Tunable luminescence and energy transfer in Ca₃SiO₄Cl_2:Ce³⁺,Li⁺,Mn²⁺,Eu²⁺ phosphors

Abstract

Abstract A series of color‐tunable Ca 3–2x‐y‐z SiO 4 Cl 2 (CSC):xCe 3+ ,xLi + ,yMn 2+ ,zEu 2+ phosphors with low temperature phase structure was synthesized via the sol–gel method. An energy transfer process from Ce 3+ to Mn 2+ in CSC:0.01Ce 3+ ,0.01Li + ,yMn 2+ (y = 0.03–0.09) and the mechanism was verified to be an electric dipole–dipole interaction. The Ce 3+ and Mn 2+ emission intensities were greatly enhanced by co‐doping Eu 2+ ions into CSC:0.01Ce 3+ ,0.01Li + ,0.07Mn 2+ phosphors due to competitive energy transfers from Eu 2+ /Ce 3+ to Mn 2+ , and Ce 3+ to Eu 2+ . Under 332 nm excitation, CSC:0.01Ce 3+ ,0.01Li+,0.07Mn 2+ ,zEu 2+ (z = 0.0005–0.002) exhibited tunable emission colors from green to white with coexisting orange, green and violet‐blue emissions. These phosphors could have potential application in white light‐emitting diodes.