Patent ID: 9062853
Filing Date: 2015-06-23
Classification: C03B,C03C,C09K,F21V,H01L

Abstract:
1. A broadband infrared light emitting device, at least comprising: a light source that emits first excitation light in a first wavelength range; a first glass phosphor that has an excitation band in the first wavelength range, and when the first excitation light is incident thereon, emits second excitation light in a second wavelength range and first infrared light in a third wavelength rage; and a second glass phosphor 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 is incident thereon, allows the first infrared light to pass therethrough and emits second infrared light tin a fourth wavelength range, wherein at least one rare earth ion as an emission center is uniformly included in a matrix glass within the first glass phosphor an the second glass phosphor, wherein 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, wherein the third wavelength range is shorter than the fourth wavelength, wherein the first glass phosphor, when the first excitation light is incident thereon, emits third infrared light in a fifth wavelength range that is longer than the fourth wavelength range, wherein the second glass phosphor does not have an excitation band in the fifth wavelength range, wherein the broadband infrared light includes at least a part of the third wavelength range, at least a part of the fourth wavelength range, and at least a part of the fifth wavelength range, wherein the at least one rare earth ion of the first glass phosphor comprises an Sm ion, and wherein the at least one rare earth ion of the second glass phosphor comprises a Yb ion and an Nd ion, and wherein the matrix glass of each of the first and second glass phosphors consists essentially of Sb