Photonic Bandgap And Plasma Effect On The Up-conversion Luminescence Of Guest Rare Earth Ions In Photonic Crystal Inverse Opal Structure

In recent years,the conversion technology of rare-earth-doped up-conversion nanoparticles?UCNPs?has developed rapidly.Due to the unique nonlinear light-emitting process of the up-conversion nanoparticles,it has broad application prospects in infrared detection,solid-state lasers,solar cells,and biological applications.However,there are many obstacles and problems in the practical application of the up-conversion nanoparticles.For example,the up-conversion nanoparticles has a small absorption cross section,a low conversion efficiency,and a low light emission efficiency.The application of photonic crystal structure technology and plasma effect technology have become hot topics in recent years due to their excellent properties and wide application prospects.In this paper,the combination of the opal photonic crystals structure and the plasma effect was used to control the photonic crystal structure.On the conversion nanomaterial fluorescence luminescence,a fluorescence enhancement effect of 21.6 times was obtained.To provide a useful reference for exploring a new method of up-conversion fluorescence enhancement.The BaTiO₃:Yb³⁺ and Er³⁺@Ag precursors were prepared by sol-gel method,and more suitable experimental conditions were selected.After that,polystyrene microspheres with different particle sizes were prepared by soap-free emulsion polymerization to obtain high-quality basic conditions for template preparation.A modified self-assembly method was used to prepare photonic crystals with opal structure,and the thickness and quality of photonic crystals with opal structure under different conditions were explored.The precursor was filled into the template and the nanosilver was reduced by photodeposition.The template was removed and annealed.The BaTiO₃:Yb3 +,Er3 + @ Ag inverse opal structure photonic crystals with stable structure and good morphology were obtained,and its phase and luminescence are analyzed.characteristic.The specific results are as follows:Preparation of BaTiO₃:Yb³⁺,Er³⁺@Ag and BaTiO₃:Yb³⁺,Er³⁺ contrast samples by sol-gel method.It was found that when the concentration of cations in the matrix is more and the concentration is greater,the same ion effect is more likely to occur,resulting in cation precipitation.It is no longer dissolved.A clear and transparent precursor can be obtained by adjusting the p H value and the amount of solvent.By contrasting the XRD image,the higher the annealing temperature,Crystallinity and test temperature can be proportional to a certain range.For the case,the optimum annealing temperature of 750°C was obtained.?1?The change of particle size of polystyrene microspheres under the control of a single variable was explored,and the reaction mechanism was explored.The SEM images clearly show that the prepared microspheres have good monodispersity and uniform particle size.It can be concluded that the microspheres formed by controlled reaction time conditions are easy to form linear changes,which is suitable for preparing polyphenylenes with different particle sizes in this work.Ethylene microspheres.?2?By comparing the traditional vertical deposition self-assembly method with the floating vertical deposition self-assembly method,it is found that the floating vertical deposition self-assembly method has a shorter test cycle,and the advantages of better sample quality,controllable thickness and layer number,SEM The plane and cross-sectional images show that the obtained sample has stable structure,good periodicity and symmetry,stable layer-to-layer,fewer defects,very little cracking,and less surface impurities.The transmission spectrum of the opal structure was measured,and opal photonic crystals with different bandgap positions were obtained,and the relationship between the position of the band gap of the opal structure and the particle size of the microspheres was deduced.?3?The precursors were combined with the opal structure template to synthesize good BaTiO₃:Yb³⁺,Er³⁺@Ag inverse opal structure photonic crystals.The SEM images showed that the periodicity,integrity and structural stability of the samples were all outstanding.The XRD characterization results show that the crystallinity is good,and the high annealing temperature will destroy the continuity of the inverse opal structure and cause it to crack.The transmission spectrum of the sample was measured with a spectrophotometer to prepare a sample with a photon bandgap center position ranging from 440 nm to 980 nm.When the sample is excited with a 980 nm laser,525 nm green light and 660 nm red light emission can be obtained.When the sample photonic band gap center is at 460 nm,the green light 525 nm can be enhanced by 3.2 times,and the 660 nm red light can be enhanced by approximately 9 times.When the sample bandgap center is located at 498 nm,the 550 nm green light emission is enhanced by approximately 1.74 times and the 660 nm red light is enhanced.8.9 times;when the sample bandgap center position is at 980 nm,550nm green light emission is enhanced by 21.6 times,660 nm red light is increased by 10.2 times;when the sample photonic bandgap position coincides with green light emission at 525 nm and 550 nm positions,red light Enhanced 8.9 times,while 550 nm luminescence was suppressed.In this work,an innovative method was adopted to prepare plasmas and rare earth luminescent ions into inverse opal structures by preparing mixed precursors.This is different from conventional deposition in surface plasmon enhancement.Photonic band gap center Coincident with the wavelength of the excitation light field,the inverse opal structure can form photons locally in the voids of the structure and totally reflect the excitation light multiple times,improving the utilization of the excitation light field;good results are obtained and provided for Transform the new idea of fluorescence enhancement.