A Novel trans-1-(9-Anthryl)-2-phenylethene Derivative Containing a Phenanthroimidazole Unit for Application in Organic Light-Emitting Diodes

作者：Zhou, Nonglin; Wang, Shirong; Xiao, Yin; Li, Xianggao^*

来源：Chemistry-An Asian Journal, 2018, 13(1): 81-88.

DOI：10.1002/asia.201701371

• chromophores
• donor-acceptor systems
• fluorescence
• organic light-emitting diodes
• photoluminescence

Aryl-substituted phenanthroimidazoles (PIs) have attracted tremendous attention in the field of organic light-emitting diodes (OLEDs), because they are simple to synthesize and have excellent thermal properties, high photoluminescence quantum yields (PLQYs), and bipolar properties. Herein, a novel blue-green emitting material, (E)-2-{4'-[2-(anthracen-9-yl) vinyl]-[1,1'-biphenyl]-4-yl}-1-phenyl-1H-phenanthro[ 9,10-d] imidazole (APE-PPI), containing a t-APE [1-(9-anthryl)-2-phenylethene] core and a PI moiety was designed and synthesized. Owing to the PI skeleton, APE-PPI possesses high thermal stability and a high PLQY, and the compound exhibits bipolar transporting characteristics, which were identified by single-carrier devices. Nondoped blue-green OLEDs with APE-PPI as the emitting layer show emission at lambda=508 nm, a full width at half maximum of 82 nm, a maximum brightness of 9042 cdm(-2), a maximum current efficiency of 2.14 cdA(-1), and Commission Internationale de L'Eclairage (CIE) coordinates of (0.26, 0.55). Furthermore, a white OLED (WOLED) was fabricated by employing APE-PPI as the blue-green emitting layer and 4-(dicyanomethylene)2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB) doped in tris-(8-hydroxyquinolinato) aluminum (Alq(3)) as the red-green emitting layer. This WOLED exhibited a maximum brightness of 10029 cdm(-2), a maximum current efficiency of 16.05 cdA(-1), CIE coordinates of (0.47, 0.47), and a color rendering index (CRI) of 85. The high performance of APE-PPI-based devices suggests that the t-APE and PI combination can potentially be used to synthesize efficient electro-luminescent materials for WOLEDs.

• 出版日期2018-1-4
• 单位天津大学