| abstract |
PROBLEM TO BE SOLVED: To provide a 258-based phosphor having improved afterglow characteristics, the phosphor-containing composition, a light emitting device, an image display device and an illumination device using the phosphor. A phosphor represented by the following formula (I): Eu 2x Tm 2y (Mg, Ca, Sr, Ba) 2-2x-2y Si 5 X 8 (I) (In the formula (I), X represents one or more elements selected from the group consisting of nitrogen and oxygen, and x and y are positive numbers satisfying any of the following (i) and (ii), respectively. Indicates. (i) 0 <x ≦ 0.02, 0.5 <x / y <2 (ii) 0.0005 ≦ x <0.005, x + y <0.025) [Selection] Figure 4 |