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Synthesis and Characteristics of Organic Red‐Emissive Materials Based on Phenanthro[9,10‐d]imidazole
Chemistry - An Asian Journal ( IF 4.1 ) Pub Date : 2018-12-17 , DOI: 10.1002/asia.201801578
Chaoyi Liu 1 , Jinyu Li 1 , Xiaxia Man 2 , Hui Liu 1 , Xiaoyi Sun 1 , Futong Liu 1 , Ping Lu 1
Affiliation  

Red emission is one of the three primary colors that are essential for the realization of full‐color displays and solid‐state lightings. A high solid‐state efficiency is a crucial factor for the applications in organic light‐emitting diodes (OLEDs). In this work, two new donor‐acceptor‐donor type phenanthro[9,10‐d]imidazole (PIM)‐based derivatives, (2Z,2′Z)‐2,2′‐(1,4‐phenylene)bis(3‐(4‐(1‐phenyl‐1H‐phenanthro[9,10‐d]imidazol‐2‐yl)phenyl)acrylonitrile) (PIDSB) and 2,3‐bis(4′‐(1‐phenyl‐1H‐phenanthro[9,10‐d]imidazol‐2‐yl)‐[1,1′‐biphenyl]‐4‐yl)fumaronitrile (PIDPh), are designed and synthesized. Both of them possess high thermal stabilities. PIDPh shows typical characteristics of aggregation‐induced emission enhancement, while PIDSB displays an aggregation‐caused quenching effect. They both exhibit significant red‐shifted emissions compared with PIM owing to intramolecular charge transfer. In the film state, the emission peaks of PIDSB and PIDPh are located at 538 nm and 605 nm with high photoluminescent quantum yields of 63.82 % and 41.26 %, respectively. The non‐doped OLED using PIDPh as the active layer shows the maximum external quantum efficiency of 2.06 % with a very low efficiency roll‐off, and exhibits the electroluminescent peak at 640 nm with a Commission Internationale de l′Éclairage coordinate of (0.617,0.396), meeting well the criteria of red OLEDs.

中文翻译:

苯并[9,10-d]咪唑类有机发光材料的合成与表征

红色发射是实现全色显示器和固态照明必不可少的三种原色之一。固态效率高是有机发光二极管(OLED)应用的关键因素。在这项工作中,有两种新的供体-受体-供体类型的菲咯啉[9,10- d ]咪唑(PIM)基衍生物,(2Z,2'Z)-2,2'-(1,4-亚苯基)bis( 3-(4-(1-苯基-1 H-菲并[9,10 - d ]咪唑-2-基)苯基)丙烯腈)(PIDSB)和2,3-双(4'-(1-苯基-1)ħ -phenanthro [9,10- d ]咪唑-2-基) - [1,1'-联苯] -4-基)富马腈(PIDPh),设计并合成的。它们都具有很高的热稳定性。物理化学显示了聚集诱导的发射增强的典型特征,而PIDSB显示了聚集引起的猝灭效果。与PIM相比,由于分子内电荷转移,它们都表现出显着的红移发射。在薄膜状态下,PIDSBPIDPh的发射峰位于538 nm和605 nm处,分别具有63.82%和41.26%的高光致发光量子产率。使用PIDPh作为有源层的非掺杂OLED的最大外部量子效率为2.06%,效率滚降非常低,并且在640 nm处显示电致发光峰,其国际照明委员会坐标为(0.617, 0.396),完全符合红色OLED的标准。
更新日期:2018-12-17
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