Highly thermal-stable warm w-LED based on Ce:YAG PiG stacked with a red phosphor layer

We realize a facile chromaticity tuning for the Y3Al5O12:Ce3+ phosphor-in-glass (PiG) based w-LED, with the aid of a CaAlSiN3:Eu2+ red phosphor layer in a remote-type stacking configuration. It was experimentally demonstrated that both the stacking order and the relative amount of red phosphor influence the electroluminescent performance of the constructed w-LED significantly, and the optimized warm w-LED exhibits admirable performance with a luminous efficacy of 93.9 lm/W, a correlated color temperature of 3346 K, a color rendering index of 77.3, and a color shift deviating from Planckian locus in D-uv of 0.0034. Significantly, the red phosphor layer stacked PiG based warm w-LED presents an excellent heat resistance, endowing the device with long life-time, which may serve as a promising robust high-power indoor lighting source. (C) 2015 Elsevier B.V. All rights reserved.