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Study and Fabrication of High-efficiency Organic Light-emitting Diodes (OLED)

Author: ZhouDongYing
Tutor: LiaoLiangSheng
School: Suzhou University
Course: Materials Processing Engineering
Keywords: The organic electroluminescent device Interface electron injection Organic electron injecting material Light-scattering layer The optical efficiency
CLC: TN383.1
Type: Master's thesis
Year: 2011
Downloads: 140
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Abstract


Organic electroluminescent devices (OLED) with high brightness, low power consumption, soft colors and simple preparation, etc., is expected in the next-generation display and lighting to get important applications. OLED luminous efficiency and improve the optical efficiency, we can further extend the working life of the device and to achieve the purpose of saving energy in order to meet the actual application requirements. In this thesis, the electron injection through the interface of the device behavior, new electronic injection material, light-scattering layer summary study of improving electron injection efficiency within the device and external light scattering efficiency two aspects, to explore ways to prepare high efficiency of the OLED. This paper compares the two different LiF and Liq performance under the electron transport material, found to be considered superior LiF electron injection material and in some cases does not play a role. Liq proved better results and practical value injection and use of photovoltaic Comparison of both of the injection barrier is analyzed into its interface mechanism. Inspired by the above findings, according to the experimental conditions, a series of quinoline derivatives were synthesized sodium complexes. Some of sodium complexes in the OLED as the electron injecting material may be a good electron injection barrier reduced, improving the efficiency of carrier injection effect. Use H 1 -NMR, UV-Vis techniques were used to characterize these materials, combined with computer simulation analysis of the structural approach to improve the efficiency of electron injection possible effects. In order to improve the optical efficiency of the device presents a roughened surface of the substrate and the light-scattering layer combination technology. Analysis of the scattering layer film morphology, transmission, particle size and surface roughness of the substrate and other factors on the light extraction efficiency enhancing effect. Found that TiO 2 particle size of 100 nm light scattering when the best, allows the device to the optical efficiency of 59% of the maximum increase. Research results, a new type of electron injecting material based on the metal complexes of sodium, sodium reduction of other expensive alkali metal (such as lithium, cesium) and alkaline earth metal (such as barium) are used, the same high efficiency can be obtained; substrate surface roughened with a combination of light scattering layer technique can not only greatly improve the optical efficiency, and more than two-dimensional photonic crystal and micro prism array by means of more easily prepared, and inexpensively. In summary, these two aspects of the research results can help reduce OLED production costs, which for the realization of industrial application of OLED technology has great significance.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Semiconductor technology > Light-emitting devices >
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