C ₁-Symmetrical [Ir(C^N¹)(C^N²)(N^O)]-tris-heteroleptic Ir(iii)-complexes with one strong N^O-ancillary π-donor for efficient all-solution-processed near-infrared (NIR) polymer light-emitting diodes (PLEDs)

Abstract

Among reliable vacuum-deposited or solution-processed NIR-OLEDs/PLEDs doped with NIR-emitting iridium(III)-complexes, high-performance achievement of their all-solution-processed NIR-PLEDs remains a great challenge. In this study, owing to the forceful electronic perturbation achieved...

Asymmetric Tris-Heteroleptic Cyclometalated Phosphorescent Iridium(III) Complexes: An Emerging Class of Metallophosphors

“…Very recently, by utilizing the classical ligand 1-(benzo­[ b ]­thiophen-2-yl)­isoquinoline (btiq), a series of NIR emissive tris -heteroleptic iridophosphors 27 – 31 (Figure a) were developed by us. − For the acac-based complexes 27 – 29 , their emission wavelengths and PLQYs (703 nm, 0.18 for 27 ; 715 nm, 0.26 for 28 ; 707 nm, 0.28 for 29 ) can be tuned by the second C ∧ N ligand. The remarkably enhanced PLQYs of these iridophosphors are attributed to the strengthened 3 MLCT contribution.…”

A narrowband red-emitting asymmetric iridium(iii) complex featuring B- and N-embedded π-conjugation units: structure, photophysics and OLED application

“…13 On the other hand, most of the reported neutral heteroleptic phosphorescent iridium(III) complexes are symmetric, 29,30 that is, they usually contain two identical cyclometalating bidentate ligands, such as the previously reported symmetric iridium(III) complexes IrBBacac and IrNNacac (Scheme 1, top), which contain two identical B-and N-embedded cyclometalating ligands, respectively. In contrast, there is also a class of asymmetric neutral heteroleptic iridium(III) complexes with three different cyclometalating bidentate ligands, [31][32][33][34] which are more suitable for the introduction of different functional groups, ultimately improving the electroluminescence performance. This unique molecular framework will give us more flexibility in material design, synthesis, and the regulation of optical properties and molecular dipole moments.…”