Warm white LED and its phosphor that provides orange-yellow radiation

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A phosphor providing orange-yellow radiation for use in warm white LEDs (light emitting diodes) is disclosed to include a substrate prepared from a rear-earth garnet and an activating agent prepared from cerium. The phosphor has a constant radiation maximum value under excitement of InGaN, and the total chemical stoichiometric equation of the phosphor substrate is (ΣLn)3Al5O12, in which ΣLn=Y1-x-y-z-pGdxLuyYb+3zEu+3p. The activating agent can be Ce (Cerium), Pr (Praseodymium), Dy (Dysprosium), Er (Erbium), or Sm (Samarium). In InGaN LED application, the phosphor assures high radiation strength and high optical output efficiency within 50˜80 lm/w. The invention also discloses a warm white LED using the phosphor.