Fabricaition,Luminescent Properties And Energy Transfer Of Optical Frequency Conversion Luminescent Glass

Spectra modification has been applied in solar cells,agricultural production and biological fluorescent labels.Typically,the spectra modification relies on luminescence processes and energy transfer from luminescent centers.Therefore,it is interesting to develop new optical frequency conversion luminescent materials.Compared with other host materials,luminescent glasses present excellent optical properties,better thermal resistance,eminent mechanical properties and lower cost.The glasses are suitable for industrial production.Consequently,development of luminescent glasses has attracted persistent attention.Based on above reasons,this paper mainly carried out the following tasks:1.Luminescence and energy transfer of Sb3+/Dy3+ co-doped magnesium sodium-phosphate glasses:A series of Sb3+ and Dy3+ ions doped highly transparent magnesium sodium-phosphate glasses were successfully prepared via melt-quenching method.Their luminescent properties were systematically investigated through optical absorption,photoluminescence and decay analysis.Under deep ultraviolet excitation,through an efficient energy transfer process,the obtained co-doped glasses exhibit both a wide emission at visible band(300-700nm)of Sb3+ and characternstic emission peaks of Dyay ions.The energy transfer efficiency,luminescent quantum yield and cnromaticity coordinates were obtained.Our result shows a method for spectra modification in luminescent magnesium sodium-phosphate glasses.2.Tunable broad photoluminescence in Cu+/Mn2+ co-doped oxylluoride glasses sintered in air atmosphere:In order to explore luminescent materials for spectra modification,a series of Cu+ and Mn2+ doped oxyfluoride glasses were successfully prepared via melt-quenching method.A simple,efcient and universal method was used to gain monovalent copper ions stability in air atmosphere by adding aluminum powder as reducing agent.The luminescent properties of glasses were systematically investigated through optical absorption,photoluminescence and decay curves.Under ultraviolet excitation,Cu+ singly doped glass emits broad luminescence band,and its emission band shifts to red with increasing excitation wavelength.Through an efficient energy transfer process,Cu+-Mn2+ co-doped samples generate the varied hues from blue to white and eventually to red.Luminescent quantum yield and energy transfer efficiency were obtained.Our results demonstrate that Cu+-Mn2+ co-doped glasses have potential application in white LEDs as well as photosynthesis of green plants.3.Luminescent properties of europium doped BaMgF4 glass-ceramics:Europium doped BaMgF4 glass-ceramics were successfully fabricated by melt-quenching technique and heat treatment.Their structural properties were charactered by X-ray diffraction patterns.Their luminescent properties were systematically investigated through optical absorption and photoluminescence.Upon 392 nm excitation,all samples show the characteristic emission peaks of Eu3+.While,compared with precursor glass,the emission intensity of glass-ceramics is not enhanced.However,under 330 nm excitation,the glass-ceramics samples exhibit broad luminescence band of Eu2+,and the emission intensity is much stronger than that in precursor glass.This phenomenon can be ascribed to the incorporation of Eu2+ into BaMgF4 nano-crystals.Our results demonstrate that europium single-doped BaMgF4 glass-ceramics have potential application in photosynthesis of green plants.