Pure red electroluminescence from novel heteroleptic cyclometalated platinum(II) emitters embedded in polyvinylcarbazole

Tsujimoto, Hidetaka; Sakurai, Yasuhisa; Yagi, Shigeyuki; Honda, Yuichiro; Asuka, Hotaka; Terao, Hiroto; Maeda, Takeshi; Nakazumi, Hiroyuki

doi:10.1016/j.synthmet.2009.12.017

Cited by 11 publications

(16 citation statements)

References 38 publications

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“…4 here. [21,22,[34][35][36][37]; the maximum external quantum efficiency (η ext ) of 4.56% (4.74%), the maximum current efficiency (η j ) of 14.0 cd A -1 (14.2 cd A -1 ), and the maximum power efficiency (η p ) of 4.43 lm W -1 (5.00 lm W -1 ). As expected from the PL spectra, Pt-1c-and Pt-2c-doped devices exhibited the red-shifted EL with the CIE chromaticity coordinates of (0.47, 0.53) and (0.48, 0.52), respectively (@L max ), emitting yellow.…”

Section: Td-dft Studymentioning

confidence: 99%

“…To obtain high performance PLEDs, phosphorescent organometallic complexes such as cyclometalated platinum(II) [10][11][12][13] and iridium(III) [14][15][16][17] complexes have often been employed as emitting dopants because the triplet excitons statistically generated via hole-electron recombination are combined with those from the excited singlet state via efficient intersystem crossing to achieve internal quantum efficiencies up to 100% [18][19][20]. Among them, heteroleptic cyclometalated platinum(II) complexes have been eagerly studied along with heteroleptic bis-and homoleptic tris-cyclometalated iridium(III) complexes, and have often been employed as emitting dopants for PLEDs [21,22]. In general, the platinum(II) complexes adopt four-coordinated planar structures and often form excimers owing to strong intermolecular stacking interaction [10,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Substituent effect on photo- and electroluminescence properties of heteroleptic cyclometalated platinum(II) complexes based on a 2-(dibenzo[b,d]furan-4-yl)pyridine ligand

et al. 2016

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Section: Td-dft Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Substituent effect on photo- and electroluminescence properties of heteroleptic cyclometalated platinum(II) complexes based on a 2-(dibenzo[b,d]furan-4-yl)pyridine ligand

et al. 2016

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“…Thompson et al − proposed soluble materials using heteroleptic ( C ∧ N )Pt(O ∧ O) complexes. These complexes also have considerable advantages in their preparation and have been experimentally investigated by several research groups. − However, systematic theoretical investigations of such soluble phosphorescent materials for OLED devices have not yet been carried out.…”

Section: Introductionmentioning

confidence: 99%

“…The present paper focuses on providing theoretical explanations and suggestions for the design of better phosphorescent platinum complexes, since Yagi et al − recently carried out systematic syntheses of various Thompson-type platinum complexes or heteroleptic ( C ∧ N )Pt(O ∧ O) complexes and reported better materials for red-emission solution-processed OLEDs. In the next section, details of the theoretical methods of calculation are explained.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analyses on Phosphorescent Processes in Pt(thpy)₂ and Its Derivatives

Koseki

Kagita²,

Matsumoto³

et al. 2014

J. Phys. Chem. C

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Theoretical estimation of the peak wavelengths of phosphorescence was performed at the MCSCF+SOCI/SBKJC+p level of theory for several typical platinum complexes in the research field of organic-light-emitting-diodes (OLEDs), where MCSCF+SOCI is the abbreviation of multiconfiguration self-consistent field calculations followed by second-order configuration interaction calculations. The spin–orbit coupling (SOC) integrals among low-lying electronic states of different spin multiplicities were explicitly calculated within the Z eff approximation. By using these computational methods, the experimental results for peak wavelengths of phosphorescence were reasonably explained for cis-bis[2-(2′-thienyl)pyridinato-N,C3′]platinum(II) and its derivatives. The replacement of one of the 2-(2′-thienyl)pyridinate (thpy) ligands by a 2,4-pentanedionate (acac) ligand causes a blue shift of the phosphorescent peak by about 10 nm. The use of a 1,3-bis(phenyl)propane-1,3-dionate (bpp), 1,3-bis(n-methoxyphenyl)propane-1,3-dionate (bmp), or 1,3-bis(3,4-methoxyphenyl)propane-1,3-dionate (bdmp) ligand, instead of an acac ligand, has almost no effect on the peak wavelength of phosphorescence. When a benzene ring is fused to a thpy ligand, the peak wavelength is estimated to be 613 or 651 nm for [2,2′-(4′,5′-benzo)thienyl)pyridinato-N,C3′][1,3-bis(3,4-dibutoxyphenyl)propane-1,3-dionato-O,O]platinum(II) [btpPt(bdbp)] and [1-(2′-thienyl)isoquinolyl-N,C3′][1,3-bis(3,4-dibutoxyphenyl)propane-1,3-dionato-O,O]platinum(II) [1tiqPt(bdbp)], respectively, after correction of the present computational underestimation. These theoretical estimations are in good agreement with the corresponding observations.

