苯并咪唑铱配合物的合成及电致发光性能研究
发布时间：2018-10-16 12:14
【摘要】：有机电致发光二极管(OLED)作为平板显示及固体照明领域的新兴技术,受到人们的极大关注。越来越多的电子产品都采用了OLED技术。磷光材料在OLED中扮演十分重要的角色,由于其可以同时利用单线态和三线态激子进行发光,理论内量子效率可以达到100%。其中,基于苯并咪唑铱配合物由于具有发光效率高、分子结构稳定、电子传输性能优良、颜色易于调节等优点一直受到众多科研工作者的关注。本文基于2-苯基苯并咪唑配体,利用功能化基团(-F、-CF_3、咔唑、二苯基氧磷(dPPO))对其修饰,从而获得相应新型磷光铱配合物。研究不同的取代基对铱配合物的光物理性质及电致发光性质的影响。具体开展以下工作:(1)设计并合成了系列氟功能化苯并咪唑铱配合物(1F-Ir,2F-Ir和3F-Ir)。其最大发光波长为495-498 nm,光致发光效率为0.68-0.81。与母体苯并咪唑铱配合物0F-Ir(520 nm、0.65)相比,发光颜色蓝移20 nm左右,属蓝绿光,且发光效率有明显提高。此类配合物均具有良好的电致发光性能,其中基于配合物2F-Ir的掺杂器件具有最高的效率,分别为21.7%、70.1cdA~(-1)和24.2lmW~(-1)。(2)设计并合成了两种基于2-苯基苯并咪唑新型双极性铱配合物(tpbi)2Ir(acac)和(cpbi)2Ir(acac)。研究结果表明:两种配合物的最大发光波长均为520 nm,与母体配合物发光一致,配合物具有高的发光效率0.61-0.72和高的热稳定性357-383℃(5%分解)。基于(tpbi)2Ir(acac)的掺杂器件具有高的效率,达到了:60.6cdA~(-1)和18.8lmW~(-1)。(3)将强吸电子基(-CF_3和-dPPO)引入2-苯基苯并咪唑体系,设计并合成了新型铱配合物pCF_3-Ir、mCF_3-Ir和po-Ir。此类取代基的引入,对铱配合物的发光颜色有明显的调节。其中po-Ir发光颜色相对于母体配合物具有30 nm的红移,而且电化学研究结果表明po-Ir明显的提高了电子传输能力。基于po-Ir的掺杂器件具有高的效率,达到了75.3 cdA~(-1)和30.2 lmW~(-1)。
[Abstract]:Organic electroluminescent diode (OLED), as a new technology in flat panel display and solid state lighting, has attracted much attention. More and more electronic products adopt OLED technology. Phosphorescent materials play a very important role in OLED. Because they can make use of both singlet and three-wire excitons, the theoretical quantum efficiency can reach 100. Among them, because of its high luminescence efficiency, stable molecular structure, excellent electron transport performance and easy color adjustment, benzimidazolium iridium complexes have attracted much attention from many researchers. Based on 2-phenylbenzimidazole ligands, the novel iridium phosphor complexes were prepared by modifying the complexes with functional groups (-FN-CFS _ 3, carbazole, diphenyl phosphorus (dPPO). The effects of different substituents on the photophysical and electroluminescent properties of iridium complexes were investigated. The main works are as follows: (1) A series of fluorine-functionalized benzimidazolium iridium complexes (1F-Ir2F-Ir and 3F-Ir) were designed and synthesized. The maximum luminescence wavelength is 495-498 nm, and the photoluminescence efficiency is 0.68-0.81. Compared with the parent complex 0F-Ir (520 nm,0.65), the blue shift of the luminescence color is about 20 nm, and the luminescence efficiency is improved obviously. All these complexes have good electroluminescent properties. The doped devices based on 2F-Ir have the highest efficiency, which are 21.70.1 cdA-1 and 24.2lmW-1). (2. Two novel bipolar iridium complexes (tpbi) 2Ir (acac) and (cpbi) 2Ir (acac). Based on 2-phenylbenzimidazole have been designed and synthesized. The results show that the maximum luminescence wavelength of the two complexes is 520 nm,. The complexes have high luminescence efficiency of 0.61-0.72 and thermal stability of 357-383 鈩，
本文编号：2274323
[Abstract]:Organic electroluminescent diode (OLED), as a new technology in flat panel display and solid state lighting, has attracted much attention. More and more electronic products adopt OLED technology. Phosphorescent materials play a very important role in OLED. Because they can make use of both singlet and three-wire excitons, the theoretical quantum efficiency can reach 100. Among them, because of its high luminescence efficiency, stable molecular structure, excellent electron transport performance and easy color adjustment, benzimidazolium iridium complexes have attracted much attention from many researchers. Based on 2-phenylbenzimidazole ligands, the novel iridium phosphor complexes were prepared by modifying the complexes with functional groups (-FN-CFS _ 3, carbazole, diphenyl phosphorus (dPPO). The effects of different substituents on the photophysical and electroluminescent properties of iridium complexes were investigated. The main works are as follows: (1) A series of fluorine-functionalized benzimidazolium iridium complexes (1F-Ir2F-Ir and 3F-Ir) were designed and synthesized. The maximum luminescence wavelength is 495-498 nm, and the photoluminescence efficiency is 0.68-0.81. Compared with the parent complex 0F-Ir (520 nm,0.65), the blue shift of the luminescence color is about 20 nm, and the luminescence efficiency is improved obviously. All these complexes have good electroluminescent properties. The doped devices based on 2F-Ir have the highest efficiency, which are 21.70.1 cdA-1 and 24.2lmW-1). (2. Two novel bipolar iridium complexes (tpbi) 2Ir (acac) and (cpbi) 2Ir (acac). Based on 2-phenylbenzimidazole have been designed and synthesized. The results show that the maximum luminescence wavelength of the two complexes is 520 nm,. The complexes have high luminescence efficiency of 0.61-0.72 and thermal stability of 357-383 鈩，
本文编号：2274323
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