| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light-emitting device that uses near-ultraviolet LED as an excitation source, excels in color rendering properties, and shows practical luminous efficiency. <P>SOLUTION: The light-emitting device has a primary light emitter and a secondary light emitter that emits visible light through irradiation of the light from the primary light emitter. The primary light emitter has its luminescence peak in the wavelength range of 300 nm to 420 nm, while the secondary light emitter includes a red phospher satisfying the formula [1] below, a green phospher having a luminescence peak in the wavelength range of 510 nm to 545 nm, and a blue luminescence peak in the wavelength range of 420 nm to 470 nm. The formula [1] is I<SB>570</SB>/I<SB>650</SB>≥0.3 (where I<SB>570</SB>and I<SB>650</SB>are luminescence intensities at 570 nm and 650 nm when the red phospher is excited using light with a peak wavelength of 395 nm). <P>COPYRIGHT: (C)2009,JPO&INPIT |
