| 简介 |
PROBLEM TO BE SOLVED : To provide a high-performance illuminating device which prevents performance decline and degradation while utilizing the characteristics of a nanocrystalline phosphor.
SOLUTION : The illuminating device 10 includes a light emitting device 4 emitting primary light and a wavelength conversion unit absorbing a part of the primary light to emit secondary light. The wavelength conversion unit includes a first wavelength conversion unit 6 containing at least the nanocrystalline phosphor and a second wavelength conversion unit 7 containing a rare-earth-activated phosphor or a transition-metal-element-activated phosphor. In the light emitting device 4, the first wavelength conversion unit 6 and the second wavelength conversion unit 7 are closely stacked in order.
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