Preparation,Luminescence Properties Adjustment And Application Research Of Eu²⁺/Mn²⁺ Ion-doped (Ba_1-xSr_x)₉Lu₂Si₆O₂₄ Phosphor

With the rise of energy-saving lighting,rare-earth light-emitting materials have become an indispensable basic material for energy-saving lighting.The potential of rare-earth light-emitting materials in the LED industry is becoming more and more obvious.It has become a research hotspot to adjust the luminescent properties of rare earth luminescent materials.Silicate materials have the characteristics of abundant raw materials,stable crystal structure and good thermal stability.They can be used as ideal host materials for rare earth luminescent materials.Due to the shielding effect of the outer electrons,the 4f-4f transition of the rare earth ion is less affected by the crystal field.However,the 5d electron layer is exposed outside,and its 4f-5d transition is greatly affected by the crystal field.Therefore,the effective control of rare earth ions 4f-5d can be achieved through effective design to change the local structure of the crystal.In this paper,by changing the position of rare earth ions in the host of multi-cation lattices,the controllable adjustment of the luminescence properties of rare earth luminescent materials is achieved.At the same time,the energy transfer between different rare earth ions was also studied in this thesis,and a single phase phosphor with excellent properties was synthesized.The main research results of this paper are as follows:1.A series of Sr-doped(Ba_1-xSr_x)₉Lu₂Si₆O₂₄:Eu²⁺?0?x?0.4?phosphors were synthesized by high temperature solid-phase method.Sr²⁺can be well incorporated into the lattice to form solid solution,the solid solution limit is x=0.4.(Ba_1-xSr_x)₉Lu₂Si₆O₂₄:0.03Eu²⁺?0?x?0.4?series phosphors have broadband absorption and emission.The introduction of Sr²⁺successfully induced the redistribution of Eu²⁺occupancy,making Eu²⁺from preferentially occupying the twelve-coordinated AE?1?sites to preferentially occupying the nine-coordinated AE?2?sites and ten-coordinated AE?3?sites.The emission peak position of the sample gradually transitions from the blue region to the green region,which realizes the controllable adjustment of the emission color.At the same time,the thermal stability of the phosphor was systematically studied,the introduction of Sr²⁺greatly improves the thermal stability of the phosphor.Use this series of phosphors to prepare LED devices and test their performance.2.A series of(Ba_0.9Sr_0.07-y)₉Lu₂Si₆O₂₄:0.03Eu²⁺,yMn²⁺phosphors were synthesized by a high-temperature solid-phase method.The broadband emission spectra showed three emission peaks at 460,520,and 595 nm.Its range covers almost the entire visible light region.By changing the Mn²⁺ion doping concentration,multi-color luminescence is achieved.It is confirmed that the energy transfer mechanism between Eu²⁺and Mn²⁺ions is a dipole-dipole interaction.An LED device was prepared using this sample,and the device performance was tested.