Metal chelates as emitting materials for organic electroluminescence

Chen, C.H.; Shi, Jianmin

doi:10.1016/s0010-8545(98)90027-3

Cited by 704 publications

(276 citation statements)

References 22 publications

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“…Luminescent d 10 compounds have received increasing attention over past decades because of their interesting photophysical and photochemical properties and their possible applications in OLED display technology, [1][2][3] as dopant emitters, [4][5][6][7][8] and in sensors for luminescence-based detection of volatile organic compounds. [9][10][11][12] Gold(I) complexes have received considerable attention recently because they exhibit unique features, such as the formation of secondary bonds through aurophilic interactions [13,14] that are similar in strength to hydrogen bonds.…”

Section: Introductionmentioning

confidence: 99%

Highly Luminescent Gold(I)–Silver(I) and Gold(I)–Copper(I) Chalcogenide Clusters

Crespo

Gimeno

Laguna

et al. 2006

Chemistry A European J

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The reactions of [AuClL] with Ag2O, where L represents the heterofunctional ligands PPh2py and PPh2CH2CH2py, give the trigoldoxonium complexes [O(AuL)3]BF4. Treatment of these compounds with thio‐ or selenourea affords the triply bridging sulfide or selenide derivatives [E(AuL)3]BF4 (E=S, Se). These trinuclear species react with Ag(OTf) or [Cu(NCMe)4]PF6 to give different results, depending on the phosphine and the metal. The reactions of [E(AuPPh2py)3]BF4 with silver or copper salts give [E(AuPPh2py)3M]2+ (E=O, S, Se; M=Ag, Cu) clusters that are highly luminescent. The silver complexes consist of tetrahedral Au3Ag clusters further bonded to another unit through aurophilic interactions, whereas in the copper species two coordination isomers with different metallophilic interactions were found. The first is analogous to the silver complexes and in the second, two [S(AuPPh2py)3]+ units bridge two copper atoms through one pyridine group in each unit. The reactions of [E(AuPPh2CH2CH2py)3]BF4 with silver and copper salts give complexes with [E(AuPPh2CH2CH2py)3M]2+ stoichiometry (E=O, S, Se; M=Ag, Cu) with the metal bonded to the three nitrogen atoms in the absence of Au⋅⋅⋅M interactions. The luminescence of these clusters has been studied by varying the chalcogenide, the heterofunctional ligand, and the metal.

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Section: Introductionmentioning

confidence: 99%

Highly Luminescent Gold(I)–Silver(I) and Gold(I)–Copper(I) Chalcogenide Clusters

Crespo

Gimeno

Laguna

et al. 2006

Chemistry A European J

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“…The aluminum complex with a parent compound of 8-quinolinol, [Alq3], has been used as a green light-emitting material. 5 The effects of substituents on the optical performance were studied; [Al(mq)3] was reported to show a blue emission, which was ascribed to an electrondonating methyl group.6 Later, the mixed-ligand complex with Hmq and phenol (PhOH), [Al(mq)2(OPh)], has been proposed as an alternative having a higher chemical stability. 7,8 To explore the further possibility of the Lewis acid-base reactions for the fluorometric detection of anions, we have studied the reactions of these aluminum complexes ([Al(mq) …”

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confidence: 99%

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confidence: 99%

Performance of Tris(2-methyl-8-quinolinolato)aluminum as Fluorescent Anionophore

et al. 2003

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Sensing ions and molecules by fluorescent chemosensors is highly applicable to a wide range of technologies and has currently been studied intensively. 1,2 Lewis acid-base reactions are extensively used as a driving force for the recognition of cations, while hydrogen-bondings are mainly used for the recognition of anions. One application of the Lewis acid-base reactions to anion-sensing is the fluorometric detection of fluoride with boron-containing compounds. 3,4 The high affinity of boron to fluoride and the change in fluorescent characteristics with an increase in coordination number of boron were successfully utilized for the detection of fluoride.The group 13 metal complexes with 8-quinolinol derivatives (Hq: 8-quinolinol, Hmq: 2-methyl-8-quinolinol) have recently been attracting much attention as a component of the organic light-emitting device. The aluminum complex with a parent compound of 8-quinolinol, [Alq3], has been used as a green light-emitting material. 5 The effects of substituents on the optical performance were studied; [Al(mq)3] was reported to show a blue emission, which was ascribed to an electrondonating methyl group.6 Later, the mixed-ligand complex with Hmq and phenol (PhOH), [Al(mq)2(OPh)], has been proposed as an alternative having a higher chemical stability. 7,8 To explore the further possibility of the Lewis acid-base reactions for the fluorometric detection of anions, we have studied the reactions of these aluminum complexes ([Al(mq) Spectroscopic studiesThe solvents were dehydrated with molecular sieves; the residual water concentrations were 10 -2 mol dm -3 for DMSO and DMF and 5 × 10 -2 mol dm -3 for EtOH. -4 mol dm -3 for the others) and anions up to a molar ratio of 9 against Al were prepared, and their spectroscopic properties were evaluated. In the presence of an excess Hmq, the absorbance at 400 nm and the fluorescence at 510 nm with an excitation at 400 nm were monitored to avoid the absorption by Hmq. In the absence of any excess Hmq, the absorbance at 310 and 360 nm and the fluorescence at 480 nm with an excitation at 360 nm were also monitored.The lifetime of photoluminescence was measured with a time-resolved spectroscopic system, PTI-5100S (Photon Technology International).

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“…However, the morphological control of a material by rotational degree of freedom may be more desirable than by vibrational one, since the energy loss via vibrational motions can cause the reduced quantum efficiency as well known in coordination complexes containing luminescent ligands [14]. …”

Section: Resultsmentioning

confidence: 99%

“…Its geometrical molecular structure can result in low photoluminescence (PL) quenching in condensed solid state and good stability against crystallization in amorphous thin films [13]. Therefore, in order to shift the luminance of Alq 3 from green to blue region, as well as improving its efficiency, the 8-hydroxy quinoline ligand on Alq 3 has been modified [14,15].…”

Section: Introductionmentioning

confidence: 99%

Blue electroluminescent aluminum (III) tris[2-(2-hydroxyphenyl)-5-phenyl-1,3-oxazole]

Kim

Murata

Okubo

et al. 2004

Science and Technology of Advanced Materials

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Metal chelates as emitting materials for organic electroluminescence

Cited by 704 publications

References 22 publications

Highly Luminescent Gold(I)–Silver(I) and Gold(I)–Copper(I) Chalcogenide Clusters

Highly Luminescent Gold(I)–Silver(I) and Gold(I)–Copper(I) Chalcogenide Clusters

Performance of Tris(2-methyl-8-quinolinolato)aluminum as Fluorescent Anionophore

Blue electroluminescent aluminum (III) tris[2-(2-hydroxyphenyl)-5-phenyl-1,3-oxazole]

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