Results found: 3

Number of results on page

Search results

Sort By:

Limit search:

Ion Beam Surface Modification of GaN Films for High Efficient Light Emitting Diodes

100%

Wu G., Lin Y., Tu K.

Acta Physica Polonica A

2013

vol. 123

issue 5

884-887

Focused gallium (Ga) ion beam technology has been proposed to modify the surface of GaN thin films. Due to the significant advancement in nitride semiconductors, the solid-state light emitting diodes will gradually replace fluorescent lamps in the next decade. However, further improvements in light extraction and power efficiency are still highly desired. GaN is limited by its high refractive index, with low light escape cone angle at about 24.6°. The external quantum efficiency is low due to the unwanted reflection and absorption. As the patterning technology scales down to the nanometer level, photonic crystal lattice in the visible light wavelength range can be achieved. Therefore, we improved the external efficiency by the new design of hexagonal photonic crystal lattice with air hole arrays in the diameter of 150 nm and the depth of 120 nm. The Ga beam was accelerated at 30 kV and the ion current was 100 pA. The plane wave expansion method along with the finite difference time domain was useful to investigate the quantum confinement. The nanopatterning by the focused ion beam could save time and processing step. In addition, we have successfully prepared blue InGaN/GaN samples with hexagonal period of 200 nm. The device micro-photoluminescence results have demonstrated that the peak illumination intensity was improved by 30%.

Computational Modeling of the Elastic Property of Three-Dimensional Open Cell Foams

100%

Nie Z., Lin Y., Tong Q.

Archives of Metallurgy and Materials

2018

vol. 63

issue 3

Expression of Angiopoietin-1 and the receptor Tie-2 mRNA in rat brains following intracerebral hemorrhage

52%

Zhou H. J., Tang T., Guo C., Zhang H. N., Zhong J. H., Zheng J., Luo J. K., Lin Y., Liu W., Luo W. F., Yang Q. D.

Acta Neurobiologiae Experimentalis

2008

vol. 68

issue 2

147-154

Angiopoietin-1 (Ang-1) belongs to a novel family of endothelial growth factors that function as ligands for an endothelialspecific receptor tyrosine kinase (Tie-2). The Ang-1/Tie-2 system may contribute to angiogenesis and vascular remodeling by mediating interactions of endothelial cells with smooth muscle cells and pericytes. The spatial distribution and temporal expression of Ang-1 and Tie-2 in the rat brain were studied following collagenase-induced intracerebral hemorrhage (ICH), by immunohistochemistry and reverse transcription-polymerase chain (RT-PCR) analysis, respectively. Immunohistochemical analysis revealed that some Ang-1 or Tie-2-positive dilated vessels resided around the hematoma and extended into the clot. RT-PCR analysis showed that Ang-1 and Tie-2 mRNA signal was detected at 2 days and persisted for 28 days after ICH. These findings suggest that ICH could lead to upregulation of Ang-1 and the receptor Tie-2 mRNA.

Refine search results

1 Acta Neurobiologiae Experimentalis

1 Acta Physica Polonica A

1 Archives of Metallurgy and Materials

1 2018

1 2013

1 2008

3 Lin Y.

1 Guo C.

1 Liu W.

1 Luo J. K.

1 Luo W. F.

1 Nie Z.

1 Tang T.

1 Tong Q.

1 Tu K.

1 Wu G.

1 Yang Q. D.

1 Zhang H. N.

1 Zheng J.

1 Zhong J. H.

1 Zhou H. J.

Search results

Ion Beam Surface Modification of GaN Films for High Efficient Light Emitting Diodes

Computational Modeling of the Elastic Property of Three-Dimensional Open Cell Foams

Expression of Angiopoietin-1 and the receptor Tie-2 mRNA in rat brains following intracerebral hemorrhage