Study On Luminescence Process And Energy Transfer Of Oligo (Styrene) Single Crystal Nanowires

The solid-state luminous efficiency of the doped crystal is higher than that its single crystal,and it has great application value in organic light-emitting devices.Trans-distyrylbenzene?TDSB?crystals and 4-dicyanomethyl-2-methyl-6-?p-dimethylaminestyrene?H-pyran?DCM?dyes that are two excellent organic semiconductor laser working substances.In this paper,TDSB single crystal nanowires are selected as the host,and DCM dye molecules are used as guests.Through fluorescence spectroscopy and temperature change technology,the light emission process of TDSB single crystal nanowires and DCM dye molecules in the solid state mechanism PMMA?methyl methacrylate?and the energy transfer process between host and guest under the condition of DCM dye-doped TDSB crystal are discussed,the main research results are as follows:1)The luminescence process of host TDSB single crystal nanowires at different temperatures was studied.It was found that the peak position of the TDSB crystal gradually shifted red as the temperature band gradually narrowed as the temperature increased.When the temperature decreases,the lifetime and fluorescence quantum efficiency of the TDSB single crystal gradually increase,which is related to the change of the non-radiation rate constant K_nrr and the radiation rate constant Kr of the TDSB crystal.2)The fluorescence of DCM dye molecules in PMMA matrix was studied at different thermodynamic temperatures.The changes in matrix polarity of DCM samples with a mass fraction of 1%and 5%samples during temperature decrease were discussed.At the same time,we also found that during the temperature decrease,the non-radiative rate constant K_nrr of the DCM dye molecules gradually decreases,which will cause the DCM sample's luminous intensity and lifetime to gradually increase.3)The relationship between the energy transfer efficiency and temperature of TDSB crystals and DCM dye molecules was studied.It was found that the energy transfer rate K_ETT and the energy transfer efficiency?of the doped samples of various concentrations gradually increased with the increase of temperature.The experimental results can be explained by the exciton diffusion assisted resonance energy transfer model.In summary,we analyzes the luminescence process of TDSB crystals and DCM dye thermodynamic temperature can effectively change the excited state relaxation and energy transfer process of the material.It is very challenging to realize the energy transfer assisted stimulated radiation process under the condition of single crystal matrix.At the same time,this paper also finds that thermodynamic temperature regulation can effectively regulate the energy transfer rate between the subject and the object,so thermodynamic temperature regulation can be used as one of the strategies to achieve energy transfer auxiliary stimulated radiation.provides theoretical support for the application of these crystals in light emitting devices.