9 research outputs found
Preparation of Three-dimensional Nitrogen-doped Carbon Nanoribbon and Application in Lithium/Sulfur Batteries
No full textImproved cycling stability of the capping agent-free nanocrystalline FeS2 cathode via an upper cut-off voltage control
No full textConfiguration effect of novel bipolar triazole/carbazole-based host materials on the performance of phosphorescent OLED devices
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A series of structurally isomeric carbazole/triazole (TAZ)-based bipolar host materials <strong class="boldFont">1</strong>–<strong class="boldFont">4</strong> were designed and synthesized. These new materials were found to exhibit wide energy gaps (<em>E</em><sub>g</sub>: 3.29–3.52 eV), high triplet energies (<em>E</em><sub>T</sub>: 2.56–2.76 eV), high thermal stability (<em>T</em><sub>d</sub>: 426–454 °C), high glass-transition temperatures (<em>T</em><sub>g</sub>: 116–156 °C) and excellent film-forming property. Green and blue emitting devices with <em>fac</em>-tris(2-phenylpyridine)iridium (Ir(ppy)<sub>3</sub>) and iridium(III) bis(4,6-(di-fluorophenyl)pyridinato-<em>N</em>,C<sup>2′</sup>)picolinate (FIrpic) as phosphorescent dopants have been fabricated. The measurements of turn-on voltages, efficiencies and luminance suggested that the practice of combining carbazole’s high triplet energy and excellent hole-transporting ability with TAZ’s electron-transporting ability at the molecular level was effectively translated into better performance at the device level. The molecular structure of compound <strong class="boldFont">4</strong> is well-correlated with its efficiencies, which (32.7 and 21.1 cd/A for green and blue devices, respectively) were the best among the four materials.</p>
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Synergistic promotion of photoelectrochemical water splitting efficiency of TiO2 nanorods using metal-semiconducting nanoparticles
No full textSubstituent effect of ancillary ligands on the luminescence of bis[4,6-(di-fluorophenyl)-pyridinato-N,C2]iridium(III) complexes
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Two series of (dfppy)<sub><font size="2">2</font></sub>Ir(L<sub><font size="2">N^O</font></sub>) with different substituents were designed and successfully synthesized and the effect of substitution at the ancillary ligand on the photophysical and electrochemical properties of (dfppy)<sub><font size="2">2</font></sub>Ir(L<sub><font size="2">N^O</font></sub>) were investigated. The results indicate that the electron-donating group of –OMe at L<sub><font size="2">N^O</font></sub> increases the PL quantum efficiencies of (dfppy)<sub><font size="2">2</font></sub>Ir(L<sub><font size="2">N^O</font></sub>) and the electron-withdrawing groups of –CF<sub><font size="2">3</font></sub> and –F lower the PL quantum efficiencies.</p>
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High Electroactive Material Loading on a Carbon Nanotube@3D Graphene Aerogel for High-Performance Flexible All-Solid-State Asymmetric Supercapacitors
No full textGraphene quantum dot antennas for high efficiency Forster resonance energy transfer based dye-sensitized solar cells
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