Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Tuning the Excited State of Tetradentate Pd(II) and Pt(II) Complexes through Benzannulated N‐Heteroaromatic Ring and Central Metal

Tuning the Excited State of Tetradentate Pd(II) and Pt(II) Complexes through Benzannulated... A series of tetradentate Pd(II) and Pt(II) complexes containing fused 5/6/6 metallocycles with phenyl N‐heteroaromatic benzo[d]imidazole (pbiz), benzo[d]oxazole (pboz) or benzo[d]thiazole (pbthz)‐containing ligands was developed. Systematic studies by experiments and theoretical calculations reveal that both the central metal and the benzannulated N‐heteroaromatic ring have significant influence on the electrochemical, photophysical and excited‐state properties of the Pd(II) and Pt(II) complexes. In identical condition, compared to pbiz‐based Pd(II) and Pt(II) complexes, the corresponding metal complexes with pboz and pbthz‐containing ligand show significant red‐shift emission spectra. Pd(II) complexes exhibit blue‐shift emission spectra in comparison with the corresponding Pt(II) complexes. The Pt(II) complexes possess more metal‐to‐ligand charge transfer (3MLCT) character in their T1 states, which enables the Pt(II) complexes to have much higher quantum efficiencies (ΦPL) and shorter excited‐state lifetimes (τ), resulting in large radiative decay rates (kr). Especially, Pt(pbiz) has a ΦPL of 94% with a τ of 4.0 μs in 5 wt% doped PMMA film at room temperature. Pt(pbiz)‐doped green organic light‐emitting diode (OLED) using 26mCPy as host demonstrated a peak external quantum efficiency (EQE) of 21.6% and a maximum brightness (Lmax) of 55481 cd/m2, which still maintained an EQE of 16.5% and 10.8% at 1000 and 10000 cd/m2, respectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chinese Journal of Chemistry Wiley

Tuning the Excited State of Tetradentate Pd(II) and Pt(II) Complexes through Benzannulated N‐Heteroaromatic Ring and Central Metal

Download PDF
12 pages

Loading next page...
 
/lp/wiley/tuning-the-excited-state-of-tetradentate-pd-ii-and-pt-ii-complexes-QUzXhEOiBA

References (67)

Publisher
Wiley
Copyright
© 2022 SIOC, CAS, Shanghai, & WILEY‐VCH GmbH
ISSN
1001-604X
eISSN
1614-7065
DOI
10.1002/cjoc.202100641
Publisher site
See Article on Publisher Site

Abstract

A series of tetradentate Pd(II) and Pt(II) complexes containing fused 5/6/6 metallocycles with phenyl N‐heteroaromatic benzo[d]imidazole (pbiz), benzo[d]oxazole (pboz) or benzo[d]thiazole (pbthz)‐containing ligands was developed. Systematic studies by experiments and theoretical calculations reveal that both the central metal and the benzannulated N‐heteroaromatic ring have significant influence on the electrochemical, photophysical and excited‐state properties of the Pd(II) and Pt(II) complexes. In identical condition, compared to pbiz‐based Pd(II) and Pt(II) complexes, the corresponding metal complexes with pboz and pbthz‐containing ligand show significant red‐shift emission spectra. Pd(II) complexes exhibit blue‐shift emission spectra in comparison with the corresponding Pt(II) complexes. The Pt(II) complexes possess more metal‐to‐ligand charge transfer (3MLCT) character in their T1 states, which enables the Pt(II) complexes to have much higher quantum efficiencies (ΦPL) and shorter excited‐state lifetimes (τ), resulting in large radiative decay rates (kr). Especially, Pt(pbiz) has a ΦPL of 94% with a τ of 4.0 μs in 5 wt% doped PMMA film at room temperature. Pt(pbiz)‐doped green organic light‐emitting diode (OLED) using 26mCPy as host demonstrated a peak external quantum efficiency (EQE) of 21.6% and a maximum brightness (Lmax) of 55481 cd/m2, which still maintained an EQE of 16.5% and 10.8% at 1000 and 10000 cd/m2, respectively.

Journal

Chinese Journal of Chemistry – Wiley

Published: Jan 15, 2022

Keywords: Semiconductors; Luminescence; Platinum and Palladium; Energy conversion; OLED

There are no references for this article.