The Preparation And Properties Of Nd³⁺ Doped Nano-composites Luminescent Materials With High Concentration

When the first ruby laser was invented, the laser technology developed rapidly. The researchabout high power and high repetition rate lasers Draw people’s more and more attention. But it wasrestricted by the progress of the laser materials. The laser materials used widely currently, such aslaser crystal, laser glass and transparent ceramics, have some shortcomings which is unable toovercome. They are difficult to meet the demands of high power and high repetition rate lasers.Compared with traditional materials, the nano-composites laser materials not only have theadvantage in traditional materials for example high luminescent efficiency and good beam quality,but also it solved the thermal management problem that common materials is hard to cool under thehigh power condition. In this paper, we prepared new nano-composites luminescent materials withhigh concentration, strong fluorescence and long lifetime in according with the current status of theresearch in this field. The optical property of the new material was also be tested.The main contents and research results are as followed:1. The Nd:Re2Zr2O7nanoparticles with well Morphology was prepared by Sol-gel and heattreating process. The chemical and optical property of this sample was characterized by Big-sizeinstruments. The results shows that the uniform size of Nd:Re2Zr2O7nanoparticles prepared bythis process is about60-80nm. But this nanoparticle have concentration quenching. Thefluorescence intensity of Nd3+in890nm,1053nm,1320nm is waning with the Nd3+concentration gradually increased. The lifetime of4F3/2â†'4I11/2transition(1053nm) reduced.There are remained-OH at surface of nanoparticles. So the samples have absorbed peaks whichis caused by Nd3+. But there are still agglomeration in different degrees. This adverse todisperse the nanoparticles in organic solvent.2. The K5NdLi2F10nanocrystals was prepared in solid phase and liquid phase respectively. Thechemical and optical property of this sample was characterized by Big-size instruments. Theresults shows that the size of K5NdLi2F10nanocrystals with agglomeration in different degreesprepared by solid phase method is about90-130nm. The K5NdLi2F10nanocrystals prepared byliquid phase method have uniform size which is about30-40nm. The Nd3+concentration of theK5NdLi2F10nanocrystals is about3.61×1021ions/cm3. This sample with little concentrationquenching have strong emissions at865nm,1048nm and1332nm. The lifetime of4F3/2â†'4I11/2transition (1048nm) could reach303.4μs. This proved that K5NdLi2F10 nanocrystals was a kind of nano-laser materials with high concentration, strong emission andlong lifetime. This liquid phase method was a new route which is designed for synthetic ofK5NdLi2F10nanocrystals. And it aslo was a new thinking for preparing multiple fluoride. ThisK5NdLi2F10nanocrystals prepared by liquid phase method was a potential candidate for theirwell morphology and dispersity.3. We dispersed K5NdLi2F10nanocrystals prepared by liquid phase method in PEG-400to formK5NdLi2F10/PEG-400nano-composites laser materials. It has a lot of advantages such as highconcentration, strong emission, long lifetime and large emission cross section. It also have wellheat radiation under high power condition for its flowability and is a potential nano-dispersionlaser materials. This material has strong emissions at865nm,1048nm and1332nm. Thelifetime of4F3/2â†'4I11/2transition(1048nm) could reach174.6μs. When the concentration is upto1×1020ions/cm3, the transmission at800nm and1048nm were28%and85%respectively.The refractive index of composites materials at1048nm is1.4579which is calculate by fitting.The emission cross section and fluorescence quantum efficiency were4.403×10-20cm2and39.57%respectively by Judd-Ofelt calculation.