Nanometer Of Casio <sub> 3 </ Sub> Light-emitting Properties Of The Materials And Special Morphology Study

Based on the practical value of CaSiO₃: Pb, Mn, and at present the sample is almost made by the high temperature solid-state reaction, but the particle size is big and the luminescence is not strong. In this paper, other preparation method has been studied, and CaSiO₃:Eu³⁺ luminescence nanomaterials with special surface morphology have also been prepared from the reverse micelle micelles. The influence of different methods and conditions on the luminescence and surface morphology have been characterized by Luminescence spectrum, XRD,TEM,SEM,FTIR and DTA-TG.The first part studied that the luminous materials of CaSiO₃: Pb, Mn were synthesized by Sol-gel method and ultrasound technology. Effects of factors such as the synthetic material compositions, ultrasound time and annealed temperature on phosphorescent brightness of sample were studied and the optimum synthetic conditions were determined. The results show that, compared with the sample made by the high temperature solid-state reaction, the luminescent intensity of the CaSiO₃: Pb, Mn sample increased by about 200% and the mean diameter of particles of the sample decreased by about 300nm.The second part was that the luminous materials of CaSiO₃: Pb, Mn were synthesized by Sol-gel method. The results indicated that the luminescent intensity of all the samples were enhanced when three kinds of nonionic surfactants ON70,TO8 and XL80 were added respectively in sol process and the addition of XL80 showed the best enhancement in luminescent intensity. When the V(XL80):V(sol)was 0.5:50, the luminescent intensity of the CaSiO₃: Pb, Mn sample was three times of that of the sample made by the high temperature solid-state reaction, and the dispersivity of the particles was also rather better. The figure of selective area electron diffraction (SAED) showed single crystal lattice, the mean diameter of nanocrystals was about 150nm. When the V(XL80):V(sol)was 1: 50, the particles of phosphors were synthesized as nanorods with different length and width, and the figure of SAED showed more orderly single crystal lattice.The third part was that a series of luminescent materials, CaSiO₃: Pb, Mn, Li, were synthesized by Sol-Gel method. It is found that the little addition of Li+ ions results in decreasing synthesizing temperature, increasing emission intensity of Mn²⁺ ions and blue shift of its emission band. When the doping amount of Li+ ion in CaSiO₃: Pb, Mn is 0.65%, the synthesizing temperature of CaSiO₃:Pb,Mn decreased to 900°C, its emission intensity increased about three times, and its emission shift from 650nm to around 615nm.At last, we researched CaSiO₃:Eu³⁺ nanospheres prepared from the reverse micelle micelles consist of Lutensol XL80, cyclohexane and water. The results show that, the uniform nanospheres were prepared while the w0 value is 5 and the concentration of XL80/cyclohexane is 0.2mol/L. The influence of the sintering temperatures on the shape and crystallization of CaSiO₃:1%Eu³⁺ phosphor was investigated. The results showed that the temperature of crystallization (at 668℃) and phase transition (at 790℃) of CaSiO₃:1%Eu³⁺ nanospheres decreased compared with bulk materials. The average size of CaSiO₃:1%Eu³⁺ agglutinated nanospheres drying at 70℃was below 100nm, and the uniform nanospheres with the average size of 350nm was prepared while annealed at 700℃. Further annealed at 800℃, the nanospheres almost breaked and melted down. The effect of CaSiO₃ doped with different concentration of Eu³⁺ on the shape and photoluminescence was also studied. The uniform nanospheres morphology was destroyed with the increasing concentration of Eu³⁺, and the particle size was increased. As doping 6% Eu³⁺, the particles presented anomalistic morphology. The main emission band excited at 395nm was the hypersensitive 5D0â†'7F2 red emission at 613nm. It showed that Eu³⁺ ions are located in more non-reversion center lattices. As doping 5% Eu³⁺, the emission intensity still have not been reduced, which indicated that the prepared nanospheres had much higher quenching concentration than that of bulk materials which were made by the high temperature solid-state reaction.