Study On Particle Size Control And Dye Adsorption Of Nano Gd₂O₃:Er³⁺

The size,morphology and microstructure of rare earth luminescent materials have an important impact on their properties and applications,The rare earth nano-luminescent materials with good uniformity,uniform particle size and excellent performance are still hot issues.Articles with cyclohexane as the oil phase,myristic acid as surface active agent,inorganic salt aqueous solution as the water phase,by surfactant in oil/water system self-assembly synthesis of different particle size of Gd₂O₃: Er³⁺ rare earth luminescent material.The effects of the amount of surfactant,the volume of the water phase and the content of the precursor on the size of the particle are discussed respectively.The results show that:（1）The effect of surfactants on the particle size is mainly to change the number of reverse micelles to change the size of the particles.In a certain range,the size of particle size decreases with the increase of surface active agent.When the surfactant is added to 2.49 g,the minimum particle size is 45.00 nm.（2）The effect of water relative particle size is mainly by changing the size of the reverse micelle,and then affecting the growth of the crystal nucleus to change the size of the particle size.When the volume of the water phase is 5.00 ml,the smallest size is 45.73 nm.（3）The influence of precursor content on particle size is mainly influenced by the influence of the number of nucleation and the growth rate of crystal.When the other ratio is certain,when Gd（NO）3.6H2 O is 0.0032 mol,the particle size distribution is uniform and the smallest size is 39.02 nm.（4）The luminescence intensities of different particle sizes were measured.It was found that the luminescence intensity of rare earth nanomaterials decreased with the decrease of particle size.Using Gd₂O₃:Er³⁺ of 40 nm respectively Adsorbed fluorescent yellow 8g（Perylene two formic acid two isobutyl）,BODIPY（Boron two pyrrole）and BODIPY precursors（boron two pyrrole precursor）.the interaction between rare earth luminescent materials Gd₂O₃: Er³⁺ and the dyes in the luminescence process was discussed.The results showed that:（1）Gd₂O₃: Er³⁺ absorbs fluorescent yellow 8g the emission wavelength is 595 nm and the energy transfer occurs between fluorescent yellow 8g and Er³⁺.It makes the 4S3/2 energy level of Er³⁺ split,and fluorescence intensity of Gd₂O₃: Er³⁺ adsorbed fluorescent yellow 8g was increased;（2）Gd₂O₃: Er³⁺ absorbs the bodipy with emission wavelength of 531 nm,energy transfer occurs between bodipy and Er³⁺ under the excitation of 350 nm.Er³⁺ emits an emission line of 4S3/2 → 4I15/2 and emits light Significantly enhanced strength;（3）When Gd₂O₃: Er³⁺ absorbs non-luminescent dye bodipy precursors of absorption wavelength of 540 nm to 560 nm,The energy between 540 nm and 560 nm has no radiative transition,which greatly reduces the luminescence intensity between the emission spectrum from 540 nm to 560 nm.