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White light emitting diodes (LEDs) with microstructure array on top surface of the phosphor silicone layer are demonstrated to have enhanced the light extraction efficiency (LEE) compared with white LEDs with flat phosphor layer. The effects of microstructure array on the LEE of LEDs are investigated by ray tracing simulations and experiments. Simulation results reveal that spherical cap microstructure...
The problem of heat dissipation of high power electronics such as IGBT (Insulated Gate Bipolar Transistors) has puzzled us for long time. If the heat generated from the chips could not be eliminated away from the devices, the failure rate would rise rapidly. To deal with this problem, the micro pumps along with the microchannel embedded in the DBC substrate are proposed to remove the heat actively...
Growth of GaN on silicon is investigated to realize semiconductor device on silicon substrate. Our experiment's emphasis is focused on different of structure of interlayer on Si(111) substrate to growth high quality GaN layer. For the large mismatch coefficient between of Si and GaN, which result in the crake and defect. By investigating the different structure, we can draw a conclusion on what kind...
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