Synthesis, Crystal Structures, and Photoluminescence Properties of Ce3+-Doped Ca2LaZr2Ga3O12: New Garnet Green-Emitting Phosphors for White LEDs

摘要

A new family of garnet compounds, Ca(2)LnZr(2)Ga(3)O(12) (Ln = La, Y, Lu, Gd) have been synthesized fiy-high-temperatiire solid-state reaction method: The crystal structures were characterized by the X-ray diffraction (XRD) and refined by the Rietveld method. The photoluminescence properties, morphology, CIE Value; Vranturn efficiency; and thermal stability of Ca2LaZr2Ga3O12:Ce3+ phosphors were investigated in detail to evaluate the use in w-LEDs. The photoluminescence results revealed that theSe phosphors have a broad excitation band in the blue region ranging, from 400 to 470 to and a broad green emission band centered at about 515 nm. The above results indicated that tfielyhosphors could be effectively excited by blue light and may have the,potential to serve as green-emitting phosphors for application in w-LEDs.