Synthesis and Luminescence Properties of CaSrNb2O7∶Sm3+ Orange-Red Phosphor with High Thermal Stability
A series of orange-red emitting phosphors CaSrNb2O7∶xSm3+ (0.01≤x≤0.08)were synthesized through high-temperature solid-state reaction method,and the crystal structure,the morphology,luminescence proper-ties,and thermal stability were systematically investigated.The excitation spectrum of CaSrNb2O7∶Sm3+ phosphor consists of a broad absorption band and a series of sharp peaks,and the strongest peak excitation appears at 406 nm.Under the excitation of 406 nm,the maximum emission peak of phosphor is located at 645 nm as red emission.The optimum doped concentration of Sm3+ions is found to be 2％and corresponding quenching behav-ior can be ascribed to be electricdipole-dipole interaction according to Dexter's theory.The luminescence decay curves of the phosphors show a biexponential behavior,and the lifetime decreases with the increase of Sm3+dop-ing concentration.The luminous intensity at 423 K is approximately 93％of that at room temperature,indicating that the phosphors have good thermal stability.In addition,the color coordinates of phosphors were calculated,which belong to orange-red light-emitting area.The phosphors have a higher color purity and lower correlated col-or temperature.Therefore,the synthesized phosphors have potential application in white LEDs.
CaSrNb2O7Sm3+high temperature solid-state reactionorange-red phosphorswhite LED
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