Synthesis And Properties Of Oxysalt-based Optical Information Storage Materials

With the explosion of information in present society,information storage is playing a more and more important role.Among them,there are lots of confidential document files need to be preserved safely for a long time.To meet the requirements of high density,large capacity,fast response and long life,combined with the breakthrough optical super-resolution technology in recent years,it is expected to achieve high-density storage of optical discs.At present,it is necessary to find new inorganic optical storage materials with optical quantum effects and good stability.Considering the above-mentioned,the significance of the present research is to design two contrast types of electron trapping inorgainc optical information storage materials and carry out specific implementation.For the key issues of rewritable and stability issues in optical information storage,the routes of co-doping,lattice site element substitution,and atmosphere treatment have been used to induce defects formation,which may effectively modulate the trap concentration and depth,targeting some candidate materials for optical storage technology and its applications.The first part of this paper is mainly around strontium stannate?Sr₂SnO₄?material.By Eu³⁺single doping or Eu³⁺/Nd³⁺co-doping,and element substitution at matrix lattice B site,the varied strontium stannate-based compounds were synthesized via solid state method,and their phase structures,luminescence properties,thermoluminescence properties,optical information storage properites,and optical information write-in/read-out demonstration were systematically studied.The peak position of photoluminescence spectra was consistent with that of photo-stimulated luminescence spectra,indicating that Eu³⁺/Nd³⁺co-doping sample possessed optical information write-in and read-out characteristics,while Eu³⁺single doping sample did not possess optical information read-out characteristic.After Nd³⁺co-doped,the peak position of thermoluminescence spectra of co-doping sample shifted to higher temperature,and the peak was separated to two peaks,which means that the depen trap level can stably store optical information.Based on Eu³⁺and Nd³⁺ions co-doping,Snions was partially replaced by Zr ions,causing the thermoluminesce intensity enhanced and the relative peaks shifted to higher temperature,which proved that deep traps were generated and were useful to optical information storage.Through the co-doping and substitution cooperation mechanism,materials with good optical information storage performance can be obtained.The second part of this paper is mainly around yttrium aluminum gallate garnet(Y₃Al₄Ga O₁₂)material.The experimental routes for yttrium aluminum gallate garnet matrix were designed not only with Ce³⁺single doping,Ce³⁺/V³⁺co-doping,and elements substitution at matrix lattice A-site,but also utilizing atmospheres annealing treatment to induce defects formation.A series of yttrium aluminum gallate garnet compounds were prepared to systematically study their phase structures,luminescence properties,thermoluminescence properties,and optical information storage properites.The research results show that on the basis of Ce³⁺/V³⁺co-doping,after Y ions at matrix lattice A-site were substituted by Lu and Gd ions,causing the crystal field changed and a blue shift occurred in the emission peak of the compound and the thermoluminescence intensity of the compound increased obviously.What's more,its peak position of photo-stimulated luminescence spectrum was consistent with photoluminescence spectrum,suggesting that it possessed optical information write-in and read-out characteristics.After annealed in a weak reducing atmosphere,though the phase structure,morphology,and the emission peak position of the compound with Y ions substituted by Lu and Gd ions didn't have obvious change,its thermoluminescence intensity sharply increased and relative peaks moved to higher temperature,which the integral area is 7.46 times that of the unannealed compound.And,the consistence of peak position of photo-stimulated luminescence spectrum and that of photoluminescence spectrum indicated that the compound annealed in a weak reducing atmosphere is a good candidate for optical information storage materials.In addition,this compound also had an excellent fluorescence thermal stability,which was confirmed by the fluorescence intensity tested at 573 K reserved a value of 91.6%of the the fluorescence intensity tested at room temperature.