高效率、長(zhǎng)壽命磷光OLED主體和客體材料的設(shè)計(jì)、合成與性能研究
[Abstract]:OLED technology has made great progress in the last 30 years since the advent of OLED devices in the late 1980s. Both scientific research and industrial circles have great enthusiasm for OLED technology. Now, the efficiency, photochromism and device life have reached a high level. The stability of high-level OLED materials is still a great challenge for the preparation of long-lived blue-light OLED. In this paper, we will design and synthesize organic materials with different functions based on the efficiency and stability of the devices, with phosphorescent OLED as the main research content and the most important luminescent layer as the focus. Long-lived devices. Materials include high-trilinear host materials, long-lived blue guest materials and high-efficiency green light materials. The first part is about host materials. The second part focuses on the acridine-spirofluorene (SAF) unit, which has been proved to have good exciton transport properties. Fluorene derivatives are also para-linked. However, different functional groups of para-linked fluorene have a great influence on the singlet and triplet states of materials. Derivatives of Fluorene Derivatives at the para-position 4 carbon atom site usually have higher triplet levels. Unfortunately, they are prepared. Two new host materials, SAFDPA and SAFCz, were synthesized by carbon-nitrogen linking of fluorene with diphenylamine and carbazole groups at the C-N sites of fluorene. Their structures were characterized and confirmed. Their photophysical properties, thermal stability and measurements were carried out. The maximum external quantum efficiency of SAFCz-based blue-light and white-light OLED devices is 19.4% and 21.5% respectively. The second part is about the object materials, which are described in Chapter 3 and Chapter 4 respectively. Photo-PHOLEDs have many problems in efficiency, light color, especially in stability, and still need to be improved to be used in industrialization. Therefore, we hope that through the study of long-life blue-light object materials, we can make some meaningful work in the process of solving this worldwide problem. In the third chapter, we synthesized In the fourth chapter, we synthesized the green guest material (dmpp) 2Ir (dpp) with high efficiency and fabricated the OLED device. The maximum emission wavelength of the device is 550 nm. The device has a wide range of electroemission. More importantly, when the doping concentration is reduced to 3%, the device performance can still be better than that of conventional doping concentration. This work provides the possibility of preparing high efficiency phosphorescent OLED with low doping concentration, which may greatly reduce the production cost in future OLED lighting applications.
【學(xué)位授予單位】:蘇州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TN383.1
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