PHOSPHOR AND LIGHT-EMITTING DEVICE EMPLOYING THE SAME

摘要

The embodiment of the present disclosure provides a phosphor having such high luminous efficiency as to be capable of realizing a light-emitting device suffering less from color drift even when working with high power. This phosphor is a Ce-activated phosphor having a crystal structure of Sr2Si7Al3ON13, and emitting luminescence with a peak wavelength of 500 to 600 nm under excitation by light with a peak wavelength of 250 to 500 nm. The XRD profile of the phosphor measured with Cu—Kα line radiation according to Bragg-Brendano method shows diffraction lines having the intensities I0 and I1 at diffraction angles 2θs in the ranges of 31.55-31.85° and 24.75-250.5°, respectively, on the condition that the ratio of I1/I0 is 0.24 or less.

主权项

1. A phosphor comprising Ce as an activator, wherein said phosphor has a crystal structure of Sr2Si7Al3ON13 and emits luminescence with a peak in the wavelength range of 500 to 600 nm under excitation by light with a peak in the wavelength range of 250 to 500 nm, and whose XRD profile measured with Cu—Kα line radiation according to Bragg-Brendano method shows diffraction lines having the intensities I0 and I1 at diffraction angles 2θs in the ranges of 31.55-31.85° and 24.75-25.05°, respectively, on the condition that the ratio of I1/I0 is 0.24 or less.