Study For Photothermal Properties Of Lanthanide-doped Low-dimensional Phosphors Prepared Via Wet Chemical Routes

Transport has functioned as connection among national economic systems,thus it's significant to optimize the self-supportability of vehicles.Rare earth doped solid state lighting materials employed in automobiles,ships and aircrafts can sufficiently reduce the consumption of energy.Temperature sensing and photothermal properties of rare earth elements have potential applications in measurement and maintenance of micro-electronic devices in vehicles.Meanwhile,with the development of nano-technology,low-dimensional nano-materials have been intensively studied for controllable synthesis because of their unique optical,electronic,magnetic,acoustic and catalytic properties.In this thesis,we synthesize different lanthanide ions doped micro-/nano-materials through solution-based chemical routes and study their temperature sensing and photothermal properties.The main contents are included as follows:?1?CaSnO₃,NaYF₄,YPO₄,NaLa?WO4?2 and NaLa?MoO4?2 inorganic micro-/nano-structured materials are successfully prepared by microwave-assisted hydrothermal method,which correspondingly certifies the generalizability of this synthetic route in inorganic materials preparation.Crystal phase and morphology of these samples are characterized.It is proved that most of the samples are well crystallized,and their morphologies are affected by reaction factors,like pH value and ligands.?2?NaY?WO₄?₂ micro-flower spheres are synthesized via microwave-assisted hydrothernal route.Pure phase is proved by XRD patterns of products.Morphology of products is influenced by amount of Na3Cit,based of which possible growth mechanism is deduced.?3?Controllable microwave-assisted hydrothermal synthesis of multiple NaY?MoO₄?₂ micro-/nano-structures are realized by reaction factors adjustment,including pH value,ligand and reactant concentration.Possible growth mechanism of these NaY?MoO₄?₂ micro-/nano-structures is described.?4?Temperature sensing properties of Er³⁺-doped NaY?WO₄?₂ is studied.It is concluded sample morphology,Er³⁺ and Yb³⁺ concentration have limited influence on temperature sensing properties of Er³⁺.Photothermal effect of Tm³⁺-doped NaY?WO₄?₂ is also analysed by Er³⁺-doped NaY?WO₄?₂ as luminescent temperature probe.It is suggested that,compared with Er³⁺,Tm³⁺ is more effective photothermal medium.?5?Photothermal property of Sm3-doped NaY?MoO₄?₂ nano-rods is monitored by Er³⁺-doped NaY?MoO₄?₂ nano-rods functioning as temperature probe.Results reveal the fact that both concentration of SmII and Yb3D will influence the photothermal effect of Sm³⁺-doped NaY?MoO₄?₂ nano-rods,whearas influence of Yb³⁺ is more obvious.?6?NaYF₄:Er³⁺AYb³⁺@NaYF₄:Sm³⁺/Yb³⁺ core-shell nano-structures are prepared by thermal decomposition method.NaYF₄:Er³⁺/Yb³⁺ nano-particles and NaYF₄:Er³⁺/Yb³⁺@NaYF₄:Sm³⁺/Yb³⁺ core-shell nano-structures are both pure phased and core-shell structure is relatively well crystallized.Yb³⁺ concentration in shell can affect the morphology,particle size and photothermal effect of NaYF₄:Er³⁺/Yb³⁺@NaYF₄:Sm³⁺/Yb³⁺ core-shell nano-structures.