Electroluminescent characteristics of OLEDs fabricated with bis(5,7-dichloro-8-hydroxyquinolinato)zinc(II) as light emitting material

Sharma, Ashish Kumar; Singh, Devender; Makrandi, J. K.; Kamalasanan, M. N.; Shrivastva, Ritu; Singh, Ishwar

doi:10.1016/j.matlet.2007.02.078

Cited by 37 publications

(16 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1,2 8-Hydroxyquinoline metal chelates are presently considered to be one of the most reliable electrotransporting and emitting materials applied in molecular-based OLEDs for their thermal stability, high fluorescence, and excellent electron-transporting mobility. [6][7][8] Furthermore, by combining an efficient hole-transport unit, including carbazole and triphenylamine units, single-layer devices with good carrier-transporting behaviors can be easily realized. Thus, zinc complexes may be potential candidates to enhance the electron-transporting properties for OLEDs.…”

Section: Introductionmentioning

confidence: 99%

Comparative studies on OLED performances of chloro and fluoro substituted Zn(ii) 8-hydroxyquinolinates

Huo

et al. 2015

New J. Chem.

View full text Add to dashboard Cite

Two novel 8-hydroxyquinoline metallic derivatives, (E)-2- [(2,3,4,5-tetrafluorophenyl)ethenyl]-8-hydroxyquinolate zinc (5) and (E)-2-[2-(2,6-dichlorophenyl)ethenyl]-8-hydroxyquinolate zinc (6) were synthesized and characterized by 1 H NMR, ESI-MS, FT-IR and elemental analysis. Photoluminescence spectra revealed that the complexes showed strong fluorescence with maximum emissions at 575 and 607 nm. Compared with that of complex 5, the fluorescence quantum yield and average fluorescence lifetime of complex 6were efficiently reduced. The heavy atom effect of Cl and distinct molecular interactions were found to play an important role in modulating or improving the properties of the complexes. Multilayer organic light-emitting diodes (OLEDs) were fabricated using these complexes. The results show they are good candidates for yellow OLEDs with maximum luminance of 7123 cd m À2 for compound 5 and 9143 cd m À2 for compound 6, as well as luminance efficiencies of 2.26 cd A À1 and 2.60 cd A À1 , respectively. As the substituents are changed from fluorine to chlorine, the organic electroluminescent device based on the complex 6 shows overall better performance than that of complex 5. The calculated HOMO-LUMO energy gaps for complexes 5 and 6 were in good agreement with the experimental results.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparative studies on OLED performances of chloro and fluoro substituted Zn(ii) 8-hydroxyquinolinates

Huo

et al. 2015

New J. Chem.

View full text Add to dashboard Cite

show abstract

“…The electroluminescent devices based on Be(II) complexes have brighter luminance than devices fabricated with other similar metal complexes [14]. There was shift in emission wavelength on attaching electron withdrawing groups on phenol ring as in quinolate complexes [19,20]. Blue shift in emission wavelength of [BeHPB(Clq)] and [BeHPB(Meq)] was observed as compared to that of [BeHPB(q)].…”

Section: Optical Absorption and Photoluminescent Spectramentioning

confidence: 93%

“…This was due to attaching of electron withdrawing groups, that is, chloro at phenolic ring, and electron donating groups, that is, methyl at pyridyl ring. The highest occupied molecular orbitals (HOMOs) and lowest unoccupied molecular orbitals (LUMOs) in 8-hydroxyquinoline were present on phenoxide ring and pyridyl ring, respectively [21]. The central metal atom provided stability to the ligands and modification of ligands lead to change in emission wavelength as well as energy.…”

Section: Optical Absorption and Photoluminescent Spectramentioning

confidence: 99%

Synthesis and Optical Characterization of Mixed Ligands Beryllium Complexes for Display Device Applications

Nishal

Singh

Saini

et al. 2015

International Journal of Optics

View full text Add to dashboard Cite

Synthesis and photoluminescent behaviour of mixed ligand based beryllium complexes with 2-(2-hydroxyphenyl)benzoxazole (HPB) and 5-chloro-8-hydroxyquinoline (Clq) or 5,7-dichloro-8-hydroxyquinoline (Cl2q) or 2-methyl-8-hydroxyquinoline (Meq) or 8-hydroxyquinoline (q) are reported in this work. These complexes, that is, [BeHPB(Clq)], [BeHPB(Cl2q)], [BeHPB(Meq)], and [BeHPB(q)], were prepared and their structures were confirmed by elemental analysis, Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, and thermal analysis. The beryllium complexes exhibited good thermal stability up to ~300°C temperature. The photophysical properties of beryllium complexes were studied using ultraviolet-visible absorption and photoluminescence emission spectroscopy. The complexes showed absorption peaks due toπ-π∗andn-π∗electronic transitions. The complexes emitted greenish blue light with peak wavelength at 496 nm, 510 nm, 490 nm, and 505 nm, respectively, consisting of high intensity. Color tuning was observed with changing the substituents in quinoline ring ligand in metal complexes. The emitted light had Commission Internationale d’Eclairage color coordinates values atx=0.15andy=0.43for [BeHPB(Clq)],x=0.21andy=0.56for [BeHPB(Cl2q)],x=0.14andy=0.38for [BeHPB(Meq)],x=0.17andy=0.41for [BeHPB(q)]. Theoretical calculations using DFT/B3LYP/6-31G(d,p) method were performed to reveal the three-dimensional geometries and the frontier molecular orbital energy levels of these synthesized metal complexes.

show abstract

“…organic light emitting diodes (OLED), optoelectronic devices [1][2][3][4], imaging with radionuclides [5], pharmaceutics, drugs in cancer treatment such as tumor growth inhibitors [6,7] and neurodegenerative disorders [8]). Zinc complexes with 8-hydroxyquinoline, which is the most widely used electron-transporting material in OLEDs, may enhance electron-transporting for OLEDs [9,10].…”

Section: Introductionmentioning

confidence: 99%

Two 5-tetrazolylazo-8-hydroxyquinoline-based Zn(II) and Mn(II) complexes: syntheses, structures and optical properties

Qiu

Lin

et al. 2015

Journal of Coordination Chemistry

View full text Add to dashboard Cite

Two 5-tetrazolylazo-8-hydroxyquinoline (TTHQ) Zn 2+ and Mn 2+ complexes, [Zn(TTHQ)(en)]·2H 2 O (en = ethylenediamine) (1) and [Mn 2 (TTHQ) 2 (H 2 O) 6 ]·2H 2 O (2), were synthesized and characterized by single-crystal X-ray diffraction analysis. Stacking (π-π) and hydrogen-bonding interactions are responsible for the stabilization of the supramolecular structures. UV-vis spectral changes and photoluminescent properties of TTHQ, 1 and 2 were investigated and a red emission was found. The hydrogen-bonding interaction energies in 1 and 2 were calculated using density functional theory at the WB97XD/6-31++G level.

show abstract

Electroluminescent characteristics of OLEDs fabricated with bis(5,7-dichloro-8-hydroxyquinolinato)zinc(II) as light emitting material

Cited by 37 publications

References 15 publications

Comparative studies on OLED performances of chloro and fluoro substituted Zn(ii) 8-hydroxyquinolinates

Comparative studies on OLED performances of chloro and fluoro substituted Zn(ii) 8-hydroxyquinolinates

Synthesis and Optical Characterization of Mixed Ligands Beryllium Complexes for Display Device Applications

Two 5-tetrazolylazo-8-hydroxyquinoline-based Zn(II) and Mn(II) complexes: syntheses, structures and optical properties

Contact Info

Product

Resources

About