Near infrared light storing fluorescent material, near infrared light storing phosphor, and method for producing near infrared light storing fluorescent material

摘要

PROBLEM TO BE SOLVED: To provide a light-storing fluorescent material exhibiting afterglow in a near infrared region.SOLUTION: The near infrared light-storing fluorescent material contains crystal structure of SrSnOsolid which Ndis solid dissolved. The crystal structure has lattice defects, the crystal structure is fired at a temperature of 1200°C or more, the Ndis solid dissolved at a concentration equivalent to 0.01 to 10 mol% of Sr contained in SrSnOas a mother material, or the Ndsubstitutes at least a part of the Sr.