Tetradentate Pt complexes for organic light-emitting diodes

Responsive macrocyclic and supramolecular structures powered by platinum

“…These structures have indeed yielded phosphorescent materials with interesting properties both in solution and in the solid state. [93][94][95][96][97][98][99][100] Our group has also explored bridged Pt II complexes to exploit their photoluminescence and chromic behavior. In particular, our studies have focused on the cyclometalated complex 39 (Scheme 4a), which contains an oxygen bridge and methoxy substituents to confer good solubility.…”

Fused Cycloalkyl Unit‐Functionalized Tetradentate Pt(II) Complexes for Efficient and Narrow‐Emitting Deep Blue Organic Light‐Emitting Diodes

“…Finally, Pt-tmCyCz was obtained by metalation using dichloro(1,5cyclooctadiene)platinum(II). The obtained final Pt(II) complex was characterized by 1 H-nuclear magnetic resonance (NMR), 13 C-NMR and high-resolution mass spectroscopy (Supporting Information).…”

“…While Ir(III)-based phosphorescent emitters have been extensively developed, [10][11][12] plenty of Pt(II)-based phosphors have been also constructed due to their favorable photophysical properties, including high photoluminescence quantum yields. [13] Specifically, Pt(II) complexes with rigid tetradentate ligands have been shown to exhibit narrow blue spectra, resulting high efficiency and long lifetime OLEDs. [14][15][16][17][18][19][20] Li group reported a deep blue Pt(II) emitter, PtON7-dtb, using N-heterocyclic carbene (NHC) based tetradentate ligand and it showed good commission internationale de l'eclairage (CIE) y coordinate of 0.079 and high external quantum efficiency (EQE) of 24.8%.…”

“…While Ir(III)‐based phosphorescent emitters have been extensively developed, [ 10–12 ] plenty of Pt(II)‐based phosphors have been also constructed due to their favorable photophysical properties, including high photoluminescence quantum yields. [ 13 ] Specifically, Pt(II) complexes with rigid tetradentate ligands have been shown to exhibit narrow blue spectra, resulting high efficiency and long lifetime OLEDs. [ 14–20 ]…”

Perimidocarbene-Based Tetradentate Platinum(II) Complexes with an Unexpectedly Negligible 3MLCT Character

“…34,35,54,56 Therefore, tetradentate ligands are priority to design new Pt(II) complexes in the past decade. 35,57,58 Moreover, the photophysical properties of the tetradentate Pt(II) complexes are also greatly affected by their excited-state properties, especially the lowest triplet excited state (T 1 ). The intersystem crossing (ISC) from the lowest singlet state (S 1 ) to T 1 and then to the ground state (S 0 ) is a critical transition for phosphorescent Pt(II) complexes; this process is generally facilitated by the heavy metal effect induced strong spin-orbital coupling (SOC), which further enables significant metal-to-ligand charge transfer ( 3 MLCT) character in the T 1 state, usually >10%.…”