The structural effects of ligands on the emission properties Pt(<sc>ii</sc>) complexes and promising applications luminescent in various areas are discussed.

Abstract Intramolecular through‐space charge‐transfer (TSCT) excited states have been exploited for developing thermally activated delayed fluorescence (TADF) emitters, but the tuning of state dynamics by conformational engineering remains sparse. Designed here is a series TSCT emitters with precisely controlled alignment donor and acceptor segments. With increasing intramolecular π–π interactions, radiative decay rate lowest singlet (S 1 ) progressively increased together suppression...

The synthesis, structures and photophysical properties of the charge-neutral Pt(II) complexes (1–6) their Pd(II) (7) Ni(II) (8) congeners supported by tetradentate dianionic bis[phenolate-(N-heterocyclic carbene)] ligands are described. X-ray crystal two solvatomorphs 2, which has p-F substituents on ligand, have been determined. all were examined. In THF solutions, 1–4 display deep blue phosphorescence (λmax = ∼440–460 nm, Φe 3–18% τ 0.5–3.5 μs). solutions at room temperature, 5–8 show...

Abstract Herein are described the synthesis, photophysical properties and applications of a series luminescent cyclometalated Au III complexes having an auxiliary aryl ligand. These show photoluminescence with emission quantum yields up to 0.79 in solution 0.84 thin films (4 wt % PMMA) at room temperature, both which highest reported values among complexes. Thermally activated delayed fluorescence (TADF) is origin for some these Solution‐processed OLEDs made showed sky‐blue green...

Luminescent pincer-type Pt(II) complexes supported by C-deprotonated π-extended tridentate RC^N^NR' ligands and pentafluorophenylacetylide show emission quantum yields up to almost unity. Femtosecond time-resolved fluorescence measurements time-dependent DFT calculations together reveal the dependence of excited-state structural distortions [Pt(RC^N^NR')(CC-C6 F5 )] on positional isomers ligand. Pt [Pt(R-C^N^NR')(CC-Ar)] are efficient photocatalysts for visible-light-induced reductive...

High performance orange (EQE up to 15.64%) and white 6.88%) solution processed OLEDs fabricated solely with emitters of non-platinum group metals were reported. The device has CIE coordinates (0.42, 0.44) CRI 81.

Palladium(ii) complexes supported by tetradentate [N^C^C^N] and [O^N^C^N] ligand systems display sky blue to red phosphorescence with emission quantum yields lifetimes up 0.64 272 μs, respectively. Femtosecond time-resolved fluorescence (fs-TRF) measurements on these Pd(ii) reveal a fast intersystem crossing from singlet triplet manifolds time constants of 0.6-21 ps. DFT/TDDFT calculations revealed that, as result the spiro-fluorene bridging tertiary amine units ligands, T

The Pt(II) complexes (1–3) bearing tetradentate O∧N∧C∧N ligands display high emission quantum yields (0.76–0.90) and good thermal stability (Td > 400 °C). Complex 3 is an excellent green phosphorescence dopant for OLEDs with efficiency low roll-off (ηL, ηExt(max) = 66.7 cd A−1, 18.2%; ηL, ηExt (1000 m−2) 65.1 17.7%).

The bright white lights: A series of highly robust platinum(II) complexes supported by tetradentate O N C ligands with high emission quantum yields (0.72–0.93) and Td (>400 °C) have been synthesized. Among the complexes, that shown in figure has strong excimer attributed to monomer triplet excited state a localized structure. application this low band-gap material on single-dopant organic or polymer white-light-emitting diodes (WOLED) is highlighted. Intra- intermolecular metal–metal...

Abstract A new series of wide‐bandgap materials, 4‐dipenylphosphine oxide‐4′‐9H‐carbazol‐9‐yl‐tetraphenylsilane (CSPO), 4‐diphenylphosphine oxide‐4′,4″‐di(9H‐carbazol‐9‐yl)‐tetraphenylsilane (pDCSPO), oxide ‐4′‐[3‐(9H‐carbazol‐9‐yl)‐carbazole‐9‐yl]‐tetraphenylsilane (DCSPO), oxide‐4′,4″,4″′‐tri(9H‐carbazol‐9‐yl)‐tetraphenylsilane (pTCSPO) and ‐4′‐[3,6‐di(9H‐carbazol‐9‐yl)‐9H‐carbazol‐9‐yl]‐tetraphenylsilane (TCSPO), containing different ratios linking fashions p‐type carbazole units n‐type...

Structurally robust tetradentate gold(III)-emitters have potent material applications but are rare and unprecedented for those displaying thermally activated delayed fluorescence (TADF). Herein, a novel synthetic route leading to the preparation of highly emissive, charge-neutral [C^C^N^C] gold(III) complexes with 5-5-6-membered chelate rings has been developed through microwave-assisted C-H bond activation. These show high thermal stability emission origin (3 IL, 3 ILCT, TADF) tuned by...

Neutral Cu(I) and Ag(I) complexes with a new rigid tridentate N,P,P ligand (dmpzpp, 3,5-dimethyl-1-(2-((2-(di-o-tolyl)phosphanyl) (o-tolyl)-phosphanyl)phenyl)-1H-pyrazole), giving Cu(dmpzpp)Cl 6, Cu(dmpzpp)Br 7, Cu(dmpzpp)I 8, Cu(dmpzpp)SPh 9, Ag(dmpzpp)I 10 SPh = thiophenylato, were prepared their crystal structures, TD-DFT electronic phosphorescence thermally activated delayed fluorescence (TADF) properties studied in detail. The photoluminescence quantum yields ΦPL of neat powder...

