Improved photoluminescence and thermal stable by charge compensation for Sr0.3Ca0.7(MoO4)2: Tb3+, Eu3+ red-emitting phosphors

Sr0.3Ca0.7(MoO4)(2): Tb3+, Eu3+ phosphors have been synthesized by way of the coprecipitation method. X-ray diffraction, luminescence properties, charge compensation, and thermal extinguishing behavior of Sr0.3Ca0.7(MoO4)(2): Tb3+, Eu3+ were investigated. The color coordinates of sample #8 were (0.6258, 0.3331) and are located in the red border region. Upon 379 and 395 nm excitation, the emission intensity of Eu3+ (D-5(0)-> F-7(2)) was improved by charge compensation. The energy-transfer mechanism of Tb3+ to Eu3+ ions in Sr0.3Ca0.7(MoO4)(2) matrix was determined to be the dipole-dipole interaction. The temperature-dependent photoluminescence spectra suggested that the Sr0.3Ca0.5875(MoO4)(2): 0.05Tb(3+), 0.025Eu(3+) phosphor with charge compensation possessed superior thermal stability than the Sr0.3Ca0.625(MoO4)(2): 0.05Tb(3+), 0.025Eu(3+) phosphor without charge compensation, and the activation energy was 0.381 eV.