發(fā)布時間：2018-10-16 12:14

【摘要】：有機電致發(fā)光二極管(OLED)作為平板顯示及固體照明領(lǐng)域的新興技術(shù),受到人們的極大關(guān)注。越來越多的電子產(chǎn)品都采用了OLED技術(shù)。磷光材料在OLED中扮演十分重要的角色,由于其可以同時利用單線態(tài)和三線態(tài)激子進行發(fā)光,理論內(nèi)量子效率可以達(dá)到100%。其中,基于苯并咪唑銥配合物由于具有發(fā)光效率高、分子結(jié)構(gòu)穩(wěn)定、電子傳輸性能優(yōu)良、顏色易于調(diào)節(jié)等優(yōu)點一直受到眾多科研工作者的關(guān)注。本文基于2-苯基苯并咪唑配體,利用功能化基團(-F、-CF_3、咔唑、二苯基氧磷(dPPO))對其修飾,從而獲得相應(yīng)新型磷光銥配合物。研究不同的取代基對銥配合物的光物理性質(zhì)及電致發(fā)光性質(zhì)的影響。具體開展以下工作:(1)設(shè)計并合成了系列氟功能化苯并咪唑銥配合物(1F-Ir,2F-Ir和3F-Ir)。其最大發(fā)光波長為495-498 nm,光致發(fā)光效率為0.68-0.81。與母體苯并咪唑銥配合物0F-Ir(520 nm、0.65)相比,發(fā)光顏色藍(lán)移20 nm左右,屬藍(lán)綠光,且發(fā)光效率有明顯提高。此類配合物均具有良好的電致發(fā)光性能,其中基于配合物2F-Ir的摻雜器件具有最高的效率,分別為21.7%、70.1cdA~(-1)和24.2lmW~(-1)。(2)設(shè)計并合成了兩種基于2-苯基苯并咪唑新型雙極性銥配合物(tpbi)2Ir(acac)和(cpbi)2Ir(acac)。研究結(jié)果表明:兩種配合物的最大發(fā)光波長均為520 nm,與母體配合物發(fā)光一致,配合物具有高的發(fā)光效率0.61-0.72和高的熱穩(wěn)定性357-383℃(5%分解)�；�(tpbi)2Ir(acac)的摻雜器件具有高的效率,達(dá)到了:60.6cdA~(-1)和18.8lmW~(-1)。(3)將強吸電子基(-CF_3和-dPPO)引入2-苯基苯并咪唑體系,設(shè)計并合成了新型銥配合物pCF_3-Ir、mCF_3-Ir和po-Ir。此類取代基的引入,對銥配合物的發(fā)光顏色有明顯的調(diào)節(jié)。其中po-Ir發(fā)光顏色相對于母體配合物具有30 nm的紅移,而且電化學(xué)研究結(jié)果表明po-Ir明顯的提高了電子傳輸能力�；趐o-Ir的摻雜器件具有高的效率,達(dá)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，

本文編號：2274323