Synthesis and high-resolution optical spectroscopy of bis[2-(2-thienyl)pyridinato-C3,N'](2,2'-bipyridine)iridium(III)

Colombo, Mirco G.; Guedel, Hans U.

doi:10.1021/ic00066a019

Cited by 172 publications

(117 citation statements)

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“…Generally, for mixed-ligand cationic iridium complexes, three excited states contribute to the observed light emission, that is, LC 3 p-p Ã , 3 MLCT, and 3 LLCT. [32][33][34] At room temperature, all complexes except 4 and 6 display broad and almost featureless emission spectra in CH 3 CN solutions, CH 2 Cl 2 solutions, and in neat films (Supporting Information, Fig. S1 and S2), which indicates that the emissive excited states of complexes 1-3 and 5 have predominantly characters of 3 MLCT or 3 LLCT other than LC 3 p-p Ã , as the latter always show vibronically structured emission spectra.…”

Section: Synthesis and Characterizationmentioning

confidence: 97%

“…S1 and S2), which indicates that the emissive excited states of complexes 1-3 and 5 have predominantly characters of 3 MLCT or 3 LLCT other than LC 3 p-p Ã , as the latter always show vibronically structured emission spectra. [32,34] For complex 4, a small vibronic structure develops in the emission spectra, which forms two emission peaks of nearly equal height in the case of CH 3 CN solutions. For complex 6, the emission spectra in solutions, although featureless, are narrower compared with those of others ( Fig.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…This indicates that, at room temperature, the emissive excited states of complexes 4 and 6 have much more characters of LC 3 p-p Ã than other complexes. [32,34] Upon cooling the solutions to 77 K, the emission spectra of the complexes are much more structured and largely blueshifted (Fig. S3, Supporting Information), which indicates that, at low temperatures, considerable LC 3 p-p Ã characters develop in the emissive excited states of the complexes.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…S3, Supporting Information), which indicates that, at low temperatures, considerable LC 3 p-p Ã characters develop in the emissive excited states of the complexes. [15,32,34] In CH 3 CN solution, [Ir(ppy) 2 (pyim)]PF 6 (1) has a featureless emission spectrum centered at 554 nm, which is blueshifted by nearly 30 nm compared with that of the typical cationic iridium complex [Ir(ppy) 2 (dtb-bpy)]PF 6 (581 nm) (dtb-bpy is 4,4 0 -di-tertbutyl-2,2 0 -bipyridine). [12] When 1,1 0 -dimethyl-1H,1 0 H-2,2 0 -biimidazole (Bid) is used as the ancillary ligand (complex 6), the blueshift (85 nm) of the emission spectra is even more obvious.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

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Toward Highly Efficient Solid‐State White Light‐Emitting Electrochemical Cells: Blue‐Green to Red Emitting Cationic Iridium Complexes with Imidazole‐Type Ancillary Ligands

Qiao

Duan

et al. 2009

Adv Funct Materials

305

258

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Using imidazole‐type ancillary ligands, a new class of cationic iridium complexes (1–6) is prepared, and photophysical and electrochemical studies and theoretical calculations are performed. Compared with the widely used bpy (2,2′‐bipyridine)‐type ancillary ligands, imidazole‐type ancillary ligands can be prepared and modified with ease, and are capable of blueshifting the emission spectra of cationic iridium complexes. By tuning the conjugation length of the ancillary ligands, blue‐green to red emitting cationic iridium complexes are obtained. Single‐layer light‐emitting electrochemical cells (LECs) based on cationic iridium complexes show blue‐green to red electroluminescence. High efficiencies of 8.4, 18.6, and 13.2 cd A−1 are achieved for the blue‐green‐emitting, yellow‐emitting, and orange‐emitting devices, respectively. By doping the red‐emitting complex into the blue‐green LEC, white LECs are realized, which give warm‐white light with Commission Internationale de L'Eclairage (CIE) coordinates of (0.42, 0.44) and color‐rendering indexes (CRI) of up to 81. The peak external quantum efficiency, current efficiency, and power efficiency of the white LECs reach 5.2%, 11.2 cd A−1, and 10 lm W−1, respectively, which are the highest for white LECs reported so far, and indicate the great potential for the use of these cationic iridium complexes in white LECs.

