發(fā)布時(shí)間：2018-04-05 04:17

  本文選題：有機(jī)電致發(fā)光二極管　切入點(diǎn)：納米粒子　出處：《蘇州大學(xué)》2015年碩士論文

【摘要】：由于有機(jī)電致發(fā)光二極管(OLED)具有主動(dòng)發(fā)光、寬視角、高效率,高響應(yīng)靈敏度、可制作大尺寸與柔性面板等諸多優(yōu)點(diǎn),使其已成為當(dāng)前光電器件領(lǐng)域一大研究熱點(diǎn)。近年來,雖然基于磷光材料制備的OLED內(nèi)量子效率可達(dá)到100%,但是由于內(nèi)部各個(gè)功能層折射率的不匹配等造成了器件的外量子效率不理想。表面等離子(SPP)技術(shù),被廣泛應(yīng)用于有機(jī)電致發(fā)光器件的研究中用來提高器件的發(fā)光效率。與此同時(shí),通過在器件中引入納米粒子實(shí)現(xiàn)對光的散射進(jìn)而改變光子在器件中的運(yùn)動(dòng)路徑,也是調(diào)控OLED發(fā)光效率的一種有效手段。本論文制備了單一結(jié)構(gòu)的金屬納米顆粒和復(fù)合結(jié)構(gòu)的納米粒子,并將其摻雜在電極緩沖層中,通過優(yōu)化摻雜緩沖層的厚度和納米材料的濃度,在實(shí)現(xiàn)了界面修飾和基于納米粒子的SPP效應(yīng)增強(qiáng)內(nèi)量子效率的同時(shí),也實(shí)現(xiàn)了基于納米結(jié)構(gòu)散射效應(yīng)增強(qiáng)的器件光取出效率研究。具體工作及效果如下:1.利用溶液法制備器件的電極緩沖層氧化鉬溶液,將金納米粒子摻雜在氧化鉬溶液中并優(yōu)化摻雜濃度,最終引入到器件中作為器件的電極緩沖層,制備的器件結(jié)構(gòu)如下:Glass/ITO/MoOx:Au NPs/NPB/Alq3/LiF/Al,利用氧化鉬的高功函數(shù)特性和金納米粒子的表面等離子體特性,降低了器件的驅(qū)動(dòng)電壓、進(jìn)而提高了器件的發(fā)光效率和穩(wěn)定性。2.區(qū)別于我們的前期工作基礎(chǔ),即采用四氧化三鐵參雜空穴傳輸層實(shí)現(xiàn)了器件驅(qū)動(dòng)電壓的降低和發(fā)光性能的改善。在此,綜合四氧化三鐵和金納米粒子兩者的特性,我們進(jìn)一步采用靜電吸附的方法制備了金納米粒子包裹的四氧化三鐵納米粒子,即Fe3O4@Au的復(fù)合納米粒子。將復(fù)合納米粒子摻雜到PEDOT:PSS空穴緩沖層中,實(shí)現(xiàn)基于金納米粒子的SPP和復(fù)合納米結(jié)構(gòu)的光散射效應(yīng)雙重調(diào)控的有機(jī)電致發(fā)光二極管,使得器件的效率提高了近一倍。總之,我們研究了不同納米材料摻雜電極緩沖層材料對器件性能的影響,并改變摻雜濃度和優(yōu)化摻雜層參數(shù)來實(shí)現(xiàn)對器件性能調(diào)控。最后綜合不同納米材料的特性,將其特性集成于復(fù)合納米結(jié)構(gòu)一體,在實(shí)現(xiàn)較好的電極界面能級匹配的同時(shí),還實(shí)現(xiàn)了器件內(nèi)、外量子效率的顯著增強(qiáng),使得器件效率實(shí)現(xiàn)高達(dá)一倍的提高,為獲得高效率低成本OLED器件的研究提供一定的工藝優(yōu)化基礎(chǔ)。
[Abstract]:Due to its advantages of active luminescence, wide viewing angle, high efficiency, high response sensitivity and the ability to fabricate large size and flexible panels, OLED has become a research hotspot in the field of optoelectronic devices.In recent years, although the quantum efficiency of OLED based on phosphorescent material can reach 100, the external quantum efficiency of the device is not ideal due to the mismatch of refractive index of each functional layer inside the device.Surface plasma spp (SPP) technology has been widely used to improve the luminescence efficiency of organic electroluminescent devices.At the same time, it is an effective method to control the luminescence efficiency of OLED by introducing nano-particles into the device to achieve light scattering and then changing the photon path in the device.In this paper, metal nanoparticles with single structure and nano-particles with composite structure were prepared and doped into the electrode buffer layer. The thickness of the doped buffer layer and the concentration of nano-materials were optimized.The interfacial modification and the SPP effect based on nanoparticles are used to enhance the internal quantum efficiency, and the optical extraction efficiency of the devices is also studied based on the enhancement of the scattering effect of nanostructures.The specific work and effect are as follows: 1.The electrode buffer layer molybdenum oxide solution was prepared by the solution method. The gold nanoparticles were doped in the molybdenum oxide solution and the doping concentration was optimized. Finally, the gold nanoparticles were introduced into the device as the electrode buffer layer.The structure of the device is as follows: Glass-IT / MoOxw: au NPsNPB / NPB / Alq3 / LiF / Al.The high power function characteristic of molybdenum oxide and the surface plasma characteristic of gold nanoparticles can reduce the driving voltage of the device and improve the luminescence efficiency and stability of the device.Different from our previous work, the device driving voltage is reduced and the luminescence performance is improved by using the ferric oxide impurity hole transport layer.In this paper, based on the characteristics of iron trioxide and gold nanoparticles, the gold nanoparticles coated with gold nanoparticles, Fe3O4@Au composite nanoparticles, were prepared by electrostatic adsorption.The composite nanoparticles are doped into the PEDOT:PSS hole buffer layer to realize the double regulation of the light scattering effect of the SPP based on gold nanoparticles and the light scattering effect of the composite nanostructures. The efficiency of the devices is nearly doubled.In a word, we studied the effect of buffer layer materials of different nano-materials on the device performance, and changed the doping concentration and optimized the doping layer parameters to achieve the device performance control.Finally, the properties of different nanomaterials are synthesized and integrated into the composite nanostructures. At the same time, the quantum efficiency inside and outside the devices is greatly enhanced while the electrode interface energy levels are matched well.The efficiency of the device can be doubled and the process optimization is provided for the research of high efficiency and low cost OLED devices.
【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;TB383.1

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