Issue 41, 2022

Green light-emitting electrochemical cells based on platinum(ii) complexes with a carbazole-appended carbene ligand

Abstract

Platinum(II) complexes bearing new carbazole-appended cyclometallated N-heterocyclic carbenes such as [Pt(Cbz-C^C*)Cl(NCCH3)](3), [Pt(Cbz-C^C*)Cl(PPh3)](4), [Pt(Cbz-C^C*)(PPh3)(py)]PF6 (py = pyridine, 5), [Pt(Cbz-C^C*)(P^N)]PF6 (P^N = 2-(2-(diphenylphosphino) ethyl) pyridine, 6), and [Pt(Cbz-C^C*)(P^P)]PF6 (P^P: 1,1-bis(diphenylphosphino)methane, dppm 7; 1,2-bis(diphenylphosphino)ethane, dppe, 8, 1,2-bis(diphenylphosphino) benzene, dppbz, 9) have been prepared using a stepwise procedure from 9-(4-bromo-phenyl)-9H-carbazole, imidazole, [{Pt(μ-Cl)(η3-2-Me-C3H4)}2] and the corresponding ancillary ligands. They have been fully characterized. Also, single-crystal X-ray structures, theoretical calculations and photophysical studies have been performed. These complexes have been employed as emitters in simple solution-processed light-emitting electrochemical cells (LECs). When driven under a pulsed current of 50 A m−2, devices based on 7–9 exhibited green emission, a luminance of 265 cd m−2 and a current efficiency of 5.7 cd A−1 (for the best performing emitter, 7). As far as we know, these are the first examples of green-emitting Pt(II)-based LECs.

Graphical abstract: Green light-emitting electrochemical cells based on platinum(ii) complexes with a carbazole-appended carbene ligand

Supplementary files

Article information

Article type
Paper
Submitted
17 Jun 2022
Accepted
16 Sep 2022
First published
03 Oct 2022
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. C, 2022,10, 15491-15500

Green light-emitting electrochemical cells based on platinum(II) complexes with a carbazole-appended carbene ligand

S. Fuertes, L. Mardegan, I. Martínez, S. Ventura, I. Ara, D. Tordera, H. J. Bolink and V. Sicilia, J. Mater. Chem. C, 2022, 10, 15491 DOI: 10.1039/D2TC02539F

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