| 摘要 |
[PROBLEM] There is provided a broadband infrared light emitting device that radiates infrared light having a band broader than a conventional broadband infrared light emitting device. [MEANS FOR SOLVING] The broadband infrared light emitting device at least includes: a light source 4 that emits first excitation light »1 in a first wavelength range; a first glass phosphor 51 that has an excitation band in a first wavelength range, and when the first excitation light »1 is incident thereon, emits second excitation light »2 in a second wavelength range and first infrared light »3 in a third wavelength range; and a second glass phosphor 52 that has an excitation band in the second wavelength range and does not have an excitation band in the third wavelength range, and when the second excitation light »2 is incident thereon, allows the first infrared light »3 to pass therethrough and emits second infrared light »4 in a fourth wavelength range, and the broadband infrared light emitting device radiates broadband infrared light including at least a part of the third wavelength range and at least a part of the fourth wavelength range to an outside of the broadband infrared light. |
