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Formation of Ag precipitates in an Al–1wt%Ag alloy after aging at different temperatures was studied by positron annihilation spectroscopy. It is found that the aggregation of Ag atoms takes place during natural aging process after the Al–Ag alloy was homogenized at 550°C and quenched to room temperature water. The Ag nanoclusters could trap positrons and thus positron annihilation measurements give...
In this paper, the reliability and degradation mechanisms of high-brightness LEDs were studied, which were prepared by Cree and currently available on the market. Results revealed that operating currents had an important effect on the service performance of treated LEDs. Only at 350mA the tested LEDs had a good performance; at 750mA and 1000mA, they had the significant degradation; at 2000mA, they...
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