Preparation And Optical Properties Of Highconcentration NV Color Centers In Diamond

Today's society is in the process of rapid development,and countless technologies that adapt to the development of the times have also emerged.Quantum information technology is undoubtedly a very important field at the current stage of development.Therefore,it has attracted the attention of countless researchers.Achievements in the information field also appear frequently.At present,science and technology and experimental methods in various industries and fields are constantly improving and progressing.Correspondingly,various verification and detection methods also play an irreplaceable role in the process of progress and improvement.Therefore,various types of Detection is irreplaceable.In this case,various probe technologies have developed accordingly.There are many kinds of substances that can be used as probes,and the types of probes are also very rich.Of course,the scope of application of each probe is different,so the research on probe materials is indispensable.The nitrogen vacancy color center(NV color center)in diamond is an excellent carrier of quantum information,and it is also an excellent probe material.This is because the performance of the NV color center is excellent,the structure is very stable,the zero-phonon line is visible at room temperature,the coherence time is long,and the spin state can be controlled by microwave and light.This dissertation has studied in detail how to prepare diamond samples with a high concentration of NV color centers.The steady-state fluorescence spectra of diamond samples prepared under different preparation conditions(electron irradiation dose,annealing temperature and annealing time)are compared by setting up a fluorescence measurement system.Thus,the more detailed and comprehensive methods for preparing diamond samples with high concentration of NV color center are obtained.In addition,metal-organic frameworks(MOFs=Metal-Organic Frameworks)are the new type of materials with excellent physical and chemical properties.There are also many differences in the properties of metal organic frameworks obtained by selecting different combinations of metal ions/clusters and ligands,which can meet the needs of a variety of probes.Therefore,MOFs materials as probes are also very promising material materials.This thesis also uses several optical systems to characterize a doped metal-organic framework(TCPP-Ui O-66),and study its linear and nonlinear optical properties.On this basis,the two-photon induced fluorescence method was used to calculate the two-photon absorption cross section of the doped metal-organic framework.The main contents of this dissertation are as follows:1.Treat the same batch of diamond samples with different preparation methods(electron radiation dose,annealing temperature and annealing time).Using self-built optical system platform to perform spectral characterization of the processed diamond samples to compare the fluorescence intensity,the best preparation conditions for preparing diamond samples with a high concentration of NV color centers are obtained.Finally,considering various factors,we have obtained that the annealing temperature and annealing time are 1×10¹⁸ e^-/cm²,900 degrees Celsius and 1 hour,respectively,which are the best conditions for preparing diamond samples with high-concentration NV color centers.2.In addition to the preparation conditions of the diamond NV color center,we also studied the lifetime of the NV color center.Through the characterization of time-resolved fluorescence spectroscopy and data fitting,the fluorescence lifetime of the NV color center was about 10 ns.3.Three groups of metal organic frameworks(TCPP-Ui O-66)were prepared with different TCPP doping levels,and on which characterizations were carried out using XRD technology,SEM technology,fluorescence and time-resolved fluorescence spectroscopic,and up-conversion fluorescence methods.Comparing the characterization results of single-photon steady-state fluorescence spectroscopy,we found that as the doping amount of TCPP gradually increased,the fluorescence intensity of the metal-organic framework showed a phenomenon of first increasing and then decreasing,and the fluorescence peak position showed a gradual red shift.Increasing trend.We believe that the change in fluorescence intensity is caused by the fluorescence quenching effect,and the red shift of the peak position can be explained by the HOMO-LUMO principle.Through the two-photon steady-state fluorescence spectroscopy,we confirmed that the doped metal-organic framework has the third-order nonlinear optical property of the two-photon effect,and further measured its two-photon absorption cross section by up-conversion fluorescence.