Acquisition Of Adjustable Borate Phosphor And Its Property Based On Energy Transfer

In this paper,two kinds of borate,LiBaBO₃ and Ba₂B₂O₅,were synthesized by solid state reaction.serials of rare earth ions Eu²⁺,Eu³⁺,Tb³⁺,Ce³⁺,Sm³⁺,Dy³⁺ and transition metal ion Mn²⁺ doped LiBaBO₃ and Ba₂B₂O₅ are synthesized.The microstructure or macrostructure,X-ray diffraction,energy transfer,fluorescent properties,chromaticity coordinates were analyzed and studied.The main research contents are as follows:?1?A series of LiBaBO₃:RE(RE=Eu²⁺/Tb³⁺/Eu³⁺)phosphors have been synthesized using the high-temperature solid-state reaction method.The X-ray diffraction?XRD?,emission spectra,excitation spectra,decay lifetimes,and diffuse reflection spectra were utilized to characterize the phosphors.The as-prepared samples have been characterized via XRD measurement and showed that Eu²⁺/Tb³⁺/Eu³⁺ can be efficiently doped into the host.The obtained phosphors can emit different colors of light when doping with different activators.The energy transfer from Tb³⁺ to Eu³⁺ occurs in LiBaBO₃:0.03Eu³⁺,y Tb³⁺ prepared in the air.While an abnormal reduction phenomenon was reported when Eu and Tb ions were co-doped in LiBaBO₃ and prepared in an inferior reductive atmosphere,which showed tunable-color from blue to red based on energy transfer of Eu²⁺-Tb³⁺-Eu³⁺ ions.And the energy transfer not only can occur between Eu²⁺ and Tb³⁺ ions,but also between Tb³⁺ and Eu³⁺ ions.All these results reveal that Tb³⁺ can play the role of storing the energy for Eu³⁺,and LiBaBO₃ may be a potential candidate phosphor for LEDs..?2?A series of single-phase LiBaBO₃:Ce³⁺,AR(R = Eu²⁺,Mn²⁺,Dy³⁺,Sm³⁺,Tb³⁺)and LiBaBO₃:Tb³⁺,BE(E = Mn²⁺,Dy³⁺,Sm³⁺)phosphors were prepared via a high-temperature solid-state method.The structure and luminescence properties of the phosphors are described.The optical property and energy transfer mechanism between Ce³⁺/Tb³⁺ and the rare earth ons or transition metal ion(Mn²⁺)are investigated in detail.The energy transfer,from Ce³⁺ to other ions,is attributed to the dipole–dipole interaction.The separation of the excitation spectrum and the quenching of ⁵D₃ within Tb³⁺ can be influenced by the ions.More importantly,tunable emission colors are obtained from deep pink to yellow when ions were co-doped with Ce³⁺/Tb³⁺ during their sensitization in LiBaBO₃,indicating LiBaBO₃ may be a potential phosphor in LED?Lightemitting diode?application.?3?A series of Ba₂B₂O₅: RE(RE=Ce³⁺/Tb³⁺/Sm³⁺)phosphors were synthesized using high-temperature solid-state reaction.The X-ray diffraction?XRD?,luminescent properties,and decay lifetimes are utilized to characterize the properties of the phosphors.The obtained phosphors can emit blue,green,and orange-red light when single-doped Ce³⁺,Tb³⁺,and Sm³⁺.The energy can transfer from Ce³⁺ to Tb³⁺ and Tb³⁺ to Sm³⁺ in Ba₂B₂O₅,but not from Ce³⁺ to Sm³⁺ in Ce³⁺ and Sm³⁺ codoped in Ba₂B₂O₅.However,the energy can transfer from Ce³⁺ to Sm³⁺ through the bridge role of Tb³⁺.We obtain white emission based on energy transfer of Ce³⁺ ? Tb³⁺ ? Sm³⁺ ions.These results reveal that Ce³⁺/Tb³⁺/Sm³⁺ can interact with each other in Ba₂B₂O₅,and Ba₂B₂O₅ may be a potential candidate host for white-light-emitting phosphors.?4?A series of Sr/Ca/Mg/Zn replaced Ba in Ba₂B₂O₅:Ce phosphors were obtained using high-temperature solid-state reaction.The X-ray diffraction?XRD?and luminescent properties are utilized to characterize the properties of the phosphors.The best excitation of this series of phosphors is located near 360 nm by studying the detailed analysis of the emission spectrum and the excitation spectrum.The emission spectra are all redshift with the replacement of Ba ions by the four small radii ions at the beginning,and then the emission spectra gradually blue shift with the bigger replacement.In addition,the color of the sample changed little as the Ba ions were gradually replaced by small radii.Thus,through experiments,a method of fine-tuning the sample emission color was obtained.