Orange-yellow phosphor and warm white LED using the same

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A phosphor providing orange-yellow radiation is prepared from a cerium activated rare-earth garnet substrate that contains Li (lithium), Si (silicon), N (nitrogen) and F (fluorine) atoms, obtaining the overall stoichiometric equation of (ΣLn)3Al5-x-yLiy/3Mgx/2Si(x/2+2y/3)Fq/2O12-qNq/2. When the activating wavelength is 440˜475 nm, the orange sub-energy band becomes 542˜590 nm, and the radiation quatum ouput q>0.9, showing a cubic crystal garnet structure. The phosphor has color coordinate Σ(x+y)≧0.89, and color purity α≧0.89. The invention also provides a warm white LED that has light intensity J≧300 cd, half open angle 2θ≧60°, luminous efficiency 65≦ζ≦100 lm/W, and color temperature within 2800≦T≦5500K.