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Novel red-emitting Eu3+, Sm3+ singly doped and co-doped Ca14Mg2(SiO 4)8 phosphors were prepared by conventional solidstate reaction. Powder X-ray diffraction patterns were employed to confirm phase purity. Ca14Mg2(SiO 4)8:Eu3+ phosphors exhibited intense red emission under 394 nm excitation and Ca14Mg2(SiO 4)8:Sm3+ phosphors, excited at 405 nm, also showed strong red emitting at 602 nm. The concentration quenching mechanism of Ca14Mg2(SiO 4)8:Eu3+ was dipole-dipole interaction, while that of Ca14Mg2(SiO 4)8:Sm3+ was energy migration among nearest neighbor ions. The results indicated that Ca14Mg2(SiO 4)8:Eu3+ and Ca314Mg2(SiO 4)8:Sm+ were promising red-emitting phosphors for WLEDs. Meanwhile, the effect of co-doping Sm3+ ions on photoluminescence properties of Ca14Mg2(SiO 4)8:Eu3+ was studied and energy transfer from Sm3+ to Eu3+ was discovered in Eu3+, Sm3+ co-doped phosphors.
Novel red-emitting Eu3 +, Sm3 + singly doped and co-doped Ca14Mg2 (SiO 4) 8 phosphors were prepared by conventional solid state reaction. Powder X-ray diffraction patterns were used to confirm phase purity. Ca14Mg2 (SiO 4) 8: Eu3 + intense red emission under 394 nm excitation and Ca14Mg2 (SiO 4) 8: Sm3 + phosphors, excited at 405 nm, showing strong red emission at 602 nm. The concentration quenching mechanism of Ca14Mg2 (SiO 4) 8: Eu3 + was dipole-dipole interaction , while that of Ca14Mg2 (SiO 4) 8: Sm3 + was energy migration among nearest neighbor ions. The results indicated that Ca14Mg2 (SiO 4) 8: Eu3 + and Ca314Mg2 (SiO 4) 8: Sm + were promising red-emitting phosphors for WLEDs. The effect of co-doping Sm3 + ions on photoluminescence properties of Ca14Mg2 (SiO 4) 8: Eu3 + was studied and energy transfer from Sm3 + to Eu3 + was discovered in Eu3 +, Sm3 + co-doped phosphors.