Abstract
Under different drive current and heat sink temperature,luminous performances as well as physical mechanisms were studied for both traditional phosphor-dispensing packaging white LED and blue light-converting hemisphere remote phosphor LEDs.With the increase of the heat sink temperature and the drive currents,the quantum efficiency and light conversion efficiency in the traditional phosphor-dispensing packaging white LED drop rapidly,which is responsible for the decrease of Y/B ratio(Yellow/Blue Ratio) and the apparent increase of CCT(correlated color temperature).However,the parameters of quantum efficiency,light conversion efficiency and CCT in blue light-converting hemisphere remote-phosphor packaging LEDs have little change under the same experimental conditions.In addition,the remote phosphor LEDs exhibit a batwing spatial luminous intensity distribution and the spatial Y/B ratio distribution is much more homogeneous compared with the traditional phosphor-dispensing packaging white LED.
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