Acceleration of singlet-triplet intersystem crossings (ISC) is instrumental in bolstering triplet exciton harvesting multi-resonance thermally activated delayed fluorescent (MR-TADF) emitters. This work describes a simple gold(I) coordination strategy to enhance the spin-orbit coupling green and blue BN(O)-based MR-TADF emitters, which results notable increase rate constants spectroscopically observed ISC process 3×109 s-1 with nearly unitary quantum yields. Accordingly, resultant...

A critical step in advancing the practical application of copper-based organic light-emitting diodes (OLEDs) is to bridge large gap between device efficiency and operational stability at luminance. Described a panel air- thermally stable two-coordinate CuI emitters featuring bulky pyrazine- (PzIPr) or pyridine-fused N-heterocyclic carbene (PyIPr*) carbazole (Cz) ligands with enhanced amide-Cu-carbene bonding interactions. These display activated delayed fluorescence (TADF) from 1...

Here we describe the synthesis and characterization of a new class dinuclear PtII complexes with blue phosphorescence. Bulky N-heterocyclic carbene tethered bridging ligands were employed to suppress photo-induced structural changes improve thermal stability complexes. These show mixed 3 IL/3 MLCT emission (≈460 nm) quantum yields up 0.95, lifetimes as low 1.3 μs radiative decay rate constants 7.3×105 s-1 in 4 wt % doped PMMA films; latter is attributed 1 excited state having high metal...

Exploitation of next-generation blue light-emitting diodes (LEDs) is the foundation revolution in lighting and display devices. Development high-performance perovskite LEDs still challenging. Herein, 4-aminobenzenesulfonic acid (SA) introduced to passivate CsPbBr3 nanoplates (NPLs), reducing ionic migration via a more stable Pb2+-SO3-- formation, trap state density films shows 50% reduction. The inevitable Br- vacancy defects after multistep washing process can be suppressed by suitable MABr...

Carbene-Au-amide (CMA) type complexes, in which the amide and carbene ligands act as an electron donor (D) acceptor (A), respectively, can exhibit strong delayed fluorescence (DF) from a ligand to charge transfer (LLCT) excited state. Although coplanar donor-acceptor (D-A) conformation has been suggested be crucial factor favoring radiative decay of charge-transfer state, geometric structural underpinning excited-state mechanism CMA complexes remains open question. We herein develop new...

Abstract Herein a class of structurally simple and operationally stable Au(I)‐TADF (TADF = thermally activated delayed fluorescence) materials, based on carbene–metal–amide (CMA) molecular scaffold comprised sterically bulky N ‐heterocyclic carbene ligands with π ‐annulation, are reported. These CMA(Au) emitters stable, adopt coplanar or orthogonal geometry between the amide ligands, show strong blue to deep red TADF emissions (466–666 nm) from equilibrated singlet...

Red electrophosphorescence from light-emitting devices based on two rhenium(I) diimine complexes, (4,4′-dimethyl formate-2,2′-bipyridine)Re(CO)3Cl (dmfbpy-Re) and (4,4′-dibutyl (dbufbpy-Re), is reported. N, N′-di-1-naphthyl-N, N′-diphenylbenzidine used as the hole-transporting layer. 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, bathocuproine to confine excitons within luminescence zone. dmfbpy-Re dbufbpy-Re are doped into host materials (4,4′-N-N′-dicarbazole)biphenyl with mass ratios of...

Abstract Thermally stable, strongly luminescent gold‐TADF emitters are the clue to realize practical applications of gold metal in next generation display and lighting technology, a scarce example which is herein described. A series donor–acceptor type cyclometalated gold(III) alkynyl complexes with some them displaying highly efficient thermally activated delayed fluorescence (TADF) Φ up 88% thin films emission lifetimes ≈1–2 µs at room temperature developed. The color these readily tunable...

Borondipyrromethene (Bodipy) dyes with strong solid-state photoluminescence are highly desirable for their applications in OLEDs. In this work, a series of meso-(4-R–C6H4)-substituted Bodipy (R = H B1; R (OCH2CH2)nOCH2CH3, n 0–3 B2–B5, respectively) were prepared through an acid-catalyzed reaction. The flexible ether groups attached to the periphery B2–B5 expected influence molecular arrangement and intermolecular interactions solid state. Crystallographic analysis B1–B4 reveals that...

Abstract Metal‐TADF (thermally activated delayed fluorescence) emitters hold promise in the development of next generation light‐emitting materials for display and lighting applications, examples which are, however, largely confined to Cu I recently Au , Ag III emitters. Herein is described design strategy an unprecedented type metal‐TADF emitter based on inexpensive tungsten metal chelated with Schiff base ligand that exhibit high emission quantum yields up 56 % solutions 84 thin‐film (5 wt...

In this contribution, recent advances in new classes of efficient metal-TADF complexes, especially those Au(I), Au(III), and W(VI), their application OLEDs are reviewed. The high performance (EQE = 25%) long device operational lifetime (LT95 5,280 h) achieved an OLED with tetradentate Au(III) TADF emitter reflect the competitiveness class emitters for use practical interest. EQE 15.6% solution-processed W(VI) represents alternative direction toward low-cost light-emitting materials. Finally,...