| The basic organic light-emitting device (OLED) consists of a number of ultra-thin organic layers between two electrodes. Under low applied voltage, the recombination of carriers coming from cathode and anode can produce intense light output. Since 1987, OLED have received much attention and now are beginning to enter the display markets where they may eventually be the dominant flat panel display devices.This thesis mainly discusses the degradation of OLED.Firstly, this paper mainly introduces the history and the principle of OLED.Chapter 3 provides the processing system for fabricating OLED. A simple display panel is made and measured using hand-made luminous characteristics test system.In chapter 4, the storage and operation stability of OLED are measured using hand-made lifetime test system. The degradation of OLED due to the growth of dark spots can be attributed to the synergy of two external causes: pollution by water vapor and pollution by oxygen. The morphological changes of the Al electrode surface were observed through the microscope with CCD camera. The results indicated that they had related with the operation time and the operation voltage. Under the different operation time and voltage, the different level of morphological changes of Al electrode surface was observed. Else, inter-reaction between electrode and organic materials, and the thermal stability of the organic materials can also lead to appearing dark spots in OLED.Finally, the conclusions of this thesis for OLED display are considered. |
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