A Novel Red-Emitting Phosphor Ca <sub>2</sub> GdNbO <sub>6</sub> : Eu <sup>3+</sup> : Influences of Sintering Temperature and Eu <sup>3+</sup> Concentration on the Photoluminescence
Xintong Zhang, Ruirui Cui, Jun Zhang, Xiaosi Qi, Chaoyong Deng
Abstract
A series of novel double perovskite Ca 2 GdNbO 6 : Eu 3+ red-emitting phosphors have been synthesized by the conventional solid-state reaction route at various Eu 3+ ion concentrations and sintering temperature. The crystal structure of phosphors was determined by an X-ray powder diffraction pattern, and the micromorphology was described by scanning electron microscope. The optical properties were analyzed through absorption spectra, photoluminescence spectra, decay curve, CIE chromaticity coordinate, and thermal stability. The synthesized Ca 2 GdNbO 6 : Eu 3+ phosphors emit red light (614 nm) under 416 nm excitation. The emission intensity of the sample reaches the maximum when the Eu 3+ ion concentration is of 0.5. The CIE chromaticity coordinate of Ca 2 GdNbO 6 : 0.5Eu 3+ phosphor is (0.652, 0.347), located in the red region. The investigation results indicated that the Ca 2 GdNbO 6 : Eu 3+ phosphors have potential application in white light-emitting diodes.