The Synthesis And Luminescent Properties Investigation Of Rare-earth Ions Doped Yttria Phosphate Luminescent NanoMaterials

Y2O3:Eu3+ is a conductor, while maintaining the stability of bulk materials and luminescence characteristics of bulk materials,which can solve the FED and PDP applications,this can improve the Tu-screen technology, thus the red phosphor has the potential applications of the FED and PDP's luminous material.In this article, we have adopted a series of hydrothermal synthesis of rare-earth ions co-doped as well as single-blending, and alkaline earth metal ions co-doped Y2O3 matrix in the samples of the light-emitting materials,and systematic and comprehensive study of the structure of the synthesized samples and optical performance in order to choose high quality, high-performance light-emitting material.We obtained experimental results were summarized as follows.In the first chapter, we systematically discusses the introduction of nano materials,nano-rare earth luminescent material definition,classification and the special nature of the composition. At the same time, in this chapter we are also discuss with Y2O3 as a substrate luminescence of rare earth doped nano-materials research background, research status application,background. We use hydrothermal synthesis to prepare a series of yttrium oxide as a substrate doped with different rare earth ions nano-light-emitting materials.Their structure and luminescence properties has been studied. We researched through a series of experimental conditions,hot water temperature, pH, calcination temperature and so on. Finally, we have synthesized rare-earth-doped yttrium optimum reaction temperature is 160℃,the best reaction time is 6h, reaction solution the lowest pH value is 12.In the Y2O3:Eu system, we get such result from their fluorescence excitation and emission spectra,which, for different concentrations of Eu-doped Y2O3:Eu system, through the luminous intensity to be compared, Eu optimal doping ion is 5%, when over the concentration, due to concentration quenching effect of making it luminous intensity of dampening. In the Y2O3:Tb system and Y2O3:Dy system, on their respective rare-earth Tb, Dy ions,the luminescence properties of Y2O3 were discussed. At the same time, we have different concentrations of Tb, Dy ion doping on the luminescence properties of Y2O3 and luminous intensity are compared.End up,for Y2O3:Tb system, Tb ion optimum doping content is 4%, while for Y2O3:Dy system, Dy ion optimum doping content is 1%.We synthesized Eu, Tb double ions,Eu, Dy double ions,Tb,Dy double ions co-doped in Y2O3 samples by hydrothermal method.We studied the morphology, luminescence properties and emitting color of the samples by TEM, fluorescence excitation and emission spectra, CIE. In the sample of Eu,Tb double ions co-doped in Y2O3,we can get that the luminous intensity of the Eu,Tb double ions in Y2O3 changed with the modification of ions'proportion under the excitation of 307nm UV. Especially when Eu, Tb ion ratio is 1:5,Eu, Tb ion green and red luminous intensity ratio is 1.15,the color of the complex light is similar to yellow white.Meanwhile,through the excitation spectrum, we can get that Tb3+may transfer energy to Eu3+in the co-doped samples.In the sample of Eu,Dy double ions co-doped in Y2O3,we can get that the luminous intensity and color of the Eu,Dy changed with the modification of ions'proportion under the excitation of 350nm UV.Because the luminous color of Dy is light, when Eu, Dy ratio is 3:1 and 2:1,the color of the complex light is red. In the sample of Tb,Dy double ions co-doped in Y2O3,we can get that the luminous intensity and color of the Eu,Dy changed with the modification of ions'proportion under the excitation of 350nm UV.Especially when Tb,Dy ion ratio is 1:1,Tb ions and Dy ions' characteristic peaks of emission intensity is same, so we can get satisfactory complex white color and the color coordinates of CIE (0.3072,0.353)with the standard white light (0.33,0.33)is very close.It can achieve to the practical application with the improvement of luminous intensity.We synthesized Eu, Mg and Eu, Ca co-doped in Y2O3 samples by hydrothermal method.We studied the morphology, luminescence properties and emitting color of the samples by TEM,SEM, fluorescence excitation and emission spectra. In this experiment, the prepared samples of Eu, Mg, and Eu, Ca co-doped in the Y2O3 co-doped are in uniform nano-rod structure,the size of these nano-rods are nanoscale and the length is about 1000 nm, the diameter is 30-50 nm. The luminous intensity of co-doped samples increases with the increasing of Mg2+ Ca2+ ion concentration.Until the co-doped ion concentration is in 3% Mg2+,5%Ca2+,it reaches its maximum. At this time,compared with non co-doped samples,the fluorescent light intensity of Y2O3:Eu5%Mg 3%,and Y2O3:Eu5%Ca5%is 1.25 times and 1.1 times. This enhancement provide an experimental basis for improving the luminescence intensity of phosphor. Meanwhile, in this experiment, we explained the reasons for the enhancement of the luminous intensity of the co-doped samples.For this enhancement we give two possible explanations.one is based on experimental results we get, because of divalent rare-earth ions are not equivalent to the non-replacement of the defect levels generated, so that trivalent Eu ions in the charge transitions when there is a strong energy absorption, it caused an increase in luminous intensity. Another explanation is that not equivalent to non-rare earth ions in the crystal lattice of the matrix caused crystal field magnification of the activator ion Eu. These two arguments for understanding the role of co-doped ions are very meaningful.