稀土鋯酸鹽體系熒光粉的制備及發(fā)光性能研究
[Abstract]:The special 4f electrons of rare earth ions emit a great deal of radiation and fluorescence information in the f-f configuration and between the F-D configuration. They can emit electromagnetic radiation of various wavelengths from ultraviolet, visible to infrared regions. Their luminescence characteristics are high brightness, bright color, high color purity, strong light absorption ability and emission. In recent years, rare earth inorganic luminescent materials have become the backbone materials for illumination, display, optical communication, medical imaging and many other display fields, and the development and preparation of high-performance phosphors have become an important issue in the field of luminescent materials in the new era. Gd_2Zr_2O_7, Y_2Zr_2O_7 phosphors were synthesized by hydrothermal method with zirconate as the base material. Red and green light emission was achieved by doping active ions (Eu~ (3+), Tb~ (3+). The effects of different surfactants on improving the luminescent properties of phosphors were discussed. The main conclusions were as follows: 1. Gd_2Zr_2O_7 phosphors were prepared by hydrothermal method. X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), fluorescence spectroscopy (PL) and other characterization methods were used to analyze the phase composition, microstructure and luminescent properties of Eu~ (3+) red phosphors. XRD spectra showed that the diffraction peaks of samples with different Eu~ (3+) doping concentrations (Gd1-xEux) _2Zr_2O_7 were basically the same. The microstructure of the sample was confirmed to be ordered pyrochlore structure. The FE-SEM observation showed that the microstructure of the sample was nanorods with a length of about 2000-3000 nm and a diameter of about 300 nm. PL analysis showed that when Eu~ (3+) doping concentration reached 4%, the sample was 613 nm (5D0-7F). 2) The luminescent intensity reaches the maximum value, but the doping intensity decreases and the concentration quenching occurs. The luminescent mechanism and the factors affecting the luminescent properties are explained and a scheme for further optimizing the luminescent properties is proposed. 2. Gd_2Zr_2O_7:Tb~ (3+) green phosphor is prepared by hydrothermal method and characterized by XRD, FE-SEM, TEM and PL. The results show that the diameter of Gd_2Zr_2O_7:Tb~ (3+) nanorods is about 30 nm and the length is in the range of 150-300 nm. The PL test results show that Tb~ (3+) exhibits a strong green emission property, belonging to the 5D4 7FJ (J = 3-6) of Tb~ (3+) and the strongest emission peak appears at 545 nm. At 5D4 7F5, the concentration quenching of Tb ~ (3 +) doping occurs when the concentration of Tb ~ (3 +) is 5%. The effect of cross-relaxation between Tb ~ (3 +) on the luminous intensity and optical purity is discussed. In this section, the contrast sample (Gd0.95Tb0.05) _2Zr_2O_7 prepared by high temperature solid-phase method is an irregular polygon with uneven size and slightly higher luminous intensity. 3. Y_2Zr_2O_7:Tb~ (3+) green phosphor was prepared by hydrothermal method using Y_2Zr_2O_7 as the substrate material. The fluorescence spectrum analysis showed that the strongest emission peak of the (Y1-x Tb x) 2ZrO_7 phosphor belonged to the strong green emission of the 5D4 7F5 electron transition (545 nm) of Tb~ (3+) when the concentration quenching occurred. The distance between Tb~ (3+) was calculated by formula. FE-SEM confirmed that the product was a hollow nanotube with an inner diameter of 80-130 nm, a wall thickness of 30-70 nm and a length of 3-5 micron. This kind of phosphor with high regularity of morphology and good dispersion has a good application prospect. On the premise of optimum doping ratio of Tb~ (3 +) in Y_2Zr_2O_7:Tb~ (3 +) phosphor, four surfactants, sodium dodecyl benzene sulfonate (SDBS), sodium dodecyl sulfate (SDS), non-ionic surfactant polyvinylpyrrolidone (PVP), organic salt disodium ethylenediaminetetraacetate (EDTA), were added to improve the luminescence intensity of phosphor. The results show that the surface active agent can obviously improve the light absorption ability, quantum efficiency and luminous intensity of phosphors. The luminous intensity of the phosphors doped with EDTA is 7 times higher than that of the samples without surfactant, and the micro-nano-scale of the phosphors is also obtained. The rice bar is uniform in size, smooth in surface and regular in shape. It has the potential of high performance phosphor.
【學(xué)位授予單位】:浙江理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TQ422
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