Enhancing the photoluminescence quantum yields of blue-emitting cationic iridium(iii) complexes bearing bisphosphine ligands

Abstract

We demonstrate a turn-on strategy for blue-emitting [Ir(C^N)2(P^P)]PF6 complexes and apply them to EL devices.

Influencing the Optoelectronic Properties of a Heteroleptic Iridium Complex by Second-Sphere H-Bonding Interactions

“…Upon introduction of 3 to a solution of 1, the potential of adduct 1¥3 is anodically shifted to 1.17 V due to the formation of 1¥3 H-bonded complex, which act to remove electron density from the benzimidazole portion of the N^Nligand (the H-bond acceptor with the highest density of HOMO occupancy), thereby stabilizing the complex. [33] This analysis is further supported by the DFT calculations where the T1 spin-density distributions show spin density shared across both components of 1¥3 ( Figure 5). This intermolecular electronic communication between the heterodimer is further corroborated by DFT calculations where the frontier HOMO orbitals are situated largely on the Ir III centre and the N^Nligand while the LUMO is entirely localized on 3.…”

Recent Progress in Ionic Iridium(III) Complexes for Organic Electronic Devices

“…Besides these pyridine, pyrazole, and imidazole derivatives, bidentate ancillary ligands are rapidly increasing in variety. New types of N ^ N ligands, such as triazole, tetrazole, carbene, and oxazoline have been continually developed and tactfully exploited for cationic iridium(III) complexes with tunable emission colors, together with phosphane‐based N^P or P^P ligands …”

Exploring the self-assembly and energy transfer of dynamic supramolecular iridium-porphyrin systems

“…Zinc tetraphenylphorphyrin (ZnTPP) was prepared in high yield by complexation of tetraphenylporphyrin with anhydrous zinc acetate. 17 The purity of the complexes was confirmed by 1 H, 13 C, and 19 F NMR spectroscopy, HRMS and melting point analyses (see the Electronic Supplementary Information, ESI). HRMS analysis showed in each case the diagnostic molecular ion peak.…”

“…This feature was also observed in the crystal structures reported for other mesitylcontaining iridium complexes. 13 The four pyridine rings of the qpy moiety in each of 1, 1a…”

“…The assignment of all of the resonances in the 1 H NMR spectrum of 1, 1a and 1b ( Figure S41) was carried out using 2D 1 H-1 H COSY, 1 H-13 C HMBC and 1 H- 13 [19][20] In each complex, an orthogonal orientation of the mesityl ring with respect to the pyridine ring is observed (torsion angles ca.…”