Results 11 to 20 of about 4,707 (158)

Growth and Fabrication of High External Quantum Efficiency AlGaN-Based Deep Ultraviolet Light-Emitting Diode Grown on Pattern Si Substrate [PDF]

Sci Rep, 2017
Growing III-V semiconductor materials on Si substrates for opto-electronic applications is challenging because their high lattice mismatch and different thermal expansion coefficients cause the epitaxial layers to have low quality.
Binh Tinh Tran, Hideki Hirayama
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Light-emitting diodes and photodiodes in the deep ultra-violet range for absorption photometry in liquid chromatography, capillary electrophoresis and gas sensing [PDF]

, 2016
Absorbance measurement in the deep ultra-violet range (below 300 nm) has been one of the most widely used detection methods for analytical techniques as a large number of organic compounds have strong absorption bands in the deep UV region.
Bui, Duy Anh
core   +1 more source

Absorbance based light emitting diode optical sensors and sensing devices [PDF]

, 2008
The ever increasing demand for in situ monitoring of health, environment and security has created a need for reliable, miniaturised sensing devices. To achieve this, appropriate analytical devices are required that possess operating characteristics of ...
O'Toole, Martina, Dermot Diamond, O\u27Toole, Martina, Martina O’Toole, Diamond, Dermot, Martina O’Toole   +5 more
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Formaldehyde sensor using non-dispersive UV spectroscopy at 340nm [PDF]

, 2014
Formaldehyde is a volatile organic compound that exists as a gas at room temperature. It is hazardous to human health causing irritation of the eyes, nose and throat, headaches, limited pulmonary function and is a potential human carcinogen.
Davenport, John, J. J. Davenport, R. P. Tatam, Hodgkinson, Jane, Tatam, Ralph P., J. Hodgkinson, Saffell, John R., J. R. Saffell   +7 more
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Optical gas sensing: a review [PDF]

, 2013
The detection and measurement of gas concentrations using the characteristic optical absorption of the gas species is important for both understanding and monitoring a variety of phenomena from industrial processes to environmental change.
Hodgkinson, Jane, Tatam, Ralph P.
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Origin of defect luminescence in ultraviolet emitting AlGaN diode structures [PDF]

, 2021
Light emitting diode structures emitting in the ultraviolet spectral range are investigated. The samples exhibit defect luminescence bands. Synchrotron-based photoluminescence excitation spectroscopy of the complicated multi-layer stacks is employed to ...
Christoph Reich, Fátima Romero, Goldhahn, Rüdiger, Mehnke, Frank, Markus Weyers, Romero Rojo, María Fátima, Joachim Stellmach, Tim Wernicke, Feneberg, Martin, Romero, Fátima, Rüdiger Goldhahn, Reich, Christoph, Stellmach, Joachim, Kneissl, Michael, Michael Kneissl, Frank Mehnke, Martin Feneberg, Weyers, Markus, Arne Knauer, Wernicke, Tim, Knauer, Arne   +20 more
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Thin-film photonic crystal LEDs with enhanced directionality

, 2010
The use of photonic crystals for light extraction from light-emitting diodes (LEDs) gives the possibility to shape the farfield emission pattern. This is of particular interest for étendue-limited LED applications that require a more directional ...
Bergenek, Krister
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Performance enhancement of ultraviolet light emitting diode incorporating Al nanohole arrays

, 2018
Enhanced photoluminescence and improved internal quantum efficiency were demonstrated for ultraviolet light emitting diodes (UV-LEDs) with Al nanohole arrays deposited on the top surface.
Xie, Weiping, Chee, Kuan W. A., Guo, Wei, Guo, Shiping, Yang, Zhenhai, Xu, Houqiang, Zeng, Yuheng, Ye, Jichun, Jiang, Jie'an   +8 more
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Operation of an optical in-well-pumped vertical-external-cavity surface-emitting laser

, 2006
We report the operation of an optical in-well-pumped vertical-external-cavity surface-emitting laser. The laser delivers 1 W at 855 nm and is pumped with a cost-effective fiber-coupled laser diode emitting at 806 nm.
Ferguson, Allister I., McGinily, Stephen, Schmid, Marc, Ackemann, Thorsten, Zhang, Wei, Riis, Erling   +5 more
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Enhancing the photoluminescence quantum yields of blue-emitting cationic iridium(III) complexes bearing bisphosphine ligands

, 2016
EZ-C acknowledges the University of St Andrews for financial support. We thank Johnson Matthey and Umicore AG for the gift of materials and Cihang Yu for the preparation of isopropxantphos. We thank Dr. Nail Shaveleev for the synthesis of NMS25. IDWS and
Henwood, Adam Francis, Slawin, Alexandra Martha Zoya, Di Mascio, Vincent, Kamer, Paul C J, Samuel, Ifor David William, Bansal, Ashu Kumar, Martínez-Sarti, Laura, Pertegás, Antonio, Bolink, Henk J., Zysman-Colman, Eli, Cordes, David Bradford, Rota Martir, Diego   +11 more
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