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“…On the other hand, phosphorescent materials can harvest both of singlet and triplet excitons that is, ηint of 100 is theoretically possible via intersystem crossing, and thus, the upper limit of ηext of phosphorescent OLEDs is four times more efficient than that of fluorescent OLEDs. With this respect, a lot of efforts have been directed to development of phosphorescent materials suitable as emitters in OLEDs [22][23][24][25][26][27] . In this study, we report the polymer-based light-emitting diode PLED consisting of poly Nvinylcarbazole PVCz doped with bluish green and red phosphorescent Ir III complexes as co-dopants.…”

mentioning

confidence: 99%

White Electroluminescence Obtained from a Polymer Light-Emitting Diode Containing Two Phosphorescent Iridium (III) Complexes in an Emitting Layer

英孝¹,

繁幸²,

茂³

et al. 2010

Journal of the Japan Society of Colour Material

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Aimed at fabrication of a solution-processed white polymer light-emitting diode PLED , novel phosphorescent bis-cyclometalated Ir III complexes were developed bis 2-3,5-bis trifluoromethyl phenyl pyridinato-N,C 2 ' iridium III 2,2,6,6-tetramethylheptane-3,5-dionate-O,O 1 and bis 2-dibenzo b,d furan-4-yl quinolinato-N,C 3 ' iridium III 1,3-bis 3,4-dibutoxyphenyl propane-1,3-dionate-O,O 2. The complex 1 exhibited bluishgreen photoluminescence PL at 475 and 507 nm with a quantum yield ΦPL of 0.91 toluene, rt , and 2 showed red PL at 610 nm with ΦPL of 0.77 toluene, rt. Using these phosphorescent complexes, PVCz-based PLEDs were fabricated PVCz poly N-vinylcarbazole , of which structures were ITO 150 nm /PEDOT PSS 40 nm /PVCz PBD 1 or 2 100 nm /CsF 1.0 nm /Al 250 nm. The PLEDs containing 1 and 2 exhibited bluish-green and red electroluminescence EL , respectively, in similar regions to their PL. These results indicated that the combination of these complexes as co-dopants should yield white luminescence. Indeed, the PLED containing both of 1 and 2 in a PVCz emitting layer was fabricated. When the ratio of PVCz PBD 1 2 was adjusted to 10 3.0 1.2 0.012 wt/wt/wt/wt , white EL with a CIE chromaticity coordinate of 0.364, 0.378 was obtained with maximum luminance of 4200 cd m-2 at 13.0 V, affording maximum current efficiency of 4.9 cd A-1 at 7.0 V, maximum power efficiency of 2.4 lm W-1 at 6.0 V, and maximum external quantum efficiency of 2.4 at 7.0 V.

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Pure red electroluminescence from novel heteroleptic cyclometalated platinum(II) emitters embedded in polyvinylcarbazole

Cited by 11 publications

References 38 publications

Substituent effect on photo- and electroluminescence properties of heteroleptic cyclometalated platinum(II) complexes based on a 2-(dibenzo[b,d]furan-4-yl)pyridine ligand

Substituent effect on photo- and electroluminescence properties of heteroleptic cyclometalated platinum(II) complexes based on a 2-(dibenzo[b,d]furan-4-yl)pyridine ligand

Theoretical Analyses on Phosphorescent Processes in Pt(thpy)₂ and Its Derivatives

White Electroluminescence Obtained from a Polymer Light-Emitting Diode Containing Two Phosphorescent Iridium (III) Complexes in an Emitting Layer

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Pure red electroluminescence from novel heteroleptic cyclometalated platinum(II) emitters embedded in polyvinylcarbazole

Cited by 11 publications

References 38 publications

Substituent effect on photo- and electroluminescence properties of heteroleptic cyclometalated platinum(II) complexes based on a 2-(dibenzo[b,d]furan-4-yl)pyridine ligand

Substituent effect on photo- and electroluminescence properties of heteroleptic cyclometalated platinum(II) complexes based on a 2-(dibenzo[b,d]furan-4-yl)pyridine ligand

Theoretical Analyses on Phosphorescent Processes in Pt(thpy)2 and Its Derivatives

White Electroluminescence Obtained from a Polymer Light-Emitting Diode Containing Two Phosphorescent Iridium (III) Complexes in an Emitting Layer

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Theoretical Analyses on Phosphorescent Processes in Pt(thpy)₂ and Its Derivatives