Abstract Thermal stability and heat dissipation of color converter are the key roadblocks for high-power white light-emitting diodes (LEDs) and laser diodes (LDs). In this work, we fabricated an efficient… Click to show full abstract
Abstract Thermal stability and heat dissipation of color converter are the key roadblocks for high-power white light-emitting diodes (LEDs) and laser diodes (LDs). In this work, we fabricated an efficient and heat-conducting color converter based on phosphor-sapphire composite (PSC) for white LEDs/LDs, in which Y3Al5O12:Ce3+ or Y3Al5O12:Ce3+/CaAlSiN3:Eu2+ phosphor glass film was sintered on a sapphire substrate by using low-melting borosilicate glass. The Y3Al5O12:Ce3+ PSC-based white LEDs achieve a high luminous efficacy of 155 lm/W, and the Y3Al5O12:Ce3+/CaAlSiN3:Eu2+ PSC-based white LEDs exhibit a warm white light with a correlated color temperature of 3509 K and a color rendering index of 88.3. The chromaticity of PSC-based white LDs shifts from cool to warm white. Furthermore, the PSC achieves a high thermal conductivity of 20.8 W m−1 K−1, which provides the effective heat transfer channels. The working temperature of PSC is reduced by 46 °C compared with that of phosphor-in‑silicone.
               
Click one of the above tabs to view related content.