Preparation, Structure And Spectral Properties Of Tb Fluoride And Semiconductor Luminescent Materials

In general, the various factors of micro-/nanostructures, such as composition structure, crystal phase, morphology, dimensionality and so on, will have a great impact on its physical and chemical properties. Therefore, reasonable and effective control of these factors can help us to get inorganic functional materials that have the desired physical and chemical properties, which is the hot spot in the field of materials science. At the same time, it has great help for better understanding of crystal growth process and final realization of various functional materials in accordance with the design of the people. In a large number of materials synthesis methods, hydro / solvothermal method is a simple and common method of preparation. In this paper, hydrothermal method is used as the main synthesis method to exploratory study the rare earth and semiconductor light emitting material with different properties(phase and morphology control, growth mechanism and luminescence properties). The main contents of this paper are as follows:(1) The three different synthesis methods(hydrothermal method, room temperature precipitation method and the traditional solid state method) were used to synthesize NaTbF4 with different properties. The samples were characterized by XRD, SEM and luminescence properties to compare their differences, respectively. On the premise of the comprehensive comparison, it is concluded that the hydrothermal method is an ideal synthesis method for NaTb F4.(2) A series of terbium fluoride with different phase, morphology and size were synthesized under different reaction conditions(different additives, the amount of additives, pH values, reaction time and temperature) by hydrothermal synthesis technology.(3) On the basis of the above work, Eu doped Na TbF4 crystals were synthesized by hydrothermal method under a certain condition. The green emission of NaTbF4 and red emission of Eu doped Na TbF4 with the luminescence principle of energy transfer were analyzed in detail. By changing the doping amount of Eu3+, the luminous color of samples can be changed from green, yellow, orange to red.(4) The In2O3, InOOH and In(OH)3 nanocrystals were controllable synthesized by a one-step hydrothermal route. The reaction temperature is as low as 200 ?C. By tuning the amount of water, the sample composition can change from In2O3 to InOOH to In(OH)3 gradually.