interferometers. Here the new concept of hybrid system that complement the merits of small molecule and polymer to be used as an OLED; our system can realize easy processing of light emitting polymers and high luminance efficiency of small molecules. LITI process enables the stripes to be patlerned with excellent thickness uniformity and multi-stacking of various functional layers without having to use any type of fine metal shadow mask. In this study, we report a full-color hybrid OLED using the multi-layered structure consisting of small molecules and polymers.
Chin, Byung Doo,Kim, Jai Kyeong,Park, O Ok Institute of Physics [etc.] 2007 Journal of Physics. D, Applied Physics Vol.40 No.15
<P>In this work, we fabricated white organic light-emitting devices (WOLEDs) containing a layered light-emitting region composed of a single blue-emitting host and different fluorescent dopant materials. The effects of varying the dye-doping ratio and emitting layer thickness on the efficiency, lifetime, spectral voltage-dependence and white balance were investigated for devices with a blue/orange stacked layer structure. Addition of a blue host layer doped with a green-emitting dopant, to give a blue/green/orange emitter, resulted in a broadband white spectrum without the need for a charge-blocking interlayer. The composition of blue, green and orange dopants in the host and the thickness of each emitting layer were optimized, resulting in a device efficiency of 9–11 cd A<SUP>−1</SUP> even at a high brightness of 10 000 cd m<SUP>−2</SUP> (achieved at a bias voltage of less than 9 V) with an emission spectrum suitable for lighting applications.</P>
Institute of Physics [etc.] 2007 Journal of Physics. D, Applied Physics Vol.40 No.18
<P>The design and preparation of top-emitting organic light emitting devices with thick hole transport layers that effectively smooth the substrate were performed. Bilayer transfer with laser thermal patterning method was used to simplify the fabrication of hole transport layers with various thicknesses, with the aim of optimizing the cavity effect in the top-emitting devices. By carrying out optical simulations and experiments, the optimal thicknesses of the hole transport layers for our structure of blue, green and red devices were found to be 140 nm, 160 nm and 230 nm, respectively. We have briefly illustrated the underlying device physics of top-emission in terms of the resonance and microcavity effect. The resulting top-emitting devices with thick hole transport layers exhibit better colour purity than bottom-emitting devices and satisfactory luminous efficiency. The relatively high operating voltages can be further improved by the use of transport materials with enhanced charge mobility.</P>
양두병,김진환,이승원 大韓成形外科學會 1984 Archives of Plastic Surgery Vol.11 No.4
Recently, reduction mammaplasty is increasing in number among pre-marital status in Korea and number of methods were introduced and deployed by plastic surgeons. To find the most adequate and suitable methods for the Korean woman, we undertaken post-operative evaluation of 15 patients who had had reduction mammaplasty at the Department of Reconstructive Plastic Surgery, SNUH and Eul-Ji General Hospital for the past 5 years; Strombeck technique 4 cases, Pitanguy technique 1 case, McKissck technique 8 cases, Inferior Pedicle technique 2 cases, respectively. Evaluation was done under the items of age distribution, motivation, operative technique, and its pros and cons, grade of satisfaction after surgery etc. The results were as followings. 1. Age distribution of patients were in their twenties mostly after 1979, in comparison with in thirties from 1972 to 1978. 2, In the past, alleviation of symptoms associated with breast weight was principal motivation and on the contrary cosmetic improvement was their major operational goal recently. 3. Advantages and disadvantages were similar with other reports. 4. The larger the breast, patient satisfied with the operative results.