White-light technologies such as white light-emitting diodes (WLEDs) are environmentally friendly and produce high luminous brightness with low energy consumption. However, their low color rendering index result in limited white-light quality caused by a deficiency in the red emission of the materials. Consequently, new luminescent materials (<i>i.e.</i>, phosphors) that produce efficient red light are needed. To enhance white-light technologies, phosphors with tunable photoluminescence, high efficacy, and high stability are required. Here, we describe the crystallography, phase stability, and luminescence response of Ca<sub>4-x</sub>Sr<sub>x</sub>LaO(BO<sub>3</sub>)<sub>3</sub>:Eu<sup>3+</sup> phosphors. The phosphors were synthesized by a simple solution combustion method with a subsequent calcination step at temperatures up to 1200°C. The resultant europium-doped phosphors exhibited a red luminescence under varying near UV and blue light excitations. The phase stability, determined from X-ray diffraction, and variations of photoluminescence and cathodoluminescence with respect to strontium content will be described.