Luminescence of ruthenium(II) and osmium(II) polypyridyls in acetonitrile at high pressures

Fetterolf, Monty L.; Offen, H. W.

doi:10.1021/j100261a032

Cited by 33 publications

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“…was checked by means of 1 H and 31 P NMR spectroscopy. 1 H NMR spectrum (ratio of signal intensities for -C 2 H 4 -and CH 2 Cl 2 protons) confirms the presence of CH 2 Cl 2 in agreement with the crystallographic data. 31 P NMR spectrum recorded at 202.45 MHz in CDCl 3 solutions (see Fig.…”

supporting

confidence: 86%

“…Divalent osmium complexes OsðN \ NÞ 2þ 3 with diimine ligands N \ N such as 2,2 0 -bipyridine, 1,10-phenanthroline and their derivatives in general exhibit low emission quantum yields when compared to their RuðN \ NÞ 2þ 3 counterpart [1]. Typically, the emission bands of OsðN \ NÞ 2þ 3 are deeply red-shifted from their Ru(II) analogs and occur in the far-red or near-infrared part of the UV-Vis radiation region.…”

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confidence: 99%

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Os(dppe)(dppe monoxide)(CO)Cl2 as an active intermediate in the synthesis of strongly luminescent divalent osmium complexes

Anastasova

Kapturkiewicz

Nowacki

2005

Inorganic Chemistry Communications

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supporting

confidence: 86%

mentioning

confidence: 99%

Os(dppe)(dppe monoxide)(CO)Cl2 as an active intermediate in the synthesis of strongly luminescent divalent osmium complexes

Anastasova

Kapturkiewicz

Nowacki

2005

Inorganic Chemistry Communications

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“…quantum efficiency of tris(polypyridyl) Os (II) complex ∼ 0.1% [ 151 ] ) and the emission bands in the near-infrared region (750 ∼ 850 nm). In 2002, Dalton and his co-workers took two factors into account to design and synthesize new Os (II) complexes for PhOLEDs.…”

Section: Os (Ii) Complexesmentioning

confidence: 99%

Recent Progresses on Materials for Electrophosphorescent Organic Light‐Emitting Devices

et al. 2010

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Although organic light-emitting devices have been commercialized as flat panel displays since 1997, only singlet excitons were emitted. Full use of singlet and triplet excitons, electrophosphorescence, has attracted increasing attentions after the premier work made by Forrest, Thompson, and co-workers. In fact, red electrophosphorescent dye has already been used in sub-display of commercial mobile phones since 2003. Highly efficient green phosphorescent dye is now undergoing of commercialization. Very recently, blue phosphorescence approaching the theoretical efficiency has also been achieved, which may overcome the final obstacle against the commercialization of full color display and white light sources from phosphorescent materials. Combining light out-coupling structures with highly efficient phosphors (shown in the table-of-contents image), white emission with an efficiency matching that of fluorescent tubes (90 lm/W) has now been realized. It is possible to tune the color to the true white region by changing to a deep blue emitter and corresponding wide gap host and transporting material for the blue phosphor. In this article, recent progresses in red, green, blue, and white electrophosphorescent materials for OLEDs are reviewed, with special emphasis on blue electrophosphorescent materials.

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“…Polypyridine complexes of Ru(II) in polar solvents emit strong metal-to-ligand charge-transfer (CT) phosphorescence even at room temperature, , while most d−d emissions of Cr(III) , and Rh(III) complexes in polar solvent are replaced by ligand-substitution reaction. Shortening of the excited-state lives of various ruthenium(II) compounds at higher temperatures has been ascribed to endoergonic conversion to a higher lying and displaced intermediate such as 3 (d−d) state followed by intersystem crossing to the ground state. − A large activation volume for the nonradiative transition of 3 CT in the solution indicated the formation of a displaced intermediate undergoing efficient transition to the ground state. The deformed emission spectra in the solution phase 2,14-18,20-22 suggest that the molecular structure of the excited ruthenium(II) compound is different from that in the ground state.…”

Section: Introductionmentioning

confidence: 99%

Nonradiative Transition of Phosphorescent Charge-Transfer States of Ruthenium(II)-to-2,2‘-Biquinoline and Ruthenium(II)-to-2,2‘:6‘,2‘‘-Terpyridine in the Solid State

et al. 1998

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Temperature-dependent decays of the charge-transfer triplet excited states (3CT) of ruthenium(II) compounds have been investigated in a wide temperature range (77−480 K) for the crystals of Ru(biq)3(ClO4)2, Ru(bpy)2(biq)X2·2H2O, and Ru(tpy)2X2, (bpy = 2,2‘-bipyridine, tpy = 2,2‘:6‘,2‘‘-terpyridine, biq = 2,2‘-biquinoline, X = ClO4 -, PF6 -). The width of the 1CT absorption band and the peak of 3CT emission of the Ru(bpy)2(biq)X2·2H2O crystal at 298 K are unchanged from those of the ethanol/methanol solution sample. The 3CT of Ru(bpy)2(biq)X2·2H2O and Ru(biq)3(ClO4)2 in the solid state above 370 K are converted to a higher lying excited state, the d−d triplet lowest excited state (3(d−d)), with a frequency factor of >1013 s-1 and an activation energy of >3100 cm-1, followed by the rapid degradation of the higher excited state. A small frequency factor (<1012 s-1) and an activation energy (<2000 cm-1) of the nonradiative decay of 3CT for [Ru(tpy)2]X2 in the solid state indicates that the exoergonic intersystem crossing of 3(d−d) to the ground state is the rate-determining process of 3CT decay above 200 K.

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Luminescence of ruthenium(II) and osmium(II) polypyridyls in acetonitrile at high pressures

Cited by 33 publications

References 0 publications

Os(dppe)(dppe monoxide)(CO)Cl2 as an active intermediate in the synthesis of strongly luminescent divalent osmium complexes

Os(dppe)(dppe monoxide)(CO)Cl2 as an active intermediate in the synthesis of strongly luminescent divalent osmium complexes

Recent Progresses on Materials for Electrophosphorescent Organic Light‐Emitting Devices

Nonradiative Transition of Phosphorescent Charge-Transfer States of Ruthenium(II)-to-2,2‘-Biquinoline and Ruthenium(II)-to-2,2‘:6‘,2‘‘-Terpyridine in the Solid State

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