Preparation And Properties Of Rare Earth-doped Al₂O₃ Luminescence Materials

Al2O3 is an important light-emitting substrate material with excellent physical and chemical properties. At present, there are a lot of phosphor preparation methods, such as precipitation, thermal decomposition, sol-gel method, combustion, laser evaporation condensation method, CVD method, hydrothermal method, the template assembly and so on. Compared to emulsion method has many advantages, such as the process is simple, the product of the synthesis of high purity, good uniformity of chemical composition, synthesis temperature is low, the product of more uniform particles, small, etc. Currently, the rare earth ions doped Al2O3-based light-emitting materials, preparation methods and optical properties of the study, but have not received some useful results.Using Al2O3 as matrix, rare earth (Eu3+,Pr3+) single doped luminescence material were prepared by. The modern analysis techniques such as XRD, FTIR, SEM and FP spectra were used to measure the property of the luminescence material.1. The europium ion doping and calcinations temperature on the luminescence properties of Eu3+ were investigated. Light-emitting red light have a very strong physically, there are six bands were attributed to Eu3+,5D0→7F0(579nm),5D0→7F1(592nm),5D0→7F2(617nm),5D0→7F3(653nm) and 5D0→7F4(700nm) of the electronic transition to 5D0→7F2(617nm) emission of the strongest electronic transition, can be used as a red light-emitting materials. Eu3+ to be the best doping concentration for 1mol%, over 1200℃calcined 2h, can be a very high luminous intensity of Al2O3:Eu3+ phosphor.2. The Pr ion doping and calcination temperature on the luminescence properties of Pr3+ were studied. Luminous body also produced a strong red luminescence excitation spectrum is divided into two parts:from the peak at around 400nm and 451nm, and 471nm are located near the composition of several emission peaks. The former belongs to Pr3+ -O2-charge transfer transitions between the shows matrix and energy transfer between Pr3+. The latter derived from the Pr3+ electronic transition of the 4f inner shell. Their strongest excitation peaks at 451nm department, corresponds to the Pr3+ electronic transition of 3H6→3P0.Pr3+ to be the best doping concentration for lmol%, over 1200℃calcined 2h, can be a very high luminous intensity of Al2O3: Pr3+ phosphor.3.The effects of different sintering method at atmospheric pressure sintering, SPS, no pressure sintering luminescence properties of samples were studied. Found to be non-pressure sintered samples derived from emission spectra intensity of the strongest ways are the three kinds of sintering Eu3+ doped amount of 1mol% when the maximum luminous intensity. Obtained by SPS sintering Al2O3:Eu3+ phosphor luminescence intensity weaker than the normal pressure sintering, mainly due to Al2O3:Eu3+ phosphor with carbon infiltration, the best excitation wavelength of 465nm, then the strongest emission peak near the 696nm.Pressureless sintering get Al2O3:Eu3+ phosphor luminescence intensity stronger than the normal pressure sintering, because no pressure is more complete combustion than atmospheric pressure.