Abstract
Phosphor-in-glass (PiGs) is one of the most important strategies to overcome thermal influence in high-power white light-emitting diodes and laser diodes. By carefully designing the glass composition of Na2O-CaO-B2O3-SiO2, the multi-color PiGs are successfully fabricated by a single-step co-sintering strategy at a relative low temperature (850 °C), most of PiGs maintain a high internal quantum efficiency approaching 90% of original phosphors. Under the 450 nm blue laser diodes (LDs) excitation, the luminous efficacy of YAG:Ce-PiG reaches 239.3 lm/W, which is almost the best result in white laser diodes (WLDs) so far. Outstandingly, the designed glass overcomes the oxidation, corrosion and decomposition of commercial nitride red phosphors, and realizes broadband emission from 500 to 700 nm by compositing red/yellow/green phosphors in an entire glass. Correspondingly, this work paves the way to achieve ideal white light with a high color rendering index of 94 in WLDs.
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