Study On The Spectral Hypochromatic Shift Of Luminescent Fiber Doped With Triphenylsulfonium Hexafluoroantimonate

The rare earth aluminium strontium luminescent fiber is an ideal photoluminescence functional material,it has the effect of absorption of visible light and glow at night.Triaryl sulfonium hexafluoroantimonate is the most widely used cationic photoinitiator,it has high photoinitability,lower internal stress,better thermal stability,strong antifriction property and chemical resistance,and capable of being decomposed by light to produce active free radicals and chromophores.At present,rare earth strontium aluminate luminescent fiber with the yellow-green light has achieved industrial production,but its luminous hue is not ideal.In order to obtain the rare earth strontium aluminate luminescent fiber with excellent blue light performance,the luminescent fiber doped with triaryl sulfonium hexafluoroantimonate was prepared,which can combine rare earth aluminium strontium material and triaryl sulfonium hexafluoroantimonate by using melt spinning technique.In this paper,the influence factors of spectrum blue shift were analyzed by various test methods,and the energy transfer mechanism of fiber was systematically studied,the main contents and relevant conclusions are as follows:?1?We preparaed triaryl sulfonium hexafluoroantimonate by the method of oxidation,substitution and substitution,and the rare earth aluminium strontium luminescent materials were prepared by microwave calcination.These luminescent materials are then modified with silane coupling agents.Finally,the luminescent fiber doped with triaryl sulfonium hexafluoroantimonate was made by melt spinning.The appearance,internal structure,tensile strength,friction coefficient and thermal properties of the fiber were studied by SEM,XRD,IR,fiber strength tester,fiber friction coefficient tester and thermogravimetric analyzer.The results showed that:The prepared luminescent fiber has good filament performance,thermal stability and crystallinity.The addition of triaryl sulfonium hexafluoroantimonate dose not cause damage to the phase structure of luminescent materials and polypropylene substrates in the fiber.The interior of the luminescent fiber has a good independence.With the increase of the concentration of triaryl sulfonium hexafluoroantimonate,the mechanical strength of the fiber in dry and wet state is weakened,the flexibility is decreased,and the dynamic and static friction coefficient become larger.?2?The luminescent properties of luminescent fiber doped with triaryl sulfonium hexafluoroantimonate were analyzed by means of an afterglow luminance tester,fluorescence spectrophotometer and spectral analyzer.The results showed that:The initial afterglow brightness of the fiber shows an increasing trend as triaryl sulfonium hexafluoroantimonate concentration reached 0.5%.However,as the concentration continues to increase,the initial brightness of the fiber begines to decay gradually.Compared with rare earth aluminium strontium luminescent fiber,the emission spectrum and luminous color of the luminescent fiber doped with triaryl sulfonium hexafluoroantimonate are relatively hypsochromic shift.?3?We prepared a variety of luminescent fiber by adding different content of raw materials,changing the spinning process and excitation conditions,and analysis the influence factors of spectrum blue shift.The results showed that:the change of rare earth aluminium strontium materials dose not affect the emission peak of luminescent fiber,and the effect of light blue-shift is not obvious.When the content of triaryl sulfonium hexafluoroantimonate reaches 0.5%,the emission spectrum shifts to the short wave,and the spectrum produces a hypochromatic shift.The luminescent color of the luminescent fiber doped with different concentrations of triaryl sulfonium hexafluoroantimonate is located in the blue light zone in the 1931 CIE chromaticity diagram.Compared with the rare earth aluminium strontium luminescent fiber,hypochromatic shift is occured in the blue-light luminescent fiber.With the increase of the content of triaryl sulfonium hexafluoroantimonate,the effect of blue-shifted is more obvious.The luminous colors of the luminescent fibers doped with triaryl sulfonium hexafluoroantimonate at different spinning temperatures are all located in the blue light region,their main wavelength dose not change much,and the spectrum also dose not hypochromatic shift.However,a blue-shift of light color occures compared with the pure luminescent fiber.With the weakening of the excitation wavelength,the emission wavelength of the luminescent fiber moves toward the short wavelength direction,hypochromatic shift occursed in the emission peak,moreover,the main wavelength of the light emission moves toward the cool tone,and the light color has a blue shift effect.?4?The energy transfer process of triaryl sulfonium hexafluoroantimonate to rare earth aluminium strontium luminescent materials exists in the luminescent fiber doped with triaryl sulfonium hexafluoroantimonate.luminescence mechanism of the luminescent fiber is more complex,its luminescent center includes the timely characterization of the two aromatic sulfide ions in triaryl sulfonium hexafluoroantimonate,the instantaneous luminescence of4f⁶5d¹-4f⁷ of Eu²⁺in the rare earth aluminium strontium luminescent materials and the glow in the trap level of luminescent material by capturing electrons.?5?The light color partition of the luminescent fiber is identified by the slope division method of 1931CIE-XYZ chromaticity space.The results showed that:the photographic values of the luminescent fiber doped with triaryl sulfonium hexafluoroantimonate is locaed in the blue light zone,the light color coordinates obtained by the slope calculation is also locaed in the blue area.The actual measured values and the slope simulation results are basically same.It is also verified that the doping of triaryl sulfonium hexafluoroantimonate could make the light-color hypochromatic shift.