2,993 research outputs found
Syntheses, Structures, and Electroluminescence of New Blue/Green Luminescent Chelate Compounds: Zn(2-py-in)<sub>2</sub>(THF), BPh<sub>2</sub>(2-py-in), Be(2-py-in)<sub>2</sub>, and BPh<sub>2</sub>(2-py-aza) [2-py-in = 2-(2-pyridyl)indole; 2-py-aza = 2-(2-pyridyl)-7-azaindole]
No full textFour novel blue/green luminescent compounds, Zn(2-py-in)2(THF) (1), BPh2(2-py-in) (2), Be(2-py-in)2 (3), and BPh2(2-py-aza) (4), where 2-py-in = 2-(2-pyridyl)indole and 2-py-aza = 2-(2-pyridyl)-7-azaindole, have been synthesized and fully characterized. The 2-py-in ligand and 2-py-aza ligand in the new
compounds are chelated to the central atom. Compounds 2−4 are air stable and readily sublimable, with a
melting point above 250 °C. In the solid state, compounds 1−4 have an emission maximum at λ 488, 516,
490, and 476 nm, respectively. The structures of compounds 2 and 4 are similar. The blue shift of emission
energy displayed by compound 4, in comparison to that of 2, is attributed to the presence of an extra nitrogen
atom in the 2-py-aza ligand as confirmed by ab initio calculations on compounds 2 and 4. Electroluminescent
devices of compounds 3 and 4 were fabricated by using N,N‘-di-1-naphthyl-N,N‘-diphenylbenzidine (NPB) as
the hole transporting layer, Alq3 (q = 8-hydroxyquinolato) as the electron transporting layer, and compound
3 or 4 as the light emitting layer. At 20 mA/cm2 the EL device of 3 has an external efficiency of 1.06 cd/A
while the EL device of 4 has an external efficiency of 2.34 cd/A, demonstrating that compounds 3 and 4 are
efficient and promising emitters in electroluminescent devices
Ultrasonographic examination of the deltoid ligament in bimalleolar equivalent fractures.
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Performance Enhancement of Conventional Polymer Solar Cells with TTF-py-Modified PEDOT:PSS Film as the Hole Transport Layer
No full textA thin
TTF-py film combined with PEDOT:PSS film was introduced
to enhance the device performance of conventional polymer solar cells.
The origin of the enhanced Jsc and fill
factor was systematically studied by SEM, AFM, contact angle, and
electrochemical impedance spectroscopy measurements. The morphological
improvement of TTF-py-modified film contributed to the decrease of
series loss. In addition, the charge recombination was effectively
suppressed as the interfacial contact of the modified transport layer
with the photoactive layer was enhanced as well. Being consistent
with the hole mobility test results, the calculated effective carrier
mass of TTF-py fitting to the band edge indicates high hole mobility
in the organic molecule direction and organic molecule accumulational
direction. The results indicate a promising approach by inserting
a TTF-py as a modified layer of PEDOT:PSS to promote the performance
of conventional polymer solar cells
Modulation of Gene Expression of Rabbit Chondrocytes by Dynamic Compression in Polyurethane Scaffolds with Collagen Gel Encapsulation
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Dynamic Compression Modulates Chondrocyte Proliferation and Matrix Biosynthesis in Chitosan/Gelatin Scaffolds
No full textAn acidic extracellular pH disrupts adherens junctions in HepG2 cells by Src kinases-dependent modification of E-cadherin.
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