Highly efficient blue–green neutral dinuclear copper(I) halide complexes containing bidentate phosphine ligands

Xiao, Hong; Wang, Bo; Liu, Li; Zhong, Xin; Li, Fa Bao; Wang, Lei; Wong, Wai Yeung; Qin, Hai Mei; Lo, Yih Hsing

doi:10.1016/j.jlumin.2016.08.004

Cited by 45 publications

(13 citation statements)

References 55 publications

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“…Most of these are neutral and are of interest for OLEDs; selected examples which have been tested in OLED configurations are shown in Scheme 3. 36,64–96…”

Section: The Tadf Era In Cu-itmcs Beginsmentioning

confidence: 99%

TADF: Enabling luminescent copper(i) coordination compounds for light-emitting electrochemical cells

Housecroft

Constable

2022

J. Mater. Chem. C

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“…Most of these are neutral and are of interest for OLEDs; selected examples which have been tested in OLED configurations are shown in Scheme 3. 36,64–96…”

Section: The Tadf Era In Cu-itmcs Beginsmentioning

confidence: 99%

TADF: Enabling luminescent copper(i) coordination compounds for light-emitting electrochemical cells

Housecroft

Constable

2022

J. Mater. Chem. C

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“…Dinuclear Cu(I) cores possess a great advantage over mononuclear core since they have a rigid structure and thus high efficiency recorded for bulky ligand chelated complexes. − However, the reported dinuclear Cu(I) halide complexes are mainly limited to bidendate diphoshines ,− or imine and phosphine ,− ,− ligands, whereas bidentate amine and phosphine ligands are rarely reported. In comparison to the great success in green emitters, it seems that blue emitters are still a challenge to meet the requirement of full color displays and white light sources. , …”

Section: Introductionmentioning

confidence: 99%

Largely Color-Tuning Prompt and Delayed Fluorescence: Dinuclear Cu(I) Halide Complexes with tert-Amines and Phosphines

Chen

Yang

et al. 2021

Inorg. Chem.

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Luminescent copper(I) halide complexes with bi- and tridentate rigid ligands have gained wide research interests. In this paper, six tetracoordinate dinuclear copper(I) halide complexes, Cu2X2(ppda)2 [ppda = 2-[2-(dimethylamino)phenyl(phenyl)phosphino]-N,N-dimethylaniline, X = I (1), Br (2), Cl (3)] and Cu2X2(pfda)2 [pfda = 2-[2-(dimethylamino)-4-(trifluoromethyl)phenyl(phenyl)phosphino]-N,N-dimethyl-5-trifluoromethylaniline, X = I (4), Br (5), Cl (6)], were successfully prepared and systematically characterized on their structures and photophysical properties. Complexes 1–5 have a centrosymmetric form with a planar Cu2X2 unit, and complex 6 has a mirror symmetry form with a butterfly-shaped Cu2X2. Solid complexes 1, 4, and 5 emit delayed fluorescence at room temperature, intense blue to greenish yellow (λmax = 443–570 nm) light, and their peak wavelengths are located at 443–570 nm with microsecond lifetimes (τ = 0.4–19.2 μs, ΦPL = 0.05–0.48). Complexes 2, 3, and 6 show prompt fluorescence, very weak yellowish green to yellow (λmax = 534–595 nm) emission with peak wavelengths at 534–595 nm, and lifetimes in nanoseconds (τ = 4.4–9.3 ns, ΦPL < 0.0001). (Metal + halide) to ligand and intraligand charge transitions are the main origin of the emission of the complexes. Solution-processed, complex-4-based nondoped and doped devices emit yellow green light with CIE coordinated at (0.41, 0.51), a maximum EQE up to 0.17%, and luminance reaching 75.52 cd/m2.

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“…[21][22][23] (ii) Compounds that show thermally activated delayed fluorescence (TADF) harvest also all excitons, but the emission occurs essentially via the thermally activated singlet state S1. [24][25][26][27][28] Development of TADF compounds is currently under heavy research, since such materials can be realized with low-cost and environmentally friendly Cu(I) complexes 9, 24,25,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] as well as with purely organic molecules. 26,45,46 For organotransition metal compounds, the occurrence of TADF is crucially related to metal-toligand charge transfer (MLCT) states having frontier orbitals, HOMO and LUMO, that are spatially well separated.…”

Section: Introductionmentioning

confidence: 99%

Design Strategy for Ag(I)-Based Thermally Activated Delayed Fluorescence Reaching an Efficiency Breakthrough

et al. 2017

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A design strategy is presented for the development of Ag(I)-based materials for thermally activated delayed fluorescence (TADF). Although Ag(I) complexes usually do not show TADF, the designed material, Ag(dbp)(P2-nCB) (with dbp = 2,9-din -butyl-1,10-phenanthroline and P2-nCB = nido-carborane-bis-(diphenylphosphine)), shows a TADF efficiency breakthrough exhibiting an emission decay time of τ(TADF) = 1.4 µs at a quantum yield of ΦPL = 100 %. This is a consequence of three optimized parameters: (i) The strongly electron-donating negatively charged P2-nCB ligand destabilizes the 4dorbitals and leads to low lying charge (CT) states of MLL'CT character, with L and L' being the two different ligands, thus, giving a small energy separation between the lowest singlet S1 and triplet T1 state of ∆E(S1-T1) = 650 cm 1 (80 meV). (ii) The allowedness of the S1→S0 transition is more than one order of magnitude higher than found for other TADF metal complexes, as shown experimentally and by TD-DFT calculations. Both parameters favor short TADF decay time. (iii) The high quantum efficiency is dominantly related to the rigid molecular structure of Ag(dbp)(P2-nCB), resulting from the design strategy of introducing n-butyl substitutions at the 2,9positions of phenanthroline which sterically interact with the phenyl groups of the P2-nCB ligand. In particular, the shortest TADF decay time of τ(TADF) = 1.4 µs at ΦPL = 100 % reported so far suggests the use of this outstanding material for OLEDs.

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Highly efficient blue–green neutral dinuclear copper(I) halide complexes containing bidentate phosphine ligands

Cited by 45 publications

References 55 publications

TADF: Enabling luminescent copper(i) coordination compounds for light-emitting electrochemical cells

TADF: Enabling luminescent copper(i) coordination compounds for light-emitting electrochemical cells

Largely Color-Tuning Prompt and Delayed Fluorescence: Dinuclear Cu(I) Halide Complexes with tert-Amines and Phosphines

Design Strategy for Ag(I)-Based Thermally Activated Delayed Fluorescence Reaching an Efficiency Breakthrough

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