| 简介 |
PROBLEM TO BE SOLVED : To provide a reddish white and warm-color light-emitting device having good light-emission efficiency; and to provide a fluorescent substance used in combination with a blue light-emitting element or the like and having a light-emitting spectrum in a yellow to red region.
SOLUTION : The nitride fluorescent substance represented by the general formula : LXMYN((2/3)X+(4/3)Y) : R or LXMYOZN((2/3)+(4/3)Y-(2/3)Z) : R (wherein, L is a group II element selected from the group consisting of Ca, Sr, Ba and the like; M is a group IV element selected from the group consisting of Si, Ge and the like; R is a rare earth element selected from the group consisting of Eu and the like; X, Y and Z are within the ranges of 0.5≤X≤3, 1.5≤Y≤8 and 0
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