Dumbbell-Shaped Spirocyclic Aromatic Hydrocarbon to Control Intermolecular π−π Stacking Interaction for High-Performance Nondoped Deep-Blue Organic Light-Emitting Devices

• Published in: The journal of physical chemistry letters 2010-10, Vol.1 (19), p.2849-2853
• Main Authors: Gu, Ju-Fen, Xie, Guo-Hua, Zhang, Long, Chen, Shu-Fen, Lin, Zong-Qiong, Zhang, Zhen-Song, Zhao, Jian-Feng, Xie, Ling-Hai, Tang, Chao, Zhao, Yi, Liu, Shi-Yong, Huang, Wei
• Format: Article
• Language: English
• Subjects: Electron Transport, Optical and Electronic Devices, Hard Matter
• ISSN: 1948-7185; 1948-7185
• DOI: 10.1021/jz101039d

Dumbbell-shaped spirocyclic aromatic hydrocarbons on the basis of molecular modeling exhibit no π−π stacking interaction among chromophores in the molecular packing diagrams. A model compound of 1,6-di(spiro[fluorene-9,9′-xanthene]-2-yl)pyrene (DSFXPy) with the pyrene−pyrene distance of up to 10.4 Å has been synthesized for high-performance nondoped deep-blue organic light-emitting devices. The proof-of-concept nondoped OLEDs have been fabricated with the configuration of ITO/MoO x (2 nm)/NPB(30 nm)/DSFXPy(30 nm)/TPBi(40 nm)/LiF(1 nm)/Al. DSFXPy-based nondoped OLED exhibits a maximum current efficiency of 7.4 cd/A (4.6% at 260 cd m−2) and excellent CIE coordinates (0.16, 0.15) (at 6500 cd m−2), surpassing most reported nondoped deep-blue OLEDs. Dumbbell-shaped spirocyclic arenes will be promising candidates for OLEDs.