A series of Ca4Y6O(SiO4)(6): x%Dy3+ (x = 1, 3, 5, 7, 9) phosphors were synthesized successfully via a conventional solid-state method at high temperature. The X-ray diffraction results show that all obtained samples are the pure hexagonal crystal structure of the space group P6(3)/m (No.176). The blue (F-4(9/2) -> H-6(15/2)) and yellow (F-4(9/2) -> H-6(13/2)) emissions of Ca4Y6O(SiO4)(6):7% Dy3+ phosphors are of such a ratio to produce almost perfect white light with CIE coordinates of (0.330, 0.339). The correlated color temperature is about 5600 K, close to that of the midday sunlight (5500 K). In addition, both the emission intensity and the CIE coordinates exhibit an excellent thermal stability in the temperature range of RT similar to 300 degrees C. Our study illustrates that Ca4Y6O(SiO4)(6):7% Dy3+ may serve as potential warm white lighting phosphors in NUV-based solid state lighting and optical display applications.