Efficient red phosphor double-perovskite Ca3WO6 with A-site substitution of Eu3+
Abstract
Luminescent properties of Eu3+ activated double perovskite structure Ca3WO6 were investigated. It emits an ideal red color centered at the wavelength of 618 nm with suitable excitation from f–f transitions of Eu3+ ions (360–550 nm) matching the near ultraviolet and blue LEDs. Charge compensation effect of Li+, Na+, and K+ was investigated, and K+ proved to be the best. The co-doping ion K+ has a great effect on the lattice distortion of the host matrix Ca3WO6, which facilitates the red emission of Eu3+. The substitution site for Ca in Ca3WO6 was analyzed in detail by