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A simulated model consists of chip-on-board (COB) packaged light emitting diode (LED) array with silicon resin based optical component was built. The principle of the simulation was to investigate the roles of optical component feature play in light extraction efficiency (LEE) by adjusting shape and size of the component to obtain maximum optical output power. Since cylinder resin based optical component...
This paper studies a new type of solar spectral fitting technique based on LED. Firstly, Using the light collecting equipment collected several typical periods of the solar spectrum of Beijing. And then, After a preliminary analysis, five specific bands LEDs are used to fit the target solar spectrum. Among them, the use of two pieces of normal white light LEDs, a single LED with 480nm wavelength,...
The degradation behaviors of GaN-based LEDs encapsulated with different phosphors were studied. The results of the aging experiments show that the yellow phosphor is the most stable phosphor, although the green and red phosphors can help to improve the color quality, they strongly influence the reliability. Comparing the accelerating factors, such as the aging temperature and relatively humidity,...
In order to study the impact of die attach materials in HP LEDs, A 3-D model was established by TracePro and Ansys and two samples were fabricated with Silver epoxy and Insulation paste as the layer of die attach, respectively. The light output powers of sample1and sample2 were 295.1mW and 316.4mW at 350 mA, respectively. The light output power of sample2 using Insulation paste was 7% higher than...
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