| 摘要 |
A phosphor providing orange-yellow radiation is prepared from a cerium activated rear-earth garnet substrate that contains Li (lithium), Si (silicon), N (nitrogen) and F (fluorine) atoms, obtaining the overall stoichiometric equation of (SigmaLn)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 quantum output q>0.9, showing a cubic crystal garnet structure. The phosphor has color coordinate Sigma(x+y)>=0.89, and color purity alpha>=0.89. The invention also provides a warm white LED that has light intensity J>=300 cd, half open angle 2theta>=60°, luminous efficiency 65 <=zeta<=100 lm/W, and color temperature within 2800<=T<=5500K.
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