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The effect of pyramidal multilayer phosphor layout on the color uniformity of white light-emitting diodes is analyzed, using the Monte Carlo ray-tracing optical simulation. The color uniformity has been improved by tailoring the number of layers, the pyramidal shape, and the phosphor concentration distribution. Results show that Layout C, with five layers(More)
Effects of YAG: Ce phosphor particle size on the luminous flux and angular color uniformity have been studied by using Monte Carlo ray-tracing simulation. A white LED model basing on Cree XLamp is constructed. The phosphor particle size is changed from 2 to 20 μm. Different simulation cases are carried out by changing the phosphor concentration and(More)
Although the optical simulations have been widely adopted to study phosphor-converted light-emitting diodes (pcLEDs), to the best of our knowledge, there is no study that investigates the pcLED model considering the effect of phosphor particles with irregular shapes. In order to explore this topic, we employ the finite-difference time-domain method to(More)
YAG: Ce phosphor is widely used in LED industry with powder form to mix with silicone. The phosphor particle size is important by affecting optical performance of white LEDs in terms of luminous flux and angular color uniformity. This paper constructed a white LED optical model referring to CREE white LEDs. The optical simulation reveals that 2 μm(More)
The inverted dispensing (ID) method is proposed to fabricate remote phosphor layers (RPLs) with cone-like shapes for white light-emitting diodes (WLEDs) to improve their color uniformity. We introduce surface evolver packages and optical simulations to study the effect of the surface tension on the optical performance of these WLEDs during the ID process.(More)
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