Simple and High Efficiency Phosphorescence Organic Light-Emitting Diodes with Codeposited Copper(I) Emitter

Liu, Zhiwei; Qiu, Jacky; Wei, Feng; Wang, Jianqiang; Helander, Michael G.; Rodney, Sarah; Wang, Zhibin; Bian, Zuqiang; Lu, Zheng‐Hong; Thompson, Mark E.; Huang, Chunhui

doi:10.1021/cm5006086

Cited by 111 publications

(81 citation statements)

References 37 publications

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“…35,36 The HOMOs of these complexes were lowered down by the electron decient POP. [48][49][50][51][52] Cationic emissive Cu(I) complexes are more stable and their emission would be easily adjusted. 37,38 Although neutral Cu(I) complexes without small counterions achieve higher device performance than those with counterions, 39-44 these complexes containing N À -ligands and halogen counterions have much lower stability [45][46][47] or are more difficult to adjust the emission spanning the whole visible region.…”

Section: Introductionmentioning

confidence: 99%

Four highly efficient cuprous complexes and their applications in solution-processed organic light-emitting diodes

Zhang

Chen

et al. 2015

RSC Adv.

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Four mononuclear cationic Cu(I) complexes featuring functional C-linked pyrazolyl pyridine diimine ligands have been synthesized and characterized. Under UV 365 nm at room temperature, these complexes emit similar orange light in solution and green light in thin film, which could be attributed to the limited charge and steric influence of these methyl or trifluoromethyl substituted phenyl appendages at the pyrazol ring.Moreover, multilayer organic light-emitting diodes (OLEDs) based on these Cu(I) complexes had different performance efficiencies. The device with complex 1 as the light emitting material had the highest current efficiency of 17.8 cd A À1 and an external quantum efficiency (EQE) of 6.4%, while the device with complex 2 which shows the highest photoluminescence quantum yields gave the poorest device efficiency with a current efficiency of 13 cd A À1 and an EQE of 4.7%.

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Section: Introductionmentioning

confidence: 99%

Four highly efficient cuprous complexes and their applications in solution-processed organic light-emitting diodes

Zhang

Chen

et al. 2015

RSC Adv.

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“…The thickness of the PPP films can be modulated by controlling polymerization time. The monomer of PPN, CBP, was synthesized according to reference[27] and PPN films…”

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confidence: 99%

High-performance hybrid perovskite solar cells with open circuit voltage dependence on hole-transporting materials

et al. 2015

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“…[1][2][3][4][5] They are easily synthesized 6,7 and tunable in emission color, [8][9][10] with high emission quantum yields in the solid state. 7,10,11 Copper(I) halide compounds can be considered as a valid alternative to luminescent metal complexes of precious (i.e.…”

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confidence: 99%

Dual luminescence in solid CuI(piperazine): hypothesis of an emissive 1-D delocalized excited state

Maini

Braga

Mazzeo³

et al. 2015

Dalton Trans.

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Solid [CuI( piperazine) 0.5 ] ∞ , characterized by a structure with an infinite double chain of CuI, presents an unexpected dual luminescence. The short copper-copper distances allow the existence of both cluster-centered and 1-D delocalized electronic transitions, as emerged from theoretical calculations. Beyond the more common cluster-centered emission a higher energy band, which differs in lifetime and in temperature dependence, is observed.One of the most prominent classes of luminescent coordination compounds is that of copper(I) halides, due to their promising features for application in the field of optoelectronics. [1][2][3][4][5] They are easily synthesized 6,7 and tunable in emission color, [8][9][10] with high emission quantum yields in the solid state. 7,10,11 Copper(I) halide compounds can be considered as a valid alternative to luminescent metal complexes of precious (i.e. Ir or Os) and rare earth metals, which are expensive and environmentally problematic. 12 The luminescence properties of the copper halide clusters arise from a remarkable variety of emissive states, which have been extensively investigated in the last 30 years and can be summarized as follows: (a) a low-energy emission, attributed to a triplet cluster-centered ( 3 CC) excited state, is observed in the case of metal center interactions [13][14][15][16][17][18][19] and is independent of the nature of the ligand engaged in the complex; (b) a highenergy emission, attributed to a triplet halide-to-ligand charge transfer ( 3 XLCT) excited state, may show up in the presence of unsaturated ligands with accessible π-orbitals. 20 Moreover, recent studies have shown that several copper compounds present a thermally activated delayed fluorescence (TADF): Cu(I) halide-bridged compounds with P^N ligands are characterized by (metal + halide)-to-ligand charge transfer ((M + X) LCT) excited states where the low singlet-triplet energy gap allows emission from both the singlet and the triplet excited states, depending on the temperature. [21][22][23] The structure of [CuI( piperazine) 0.5 ] ∞ 24 is characterized by a one-dimensional copper iodide polymeric structure. The infinite double chain of CuI is described as castellated, 25 as shown in Fig. 1a, and the tetrahedral coordination of the copper(I) ions is fulfilled by the bridging piperazine to construct a 3D network (Fig. 1b and c). The inorganic chain is generated by the sequence of an inversion center and 2-fold axis symmetry elements, thus two different copper distances are present (2.771(1) Å and 2.729(1) Å). Although the presence of infinite double chain motifs has been observed in 20 struc-

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Simple and High Efficiency Phosphorescence Organic Light-Emitting Diodes with Codeposited Copper(I) Emitter

Cited by 111 publications

References 37 publications

Four highly efficient cuprous complexes and their applications in solution-processed organic light-emitting diodes

Four highly efficient cuprous complexes and their applications in solution-processed organic light-emitting diodes

High-performance hybrid perovskite solar cells with open circuit voltage dependence on hole-transporting materials

Dual luminescence in solid CuI(piperazine): hypothesis of an emissive 1-D delocalized excited state

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