Enhancing Molecular Aggregations by Intermolecular Hydrogen Bonds to Develop Phosphorescent Emitters for High‐Performance Near‐Infrared OLEDs

Advanced Science

Zhaoxin Wu¹  Xiaolong Yang²  Yuanhui Sun²  Xianbin Xu²  Haoran Guo²  Guijiang Zhou²  Wei Ma³ 

[1] Key Laboratory for Physical Electronics and Devices of the Ministry of Education Faculty of Electronic and Information Engineering Xi'an Jiaotong University Xi'an 710049 P. R. China;MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Department of Chemistry School of Science Xi'an Jiaotong University Xi'an 710049 P. R. China;State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China;

关键词: hydrogen bonds;    molecular aggregation;    near‐infrared emission;    organic light‐emitting devices;    Pt(II) complexes;   

DOI  :  10.1002/advs.201801930

来源: DOAJ

【 摘 要 】

Abstract Phosphorescent near‐infrared (NIR) organic light‐emitting devices (OLEDs) have drawn increasing attention for their promising applications in the fields such as photodynamic therapy and night‐vision readable displays. Here, three simple phosphorescent Pt(II) complexes are synthesized, and their intermolecular interactions are investigated in crystals and neat films by X‐ray single crystal diffraction and grazing‐incidence wide‐angle X‐ray scattering, respectively. The photophysical properties, molecular aggregation (including Pt–Pt interaction), molecular packing orientation, and electron transport ability are all influenced by the strong intermolecular hydrogen bonds. Consequently, the nondoped OLEDs based on tBu‐Pt and F‐Pt show electroluminescent emissions in NIR region with the highest external quantum efficiencies of 13.9% and 16.7%, respectively.

【 授权许可】

Unknown