Synthesis and Luminescent Properties of Eu³⁺- and Tb³⁺-Doped Phosphors for Solid-State Lighting

A suite of BaGaBO₄:x(Eu³⁺, Tb³⁺) new fluorescent powders fabricated via high-temperature solid phase method. These samples were characterized by XRD, SEM, and EDS. The photoluminescence results indicated that BaGaBO₄:xEu³⁺ could emit red light, and the emission spectra are 592 and 613 nm when the excitation spectrum is 394 nm. While BaGaBO₄:xTb³⁺ could emit green light, the emission spectra are 489 and 544 nm when the excitation spectrum is 242 nm. The fluorescence lifetime of BaGaBO₄:0.07Eu³⁺ is 1.782 ms, and BaGaBO₄:0.07Tb³⁺ is 2.217 ms. The CIE coordinate of BaGaBO₄:0.07Eu³⁺ is (0.633, 0.367), color purity is up to 99.7%, and PLQY is 84%. The CIE coordinate of BaGaBO₄:0.07Tb³⁺ is (0.221, 0.616), and color purity is 70.7%. At 423 K, the percentage of emission spectral intensity is 81.19% for BaGaBO₄:0.07Eu³⁺ of its initial value at 298 K, while that of BaGaBO₄:0.07Tb³⁺ is 83.89%, which show that BaGaBO₄:0.07Eu³⁺ and BaGaBO₄:0.07Tb³⁺ possess good thermal stability.