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Aiming at exploring the basic functional mechanism of superstrates in the resonant cavity antenna (RCA), two popular superstrates, i.e., the homogeneous dielectric superstrate and the periodic microstrip superstrate are investigated. Their reflection coefficients to normal and oblique plane wave incidences are studied by using mathematical derivation and simulations. Based on it, their effects on...
Polymer based organic photovoltaic systems, which can be mass-produced by roll-to-roll printing technology, hold the promise for a cost-effective, lightweight and mechanical flexible solar energy conversion platform. Nevertheless, challenges still remain for large-scale applications of these flexible solar cells. One of the issues of great importance is the long-time reliability of solar cell module...
Polymer based organic photovoltaic systems, which can be mass-produced by roll-to-roll printing technology, hold the promise for a cost-effective, lightweight and mechanical flexible solar energy conversion platform. Nevertheless, challenges still remain for large-scale applications of these flexible solar cells. One of the issues of great importance is the long-time reliability of solar cell module...
The phenomenon that phosphor particles tend to settle in silicone is widely known. Recent researchers have discussed the effects of phosphor concentration on luminous efficacy of LED packaging. But to produce reliable products, mechanical and interfacial considerations are also essential. In this paper, the mechanical behaviors and interfacial strength of silicone with different levels of phosphor...
Among several materials used in LED packaging, phosphor-filled silicone plays an important role on optical performance and long-time reliability of the module. Many researchers have studied optical properties of phosphor, but few have considered mechanical behavior of phosphor-filled silicone. In this paper, mechanical properties of YAG phosphor-filled silicone are obtained. Tensile tests, which are...
We report a tunable mid-infrared photo-detector based on quantum cascade laser (QCL). The device is biased below and near threshold and it performs as a resonant optical amplifier and at the same time a photo-detector.
Growth quality of quantum-cascade-lasers (QCLs) is difficult to be characterized due to the demanding requirements on hetero-interface quality and thickness control for all >1000 nano-scale superlattice structure. In this work we employ X-ray diffractometry (XRD) to effectively evaluate QCL-wafer growths.
To improve the selectivity of the gas sensor, a practical testing system for testing sensor array and discriminating gases in real-time has been developed. Based on the analysis of the temperature dependence characteristic of the semiconductor sensitive material electric conductivity, the hardware control circuit and the software design method of the testing system were discussed in details. According...
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