Synthesis and photoluminescence properties of CaMTiO 3 :0.12Eu 3+ (M = Mg, Sm) red phosphors for lighting application

摘要: The xMg2+/ySm3+ ions co-doped CaTiO3:0.12Eu3+ red phosphors were synthesized by solid-state reaction method and their structure, crystalline morphology, luminescent properties, decay curves quantum efficiency investigated in detail. XRD patterns show these have an orthorhombic perovskite structure when the sintering temperature was 1350 °C. From photoluminescence spectra, two excitation peaks observed located at 397 nm (7F0 → 5L6) 465 nm (7F0 → 5D2), there are prominent emission around 595 nm (5D0 → 7F1) 616 nm (5D0 → 7F2) corresponding to magnetic dipole transition electric of Eu3+ respectively. properties improved adjusting Mg2+ Sm3+ co-doping concentration optimal doping amount found be 7 mol% 0.5 mol%. At this moment, internal measured 52.4% 47.5% respectively times 0.64 ms 0.59 ms. According quench theory, critical distance between activators CaMTiO3:Eu3+ (M = Mg, Sm) 15.27 A 15.07 A. CaTiO3:Eu3+ phosphor’s thermal stability has been a lot due introduction. When increases from 248 388 K, intensity CaMg0.07TiO3:0.12Eu3+ CaMg0.07TiO3:0.12Eu3+,0.005Sm3+ decayed only 12.1% 15.9% These experimental results indicated that can used solid state lighting devices.