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In this paper, we prepared a multi-color phosphor-in-glass (PiG) for the packaging of warm white light-emitting diodes (WLEDs). The multi-color PiG yields a red, green, and blue (RGB) phosphors glass layer, which was screen-printed and co-sintered on a glass plate at the temperature of 600°C. The RGB-PiGs were directly bonded on flip-chip ultraviolet (UV) LEDs. By controlling the thickness of RGB...
In this paper, a new subpixel mapping approach for hyperspectral image is proposed, using a spatial-spectral endmember dictionary with collaborative representation (CR). Different from the classic approaches, the proposed approach employ several spatially closest training samples as the endmembers used for the representation of each mixed pixel, instead of the entire training set. Furthermore, the...
High angular color uniformity (ACU) is strongly required in many illumination applications. In this letter, we propose a low-cost and facile phosphor coating method based on electrohydrodynamics to realize high ACU for phosphor-converted white light-emitting diodes (LEDs). By applying an electric field around a liquid phosphor–silicone encapsulant, a normal force is induced on the air–liquid interface,...
A patterned packaging structure was proposed to enhance the luminous efficacy of multiple phosphor-in-glass (PiG) based white light-emitting diodes (WLEDs). In this work, a red and yellow patterned PiG was prepared by using screen-printing and low temperature sintering. The comparison experiments between the conventional mixed PiG structure and patterned PiG structure were conducted. Compared with...
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