Photoluminescence Research And Synthesis Of Alkaline Earth Metal Chlorosilicate Phosphors Activated With Eu²⁺

This thesis focuses on Sr₄Si₃O₈Cl₄，which doped with Mg and Ca were synthesized byhigh-temperature solid-state. The main point is that photo luminescence and temperaturecharacter of the phosphor influenced with doped ions Mg²⁺and Ca²⁺, So double color andsingle color white-light achieved with the samples. Specific research is as follows:Doped Sr₄Si₃O₈Cl₄:Eu²⁺with Mg and Ca to change the crystal field of Eu²⁺4f-45d,Phase purities of M_xSr_4-xSi₃O₈Cl₄:Eu²⁺（M=Mg, Ca） are examined on XRD, andluminescence properties of MgxSr4-xSi3O8Cl4:Eu²⁺blue-emitting phosphors andCa_xSr_4-xSi₃O₈Cl₄:Eu²⁺yellow-emitting phosphors, which can be efficiently excited bynear-ultraviolet （NUV） chips. Emphasis is placed on the explanation of the effect of Mg andCa concentration, new emitting peak appeared on the emitting spectra,450nm onblue-phosphor and580on yellow phosphor, the new peak were attributed to the split of theEu²⁺energy level. Then we mix blue phosphor Mg_0.4Sr_3.6Si₃O₈Cl₄:Eu²⁺and yellowphosphor Ca0.4Sr3.6Si3O8Cl4:Eu²⁺by special proportion, found that the mixture emitting whitelight excited by NUV（395nm）.We choose Ca0.4Sr3.6Si3O8Cl4:Eu²⁺as matrix, doped with Mg²⁺, Phase purities ofMg_xCa_0.4Sr_3.6-xSi₃O₈Cl₄:Eu²⁺are examined on XRD, luminescence properties ofMg_xCa_0.4Sr_3.6-xSi₃O₈Cl₄:Eu²⁺can be efficiently excited by NUV chips. When x=0.20.30.4,the phosphors emitting white light excited by NUV（395nm）. The temperature character isexcellent than Sr₄Si₃O₈Cl₄, so this white light emitting phosphor is a promising new kind ofphosphor in fabricated white light emitting diodes.