LAUSR

Abstract The NaEuF4 nanorods were prepared by an ultra-rapid reaction route at room temperature. Under the excitation of near-ultraviolet (NUV) light, the synthesized nanorods emitted visible red emission, which is ascribed to the characteristic emission of Eu3+ ions, with high color purity of 90.2%. To get deeper insight into the local structure circumstance of Eu3+ ions, a theoretical calculation based on the Judd-Ofelt theory was performed to evaluate the intensity parameters and the larger Ω2 suggested that the Eu3+ ions occupied the low symmetry sites in the NaEuF4 host lattices. The temperature-dependent photoluminescence emission spectra were recorded to examine the thermal stability of the resultant samples and the activation energy was determined to be 0.208 eV. To test the potential practicability of the studied samples in solid-state lighting, a light-emitting diode (LED) device was fabricated. Under a forward bias current of 100 mA, the fabricated LED device emitted dazzling white light with high color rendering index of 90.3, suitable correlated color temperature of 6793 K and good color coordinate of (0.313,0.297). In addition, the cathodoluminescence properties of the NaEuF4 nanorods were systematically studied to explore their applications in field emission displays.