| abstract |
It is intended to provide a new phosphor which is excited by visible light in a wide band and can emit near-infrared light of high intensity. A crystal phase represented by the formula (1): MCuSi 2 O 6 (wherein M is one or more of Ba, Sr and Ca) and a crystal phase represented by the formula (2): MCuSi 4 O 10 , Ba, Sr, and Ca), and the XRD pattern obtained by the powder X-ray diffraction measurement (XRD) using a CuK? Ray shows that the crystal phase of MCuSi 2 O 6 And the ratio beta of the diffraction peak intensity of MCuSi 4 O 10 to the diffraction peak intensity is 0 < beta < / = 0.50. |