Synthesis and Luminescent Properties of Eu 3+ ‐ and Tb 3+ ‐Doped Phosphors for Solid‐State Lighting

A suite of BaGaBO 4 : x (Eu 3+ , Tb 3+ ) new fluorescent powders fabricated via high‐temperature solid phase method. These samples were characterized by XRD, SEM, and EDS. The photoluminescence results indicated that BaGaBO 4 : x Eu 3+ could emit red light, and the emission spectra are 592 and 613 nm when the excitation spectrum is 394 nm. While BaGaBO 4 : x Tb 3+ could emit green light, the emission spectra are 489 and 544 nm when the excitation spectrum is 242 nm. The fluorescence lifetime of BaGaBO 4 :0.07Eu 3+ is 1.782 ms, and BaGaBO 4 :0.07Tb 3+ is 2.217 ms. The CIE coordinate of BaGaBO 4 :0.07Eu 3+ is (0.633, 0.367), color purity is up to 99.7%, and PLQY is 84%. The CIE coordinate of BaGaBO 4 :0.07Tb 3+ is (0.221, 0.616), and color purity is 70.7%. At 423 K, the percentage of emission spectral intensity is 81.19% for BaGaBO 4 :0.07Eu 3+ of its initial value at 298 K, while that of BaGaBO 4 :0.07Tb 3+ is 83.89%, which show that BaGaBO 4 :0.07Eu 3+ and BaGaBO 4 :0.07Tb 3+ possess good thermal stability.