Luminescence Properties Of Rare-earth Doped Phosphor Materials SrY₂O₄/Sr₂YF₇ Under 1550nm Excitation

Synthesis and properties of co-doped rare earth ions upconversion luminescence materials have been the focus of scientific research workers in many years.In numerous scientific research works,there're rare reports about 1550 nm laser used as excitation source but most researchers used 980 nm laser as excitation source when studying the properties of upconversion luminescence materials.Thereby,in this paper,the upconversion luminescence materials of SrY₂O₄/Sr2YF7 have been prepared by different methods and we mainly studied its luminescence properties under 1550 nm excitation.The major works are shown as follows:1.SrY₂O₄:Er³⁺,Er³⁺/Yb³⁺ upconversion luminescence materials have been prepared by solid reaction method.The doped samples emit green emission under 980 nm excitation,but when the concentration of doping Er³⁺ ion reaches a certain value,the samples emit red emission.The IR/IG value of co-doped samples increases with the doping Yb³⁺ concentration and decreases with the excitation power.In the case of 1550 nm excitation,the doped and co-doped samples show high pure color and brightness,the IR/IG value of co-doped samples increases with Yb³⁺ concentration and excitation power.The color of the proposed phosphors can be efficiently tuned by tailoring both the altered composition,excitation sources and excitation power.2.SrY₂O₄:Tm³⁺/Yb³⁺upconversion luminescence materials have been prepared by solid reaction method.In the case of 980 nm excitation,samples emit the blue emission and luminescence spectrum studies showed that violet peaks,blue peaks,red peaks and near-infrared peaks of upconversion emissions are located at approximately 350-380 nm,450-510 nm,640-700 nm and 750-850 nm,respectively.The blue and near-infrared emissions intensity are the strongest.The study shows that the blue emission intensity increases with the increasing doping Yb³⁺ion concentration.3.Er³⁺/Yb³⁺ co-doped Sr2YF7 nanostructure materials were successfully synthesized via a moderate hydrothermal method.The green and red peaks of upconversion emissions are located at approximately 510-536 nm,537-565 nm,630-675 nm under 980 nm and 1550 nm excitations,the samples emit red emission.Thereby,the red emission intensity is the strongest.The average particle size is about 35 nm of different doping concentrations nanostructure materials by scanning electron microscopy.From the spectra,the emission intensity is stronger with bigger particle sizes,on the contrary,the emission intensity is weaker with smaller particle size,relatively.