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Section: Synthesis and Characterizationmentioning

confidence: 97%

Section: Synthesis and Characterizationmentioning

confidence: 99%

Section: Synthesis and Characterizationmentioning

confidence: 99%

Section: Synthesis and Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Toward Highly Efficient Solid‐State White Light‐Emitting Electrochemical Cells: Blue‐Green to Red Emitting Cationic Iridium Complexes with Imidazole‐Type Ancillary Ligands

Qiao

Duan

et al. 2009

Adv Funct Materials

305

258

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“…In acetonitrile solution at room temperature 1 is an orange-yellow emitter [18][19][20]. The spin density of the triplet state is thus delocalized over the entire complex (Fig.…”

Section: Photophysicsmentioning

confidence: 99%

Luminescent Iridium Complexes Used in Light-Emitting Electrochemical Cells (LEECs)

Henwood

Zysman‐Colman

2016

Topics in Current Chemistry Collections

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Syntheses, Electronic Absorption, Emission, and Ion-Binding Studies of Platinum(II) C^N^C and Terpyridyl Complexes Containing Crown Ether Pendants

et al. 2002

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A series of platinum (II) C^N^C complexes, [Pt(C^N^C) (L)] (HC^N^CH=2,6‐diphenylpyridine (dppy); L=Ph2PB15C5 (1, B15C5=benzo[15]crown‐5), Ph2PDMP (2, DMP=3,4‐dimethoxyphenyl), pyCOA15C5 (3, A15C5=aza[15]crown‐5), pyCON(CH2CH2OCH3)2 (4), pyCCB15C5 (5), pyCCDMP (6)) and terpyridyl complexes, [Pt(trpy)(L)](X)2 (trpy=2,2′:6′,2″‐terpyridine; L=Ph2PB15C5, X=OTf (7 a), PF6 (7 b); X=PF6, L=Ph2PDMP (8), pyCCB15C5 (9), and pyCCDMP (10)) have been successfully synthesized and characterized. The structures of 1, 3, and 7 a have been determined by X‐ray crystallography. Excitation of complexes 1–6 in EtOH/MeOH (4:1 v/v) glass gave high‐energy structured emission bands, assigned as derived from states of metal‐perturbed intraligand (IL) origin. At higher concentrations, complexes 3–6 each displayed an additional, structureless emission band at 600–615 nm, with complexes 5 and 6 showing an obvious increase in the intensity of this emission band when the concentration was increased further. In dichloromethane at room temperature, complexes 3–6 showed, in addition to the high‐energy emission at 490–505 nm, an extra, broad emission band at 620–625 nm when the concentration was increased. The emission origins of the low‐energy band in glass and in fluid solutions are suggested to be derived from the ground‐state oligomerization or aggregation process of the complexes. In the solid state at room temperature, complexes 1–6 each showed a broad, unstructured emission band at 560–600 nm, which was shifted to lower energy upon cooling to 77 K. On the other hand, the terpyridyl analogues 7–10 displayed intense vibronic‐structured intraligand (IL) emissions at 460–472 nm in butyronitrile glass at 77 K. Solid‐state samples of 9 and 10 displayed strong phosphorescence upon photoexcitation at 298 K and 77 K, tentatively assigned as derived from states of Pt(dπ)→π*(trpy) 3MLCT origin(MLCT=metal‐to‐ligand charge transfer). The ion‐binding properties of complexes 5 and 9 for Na+, Ba2+, and K+ ions have been studied by UV/Vis spectrophotometric methods, and confirmed by ESI mass spectrometric studies. The ion‐binding properties for Na+ ions have also been probed by 1H NMR experiments. For the same crown ether‐containing ligand and the same metal ions, the neutral cyclometalated complexes gave larger binding constants than the positively charged terpyridyl analogues.

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Synthesis and high-resolution optical spectroscopy of bis[2-(2-thienyl)pyridinato-C3,N'](2,2'-bipyridine)iridium(III)

Cited by 172 publications

References 0 publications

Toward Highly Efficient Solid‐State White Light‐Emitting Electrochemical Cells: Blue‐Green to Red Emitting Cationic Iridium Complexes with Imidazole‐Type Ancillary Ligands

Toward Highly Efficient Solid‐State White Light‐Emitting Electrochemical Cells: Blue‐Green to Red Emitting Cationic Iridium Complexes with Imidazole‐Type Ancillary Ligands

Luminescent Iridium Complexes Used in Light-Emitting Electrochemical Cells (LEECs)

Syntheses, Electronic Absorption, Emission, and Ion-Binding Studies of Platinum(II) C^N^C and Terpyridyl Complexes Containing Crown Ether Pendants

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