ACU Optimization of pcLEDs by Combining the Pulsed Spray and Feedback Method

In this paper, the pulse-sprayed (PS) phosphor coating technique and feedback method were combined to optimize the angular color uniformity of remote phosphor-converted light-emitting diodes (pcLEDs). The geometry of the phosphor-converted element (PCE) was controlled by the PS technique and the curvature of the phosphor bearing surface. Meanwhile, the yellow and blue light irradiance distributions are as the feedback function to optimize the mass distribution of the PS PCE during the feedback iteration process. With the method proposed herein, the correlative color temperature of the optimized remote pcLED ranges from 5192 to 5263 K with a maximum deviation of only 71 K.