Phosphor particle group and light emitting apparatus using the same

A white light emitting apparatus comprising:na light emitting element of a gallium nitride-based semiconductor emitting primary light having a peak wavelength of 440-470 nm; anda light converter absorbing a part of said primary light to emit secondary light having a wavelength longer than a wavelength of said primary light,said light converter including a phosphor particle group of divalent europium-activated oxynitride green light emitting phosphor which is a β-type SiAlON substantially represented by a general formula:nEuaSibAlcOdNe,nwhere 0.005≦a≦0.2, b+c=12, d+e=16,said phosphor particle group of divalent europium-activated oxynitride green light consisting of a columnar particle in which a value obtained by dividing a longer particle diameter by a shorter particle diameter is greater than 1.0 and not greater than 3.0, andthe light converter further comprising phosphor particles of a red light emitting phosphor.

A white light emitting apparatus comprising:na light emitting element of a gallium nitride-based semiconductor emitting primary light having a peak wavelength of 440-470 nm; anda light converter absorbing a part of said primary light to emit secondary light having a wavelength longer than a wavelength of said primary light,said light converter including a phosphor particle group of divalent europium-activated oxynitride green light emitting phosphor which is a β-type SiAION substantially represented by a general formula:nEuaSibAlcOdNe,nwhere 0.005≦a≦0.2, b+c=12, d+e=16,wherein 60% or more of the phosphor particle group of divalent europium-activated oxynitride green light is composed of columnar phosphor particles in which a value obtained by dividing a longer particle diameter by a shorter particle diameter is greater than 1.0 and not greater than 3.0, andthe light converter further comprising phosphor particles of a red light emitting phosphor.