Abstract
The Eu3+ ion activated pyrochlore-type La2Zr2O7 red emitting phosphor was prepared through solid-state reaction. The electronic structure of La2Zr2O7 was investigated with density functional theory (DFT) calculation. The phase purity, crystalline structure, morphology and lattice parameters of the Eu3+ ion doped La2Zr2O7 through powder X-ray diffraction and Rietveld refinement were also elucidated in details. The as-prepared La2Zr2O7: Eu3+ phosphors presented excellent red light emission with intense absorption bands in the near-ultraviolet and blue light regions. The optimized doping concentration of Eu3+ ions was found to be 0.05 with an ideal CIE coordinate index of (0.62, 0.38). Finally, the excellent thermal stability of La2Zr2O7: Eu3+ phosphor was also determined according to the temperature dependent emission spectra, excited at 393 nm. All these results indicated that the La2Zr2O7: Eu3+ phosphors had high potential for applications in solid-state white light-emitting diodes as suitable red-emitting components for white light emitting diodes (w-LEDs), combined with near-ultraviolet or blue lighting chips.
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