The Preparation And Optical Properties Of Phosphors Based On Exchanging Rare-ions-zeolite 13X

In this paper, multi-color center phosphors of Eu³⁺/Eu²⁺, red phosphor of Eu³⁺/Y³⁺, white phosphor of Eu³⁺/Ce³⁺ and green phosphors of Tb³⁺/Ce³⁺ have been synthesized via ions-exchanged. The structures and optical properties of as-prepared products were thoroughly characterized using FT-IR spectrum, X-ray diffraction (XRD), thermogravimetry-differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), and photoluminescence (PL), respectively. The results are summarized as follows.Eu³⁺-X phosphors were fabricated via ion-exchanged, and their structure and photoluminescence properties were thoroughly investigated. It can be found that it was the best exchange when the Eu³⁺ concentration is 5% of the Na+ in the zeolite. A broad blue emission band (430-500 nm) and a sharp red emission band (600-630 nm) under 397 nm UV light excitation, which are attributed to the characteristic peaks of the Eu²⁺ and Eu³⁺ ions, respectively. The blue emission intensity weakens while the red emission intensity enhances as increasing sintering temperature. And the distribution of the nanoparticles is uniform in the zeolite cavities under low temperature but the structure of zeolite has been transformed to amorphous structure above 800 oC. Moreover, this material under the long-wavelength UV light excitation may have potential for the application in UV-LEDs.Eu³⁺-Y³⁺-X phosphors were fabricated via Eu³⁺ and Y³⁺ ions-exchanged zeolite. The best concentration of Y³⁺ ions can be ascertained. Then the products were sintered under different temperature. The intensity of Eu³⁺-Y³⁺-X phosphors is two times as the intensity of Eu³⁺-X under the same voltage and wavelength, and the distribution of the nanoparticles is more obvious under low temperature. It has the potential for LEDS and lighting because of its outstanding properties.In this paper, we also have obtained the Ce³⁺-X, Tb³⁺-X, Eu³⁺/Ce³⁺-X and Tb³⁺/Ce³⁺ phosphors via ion-exchanged. The products were sintered under protecting of active carbon. Then we can find that certain concentration of Ce³⁺ ions can increase the optical properties of Eu³⁺ and Tb³⁺ ions and remedy the deficiency of other materials'optical properties. It provides the quotable experience for the new LEDs materials.