Synthesis And Properties Of Aluminate Phosphor By Hydrothermal Method

It is an important issue to find a way to save energy under the background of the shortage of energy resources. The LED lighting technology came into being in such a background because of its well properties of high efficiency, better stability, lower energy consumption and so on. The research and development of high performance phosphor plays a very important role in improving the performance of LED. In this paper, a series of aluminate were prepared by hydrothermal method and the structure, morphology and luminescent properties of samples were characterized by X-ray diffraction analysis?XRD?, Scanning Electron Microscope?SEM? and Fluorescence spectrophotometer. It has important significance for improving the properties of phosphors, optimizing the technology conditions of phosphor prepared by hydrothermal method and development of new type aluminate phosphors.A series of Sm³⁺ ions doped Sr₃Al₂O₆ phosphors were successfully synthesized via hydrothermal method. Their structure, morphology and luminescent properties of samples were analyzed. The results indicate that simple phase Sr₃Al₂O₆ was obtained, the sample can be excited by 405 nm and emitted red light. The emission intensity reaches the maximum when the molar fraction of Sm³⁺ is 0.01. The concentration quenching mechanism is the energy transition between the nearest neighbor ions. The influences of temperature on the luminescent properties were studied. Finally, decay curves of the sample were characterized.We have synthesized series of Sr_3-xAl₂O₆:xEu³⁺ samples by hydrothermal method. The effects of different solvents on the morphology of sample were investigated. The luminescence properties of sample with the different concentrations of Eu³⁺ were observed and analyzed. The result showed that the intensity of the emission peak reached the maximum when Eu³⁺ doped 2 mol%, and the strongest emission peak located at 594 nm. The strongest excitation peak in the excitation spectrum was located at the 394 nm through monitoring deferent emission peaks. And the decay curves of the sample were characterized. In addition, the influence of ammonia of Sr_3-xAl₂O₆:xEu³⁺ were studied in detail.Eu³⁺ doped the series of Ca₃Al₂O₆ phosphors were synthesized by hydrothermal method. The effects of different solvents on the morphology and luminescence properties of sample were analyzed. There are two excitation bands in the region of 200-500 nm including the O2--Eu³⁺ charge transition band?CTB? and the f-f transition absorption of Eu³⁺. Meanwhile, the absorption spectra of the samples were studied. Under the excitation of 392 nm, the emission spectrum consists of two strong emission peaks at 594 nm and 618 nm, respectively. And the main peak is at 618 nm?5D0?7F2? and the secondary peak is at 594 nm?5D0?7F1?. Some more research has been done on decay curves of the sample. And the maximum intensity of emission peak is obtained when the molar fraction of Eu³⁺ is 0.02. It is found that the concentration quenching mechanism is dipole-dipole interaction mechanism. Besides, we measured and analyzed the luminescence change of the samples at different temperatures in detailed.