| abstract |
There is a problem that white light obtained by a blue LED and a yellow light emitting phosphor as a complementary color has insufficient color rendering properties. The complementary color of blue LED is composed of calcium (Ca), aluminum (La), silicon (Si), europium (Eu), nitrogen (N), and a general formula Ca 1-x AlSi 4 N 7 : Eu x (0 By using a yellow light emitting phosphor represented by .001 <x ≦ 0.15), warm white paper light can be obtained. [Selection figure] None |