<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The title phosphors are prepared by solid state reaction using CaCO<sub>3</sub>, M<sub>2</sub>CO<sub>3</sub> (M: Li, Na, K), TiO<sub>2</sub>, Eu<sub>2</sub>O<sub>3</sub>, and Bi<sub>2</sub>O<sub>3</sub> as source materials (600 °C for 5 h and 1350 °C for 4 h in air).</p> </abstract>