| abstract |
According to one embodiment, the luminescent material exhibits an emission peak within a wavelength range of 490 to 580 nm when excited by light having an emission peak within a wavelength range of 250 to 500 nm. The luminescent material exhibits a diffraction peak intensity of 2? = 30.1 to 31.1? Higher than the diffraction peak intensity of the peak detected at 2? = 25.0 to 26.0 in X-ray diffraction by the Bragg-Brendano method using Cu-K? And has a composition represented by the following formula (1): " (1) " ≪ Formula 1 > (A part of Sr may be substituted with at least one kind selected from Ba, Ca, Mg and Na, and 0 < x < = 1, -0.1? Y? 0.3, -3? Z? -0.3, -3 < uw < / = 1) |