Synthesis and photoluminescence properties of CaMgAl₁₀O₁₇:Sm³⁺ phosphor for n-UV solid-state lighting

The combustion method is used to synthesize CaMgAl₁₀O₁₇:Sm³⁺ phosphor. The scanning electron microscopy and photoluminescence properties of phosphors are thoroughly investigated. The emission spectrum has three distinct peaks at 563, 604 and 642 nm under 405 nm excitation, which corresponds to the transitions ⁴G_5/2 → ⁶H_5/2, ⁴G_5/2 → ⁶H_7/2 and ⁴G_5/2 → ⁶H_9/2 of Sm³⁺ ions. The optimum concentration of Sm³⁺ in CaMgAl₁₀O₁₇ phosphor is found to be 1 mol%, above which concentration quenching is observed. The CIE coordinates for the CaMgAl₁₀O₁₇ phosphor with Sm³⁺ ion doping are 604 nm (x = 0.644, y = 0.355) falling in the red region. According to the current findings, CaMgAl₁₀O₁₇:Sm³⁺ phosphors might be useful in the fields of near UV-excited solid-state lighting.