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采用溶剂热法合成出尺寸小于30 nm的NaYF_4:Yb,Er上转换纳米晶,用柠檬酸(CA)做表面活性剂使得产物具有良好的水溶性.实验探索得出Na OH或者CA的加入量能够调节溶液中能与稀土离子络合的有效配位基团-COO-的浓度,进而影响NaYF_4从立方相到六方相的相变过程、实现产物形貌的控制和上转换发光性能的调变.逐渐提高Na OH的加入量,产物从30 nm的α-NaYF_4:Yb,Er纳米粒子转变为尺寸300 nm的β-NaYF_4:Yb,Er微球.提高CA的加入量同样会促进β-NaYF_4:Yb,Er微球的形成.还研究上述不同合成条件下,不同形貌结构的产物的上转换发光性能.
The NaYF_4: Yb, Er upconverting nanocrystals with size less than 30 nm were synthesized by solvothermal method, and the product was well water-soluble with citric acid (CA) as the surfactant.Experiments explored the addition amount of Na OH or CA Can adjust the concentration of effective coordinating group -COO- in the solution which can be complexed with rare earth ions, thereby affecting the phase transformation process of NaYF_4 from the cubic phase to the hexagonal phase so as to realize the control of the product morphology and the modulation of up-conversion luminescence properties The content of Na OH gradually increased from 30 nm α-NaYF_4: Yb, Er nanoparticles to 300 nm β-NaYF_4: Yb, Er microspheres.Adding CA increased the content of β-NaYF_4 : Yb, Er Microspheres formation The upconversion luminescence properties of the products with different topographic structures under different synthesis conditions were also studied.