The growth and luminescence properties of Y3Al5O12:Ce3+ single crystal by doping Gd3+ for W-LEDs

• The highly transparent Ce and Gd co-doped YAG single crystal was grown by Czochralski method.
• The luminescence properties of Ce and Gd co-doped YAG single crystal are investigated in detail.
• Such Ce,Gd:YAG single crystal-based W-LED exhibits excellent optical performance.
• A very low light loss of Ce,Gd:YAG single crystal under a high temperature (in the temperature 378 K and 438 K).

Transparent Ce3+ and Gd3+ co-doped Y3Al5O12 (Ce,Gd:YAG) single crystal (SC) was successfully grown by the Czochralski method. Meanwhile, the structures and optical properties of single crystal wafers (SCWs) were investigated. When Y3+ ions were partially substituted by Gd3+ ions, the emission peak shifted towards the long wavelength direction. Compared with commercial phosphors, SCWs not only showed excellent thermal stability, but also exhibited superior optical performance with a luminous efficacy of 144.11 lm/W, a correlated color temperature of 5639 K and a color rendering index of 69.9.