Importance

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Abstract

A nitride fluorescent material containing at least one element selected from the group consisting of Ca, Sr, Ba and Mg, at least one element selected from the group consisting of Li, Na and K, at least one element selected from the group consisting of Eu, Ce, Tb and Mn, Al and N is provided, wherein when the maximum value of absorbance in 450 cm⁻¹ or more and less than 900 cm⁻¹ is taken as 1 in an FT-IR spectrum, an integrated value Z1 of a domain surrounded by a base line A connecting absorbance values at 1,200 cm⁻¹ and 1,600 cm⁻¹ and an absorbance spectrum of 1,200 cm⁻¹ or more and less than 1,600 cm⁻¹ is 4.0 or less, and/or an integrated value Z2 of a domain surrounded by a base line B connecting absorbance values at 2,700 cm⁻¹ and 3,680 cm⁻¹ and an absorbance spectrum of 2,700 cm⁻¹ or more and less than 3,680 cm⁻¹ is 5.0 or less.

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First Claim