A borate compound was adopted as a new host material of Eu 3+ and Tb 3+ activators to fabricate efficient luminescence materials. The phosphor compositions, Gd 1−x Eu x Ca 3 (GaO) 3 (BO 3 ) 4 and Gd 1−x Tb x Ca 3 (GaO) 3 (BO 3 ) 4 , were synthesized by conventional solid-state reactions. The crystalline phases of the resulting powders were identified using an X-ray diffraction system. Their photoluminescence properties were investigated under long-wavelength UV excitation. The Eu 3+ -doped and Tb 3+ -doped GdCa 3 (GaO) 3 (BO 3 ) 4 phosphors efficiently emitted red and green light, respectively. The temperature dependency of emission intensity was measured in a range from room temperature to 150°C. The emission intensities of the red and green phosphors at 150°C are 87% and 91% of those at room temperature, respectively. In addition, the decay times of both the red and green phosphors are shorter than 3ms.