Luminescent properties and application of Eu 3+-activated Gd 2(MoO 4) 3 red-emitting phosphor with pseudo-pompon shape for solid-state lighting

Abstract

Eu 3+-activated Gd 2(MoO 4) 3 pseudo-pompon-like red-emitting phosphors were prepared by solid-state method. The structure, morphology, and luminescent properties of these powder samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and fluorescent spectrophotometry, respectively. The as-obtained phosphors were single crystalline phase with orthorhombic unit cell. The particles of the powder samples had the length of 5-12 ?m and width of 3-7 ?m with flake shape and large surface area, which is suitable for manufacture of white LEDs. The phosphor could be efficiently excited by the incident light of 348-425 nm, well matched with the output wavelength of near-UV (In, Ga)N chip, and re-emitted an intense red light peaking at 615 nm. By combing this phosphor with a ∼395 nm-emitting (In, Ga)N chip, a red LED was fabricated, so that the applicability of this novel phosphor to white LEDs was confirmed. It is considered to be an efficient red-emitting conversion phosphor for solid-state lighting based on (In, Ga)N LEDs.