Browse > Article

Temperature Analysis for the Point-Cell Source in the Vapor Deposition Process  

Park, Jong-Wook (School of Mechanical and Automotive Engineering, Sunchon National University)
Kim, Sung-Cho (School of Mechanical and Automotive Engineering, Sunchon National University)
Hun Jung (Graduate School, Department of Mechanical Engineering, Chonnam National University)
Publication Information
Journal of Mechanical Science and Technology / v.18, no.9, 2004 , pp. 1680-1688 More about this Journal
Abstract
The information indicating device plays an important part in the information times. Recently, the classical CRT (Cathod Ray Tube) display is getting transferred to the LCD (Liquid Crystal Display) one which is a kind of the FPDs (Flat Panel Displays). The OLED (Organic Light Emitting Diodes) display of the FPDs has many advantages for the low power consumption, the luminescence in itself, the light weight, the thin thickness, the wide view angle, the fast response and so on as compared with the LCD one. The OLED has lately attracted considerable attention as the next generation device for the information indicators. And also it has already been applied for the outside panel of a mobile phone, and its demand will be gradually increased in the various fields. It is manufactured by the vapor deposition method in the vacuum state, and the uniformity of thin film on the substrate depends on the temperature distribution in the point-cell source. This paper describes the basic concepts that are obtained to design the point-cell source using the computational temperature analysis. The grids are generated using the module of AUTOHEXA in the ICEM CFD program and the temperature distributions are numerically obtained using the STAR-CD program. The temperature profiles are calculated for four cases, i.e., the charge rate for the source in the crucible, the ratio of diameter to height of the crucible, the ratio of interval to height of the heating bands, and the geometry modification for the basic crucible. As a result, the blowout phenomenon can be shown when the charge rate for the source increases. The temperature variation in the radial direction is decreased as the ratio of diameter to height is decreased and it is suggested that the thin film thickness can be uniformed. In case of using one heating band, the blowout can be shown as the higher temperature distribution in the center part of the source, and the clogging can appear in the top end of the crucible in the lower temperature. The phenomena of both the blowout and the clogging in the modified crucible with the nozzle-diffuser can be prevented because the temperature in the upper part of the crucible is higher than that of other parts and the temperature variation in the radial direction becomes small.
Keywords
OLED (Organic Light Emitting Diodes); Point-Cell Source; Radiative Heat Transfer; Conductive Heat Transfer; Vapor Deposition;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Burroughes, J. H., Bradley, D. D. C., Brown, A. R., Marks, R.N., Maackay, K., Friend, R. H., Burns, P. L. and Holmes, A. B., 1990, 'Light-Emitting Diodes Based on Conjugated Polymers,' Nature, Vol. 347, pp. 539-541   DOI
2 Hamada, Y., Sano, T., Shibata, K. and Kuroki, K., 1995, 'Influence of the Emission Site on the Running Durability of Organic Electroluminescent Devices,' Japanese Journal of Applied Physics, Vol. 34, pp. L824-L826   DOI   ScienceOn
3 Kang, G. W., Ahn, Y. J. and Lee, C. H., 2001, 'Effects of Doping in Organic Electroluminescent Devices Doped with a Fluorescent Dye,' Journal of Information Display, Vol. 2, No.3, pp. 1-5
4 Kim, S. W., 2003, 'Next Generation Mass Production Line and its OLED Module,' Society for Information Display 03 DIGEST, pp. 1414-1417   DOI
5 Ozisik, M. N., 1985, Heat Transfer, McGraw-Hill, pp. 593-701
6 Hoffmann, U., Netuschil, P., Bender, M., and Sauer, P., 2003, 'OLED Manufacturing Using Vertical In-Line Machine Concept,' Society for Information Display 03 DIGEST, pp. 1410-1413
7 ICEM CFD Reference Manual (version 4.2), 2000, ICEM Engineering
8 Lee., S. S., Song, T. J., Ko, M. S. and Cho, S. M., 2001, 'Low-Molecular-Weight White Organic- Light- Emitting- Devices using Direct Color Mixing Method,' Journal of Information Display, Vol. 2, No.3, pp.6-12
9 STAR-CD Methodology (version 3.15), 2001, Computational Dynamics Limited
10 Matsumoto, E., Maki, S., Yanagi, Y., Nishimori, T., Kondo, Y., Kishi, Y. and Kido, J., 2003, 'The High Deposition Rate and High Material Yield Evaporation Method for OLED Layers,' Society for Information Display 03 DIGEST, pp. 1422-1425   DOI
11 Park, S. I., 1991, 'Heat Transfer in Countercurrent Gas-Solid Flow inside the Vertical Pipes,' KSME International Journal, Vol. 5, No.2, pp.125-129
12 Park, W. H. and Kim, T. K., 2002, 'Narrow Band Radiative Solutions within a Cubical Enclosure Filled with Real Gas Mixtures,' KSME International Journal, Vol. 16, No.2, pp.861-869
13 Tang, C. W. and VanSlyke, S. A., 1987, 'Organic Electroluminescent Diodes,' Applied Physics Letter, Vol. 51, No. 12, pp. 913-915   DOI
14 Schwambera, M., Meyer, N., Gersdorff, M. and Reinhold, M., 2003, 'OLED Manufacturing by Organic Vapor Phase Deposition,' Society for Information Display 03 DIGEST, pp. 1419-1421
15 Smith, D. L., 1994, Thin-Film Deposition Principles and Practice, McGraw-Hill, pp.63-118
16 STAR-CD User Guide (version 3.15), 2001, Computational Dynamics Limited
17 Tokito, S., Takata, J. and Taga, Y., 1995, 'Organic/Inorganic Superlattices with Ordered Organic Layers,' Journal of Applied Physics, Vol. 77, No.5, pp. 1985-1989   DOI   ScienceOn
18 Tang, C. W., VanSlyke, S. A. and Chen, C. H., 1989, 'Electro luminescence of Doped Organic Thin Films,' Journal of Applied Physics, Vol. 65, No.9, pp. 3610-3616   DOI