微納結(jié)構(gòu)柔性有機(jī)發(fā)光器件的光調(diào)控研究
[Abstract]:In recent years, with the advent of wearable electronic products (such as smart watches, bracelets, etc.), including the continuous introduction of curved OLED display and lighting products (mainly from LG Display,LG Chemistry), flexible OLED (FOLED) has become the focus of more and more attention. The so-called flexible OLED, is an organic electroluminescent device based on flexible substrate (PET,PC, PEN, etc.). Compared with the traditional LCD and LED, it not only has self-luminescence, but also has wide chromatography. Because of its lightness, FOLED can show the advantages of organic materials in flexible wearable applications. However, if we want to bring FOLED to market more quickly, we should not only solve the problem of yield, but also solve the problem of luminous efficiency and stability. Therefore, the research and production of FOLED devices still have a lot of space to expand. For example, how to improve the luminescence efficiency of FOLED devices, how to introduce the internal light extraction structure more conveniently, and how to extend the service life of OLED, etc. In this thesis, the photoluminescence and hole injection layer modification of flexible electroluminescent devices (FOLED) is studied, introducing periodic and quasi-random nanostructures, as well as composite hole injection layers, respectively. The effects of different optical extraction structures on the performance of the devices were further studied, and the luminescence efficiency and stability of the devices were improved effectively. The specific research contents and main results are as follows: 1. Study on the introduction and performance of MoOx:Au NPs Composite bonding layer in the device by solution method. The molybdenum oxide (MoOx) precursor synthesized by solution method and the nano-gold (Au,Diameter of 20nm) particles synthesized by citric acid method were mixed together and applied to OLED as a composite hole implantation layer (HIL). OLED devices with ITO/MoOx:Au NPs/NPB/Alq3/LiF/Al structure were fabricated. Using the reliable work function of molybdenum oxide and the surface plasma effect of gold particles, OLED devices with lower driving voltage, higher luminescence efficiency and better stability were achieved. 2. Using nano-soft imprint technique, PEDOT:PSS imprint quasi-random moth eye structure is injected into the hole of FOLED. Compared with periodic one-dimensional and two-dimensional grating, quasi-random moth eye structure has the best effect on the light regulation of FOLED (relative to standard device). There are nearly 50% enhancement of external quantum efficiency (EQE), both for light extraction efficiency, spectral angle stability, and extraction broad-spectrum properties of RG GnB trichrome. Combined with FDTD far-field simulation, the green light FOLED is taken as an example. Compared with the unstructured device of flat, the efficiency and angle stability of the device based on moth eye are the best. The periodic grating, due to Bragg diffraction, leads to spectral selectivity and angular dependence. 3. 3. Subsequently, based on the consideration of flexible device ITO-free and the previous work of PEDOT:PSS as hole injection layer, we also study the introduction of highly conductive PEDOT:PSS as positive electrode on structured UV/PET substrate, and then fabricate FOLED.. Through literature investigation, the conductivity of PEDOT:PSS can be increased by two methods: additive and post-treatment. The maximum conductivity of PEDOT:PSS can be as high as 2500 S cm-1.. However, the conductivity of PEDOT:PSS is not stable due to its water absorption. Through the application of specific devices, the high conductive PEDOT:PSS of Flat UV is taken as the standard device, and the efficiency of the devices with UV structure can be greatly improved by the photoextraction of nano-microstructures, but the lifetime of the devices is still a big problem. Will be further improved through follow-up work.
【學(xué)位授予單位】:蘇州大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TN383.1
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