A quantum well intermixing（QW1） investigation on double quantum well（DQW） structure with two different emitting wavelength caused by phosphorus ion implantation and following rapid thermal annealing （RTA） was ca...A quantum well intermixing（QW1） investigation on double quantum well（DQW） structure with two different emitting wavelength caused by phosphorus ion implantation and following rapid thermal annealing （RTA） was carried out by means of photoluminescence（PL）. The ion implantation was performed at the energy of 120 keV with the dose ranging from 1 × 10^11cm^-2 to 1× 10^14cm^-2. The RTA was performed at the temperature of 700 ℃ for 30 s under pure nitrogen protection. The PL measurement implied that the band gap blue-shift from the upper well increases with the ion dose faster than that from lower well and the PL peaks from both QWs remained well separated under the lower dose implantation（-1 × 10^11cm^-2） indicating that the implant vacancy distribution affects the QWl. When the ion dose is over - 1 × 10^12cm^-2, the band gap blue-shift from both wells increases with the ion dose and finally the two peaks merge together as one peak indicating the ion implantation caused a total intermixing of both quantum wells.展开更多
This paper introduces an instrument and method for lamp life test. The design of the instrument is divided into three steps： the oyerall design scheme, hardware circuit design and host machine programming. The instru...This paper introduces an instrument and method for lamp life test. The design of the instrument is divided into three steps： the oyerall design scheme, hardware circuit design and host machine programming. The instrument contains luminance and temperature sensors which can measure luminance of the lamp lighting and environment temperature in the instrument body. Then, the measure data can be transmitted to PC via the wireless transceiver modules for real-time monitoring. The luminance degradation curve based on the measure data is used to reckon the life of the lamp. In the end, the method for processing measurement data is given.展开更多
Using an ab initio total energy and force method, we have relaxed several group IV and group V elementalclusters, in detail the arsenic and antimony dimers, silicon, phosphorus, arsenic and antimony tetramers. The obt...Using an ab initio total energy and force method, we have relaxed several group IV and group V elementalclusters, in detail the arsenic and antimony dimers, silicon, phosphorus, arsenic and antimony tetramers. The obtainedbond lengths and cohesive energies are more accurate than other calculating methods, and in excellent agreement withthe experimental results.展开更多
文摘A quantum well intermixing（QW1） investigation on double quantum well（DQW） structure with two different emitting wavelength caused by phosphorus ion implantation and following rapid thermal annealing （RTA） was carried out by means of photoluminescence（PL）. The ion implantation was performed at the energy of 120 keV with the dose ranging from 1 × 10^11cm^-2 to 1× 10^14cm^-2. The RTA was performed at the temperature of 700 ℃ for 30 s under pure nitrogen protection. The PL measurement implied that the band gap blue-shift from the upper well increases with the ion dose faster than that from lower well and the PL peaks from both QWs remained well separated under the lower dose implantation（-1 × 10^11cm^-2） indicating that the implant vacancy distribution affects the QWl. When the ion dose is over - 1 × 10^12cm^-2, the band gap blue-shift from both wells increases with the ion dose and finally the two peaks merge together as one peak indicating the ion implantation caused a total intermixing of both quantum wells.
基金Sponsored by the Higher School Scientific Research Project Plan of Department of Education of Liaoning Province of China (Grant No. 2009A085)
文摘This paper introduces an instrument and method for lamp life test. The design of the instrument is divided into three steps： the oyerall design scheme, hardware circuit design and host machine programming. The instrument contains luminance and temperature sensors which can measure luminance of the lamp lighting and environment temperature in the instrument body. Then, the measure data can be transmitted to PC via the wireless transceiver modules for real-time monitoring. The luminance degradation curve based on the measure data is used to reckon the life of the lamp. In the end, the method for processing measurement data is given.
基金performed on Cray computers of the Forschungszentrum Jülich, Germany，中国博士后科学基金
文摘Using an ab initio total energy and force method, we have relaxed several group IV and group V elementalclusters, in detail the arsenic and antimony dimers, silicon, phosphorus, arsenic and antimony tetramers. The obtainedbond lengths and cohesive energies are more accurate than other calculating methods, and in excellent agreement withthe experimental results.
