Heteroleptic Zinc(II) complex based stable solution-processed organic electroluminescent diodes

• Published in: Optical materials 2021-09, Vol.119, p.111305, Article 111305
• Main Authors: Solanki, Jaydip D., Kumar Yadav, Rohit Ashok, Kesavan, Kiran, Siddiqui, Iram, Jayakumar, Jayachandran, Jou, Jwo-Huei, Surati, Kiran R.
• Format: Article
• Language: English
• Subjects: Bluish-green emission; Heteroleptic Zn(II) complexes; OLED; Solution-process
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2021.111305

Synthesis, characterization, and photophysical properties of heteroleptic Zn(II) complex. The complexes (Zn-1 and Zn-2) were well-characterized by UV–Vis, fluorescence spectroscopy, phosphorescence spectroscopy, cyclic voltammetry, photoluminescence quantum yield, thermogravimetric analysis, and atomic force microscopy. Moreover, density functional theory (DFT) and time-dependent density functional theory (TD-DFT) also performed to examine the geometries and electronic structures of the ground states, transition energies and excited-state structures. The Zn-2 exhibits favorable triplet energy, thermal stability, and quantum yield compared to Zn-1. Stable solution-processed OLEDs were fabricated and Zn-2 based device exhibits an efficient bluish-green emission with a maximum EQE of 1.6% and CE of 3.2 cd/A. [Display omitted] •Novel heteroleptic Zn(II) complexes is designed and synthesized.•Excellent photophysical and high thermal stabilities, and electroluminescent features of the complexes.•Stable solution-processed OLEDs were fabricated of synthesized Zn(II) complexes.•Stable device of Zn(II) complexes with bluish-green emission and low turn-on voltage.