US 12,232,847 B2
Wavelength converter; and light emitting device, medical system, electronic apparatus, and inspection method using same
Takeshi Abe, Osaka (JP); Shozo Oshio, Osaka (JP); and Mitsuru Nitta, Kyoto (JP)
Assigned to Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Appl. No. 17/604,419
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Feb. 19, 2020, PCT No. PCT/JP2020/006524
§ 371(c)(1), (2) Date Oct. 17, 2021,
PCT Pub. No. WO2020/217671, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-082925 (JP), filed on Apr. 24, 2019.
Prior Publication US 2022/0175250 A1, Jun. 9, 2022
Int. Cl. H01S 5/00 (2006.01); A61B 5/00 (2006.01); A61N 5/06 (2006.01); A61N 5/067 (2006.01); C09K 11/77 (2006.01)
CPC A61B 5/0071 (2013.01) [A61N 5/062 (2013.01); A61N 5/067 (2021.08); C09K 11/7708 (2013.01); C09K 11/7774 (2013.01); C09K 11/7776 (2013.01); H01S 5/0087 (2021.01); A61B 2503/40 (2013.01); A61N 2005/0663 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A wavelength converter, comprising:
a first phosphor activated with Cr3+; and
a second phosphor activated with at least one ion of Ce3+ or Eu2+, wherein
a fluorescence spectrum of a fluorescence emitted by the second phosphor has a peak where a fluorescence intensity shows a maximum value in a wavelength range of 500 nm or more to less than 580 nm,
the wavelength converter emits a fluorescence having a light component over an entire range of 500 nm or more to less than 580 nm, and
the wavelength converter emits a light having a spectrum in which a ratio of a minimum light emission intensity to a maximum light emission intensity is 40% or less in a wavelength range of 550 nm or more to 700 nm or less,
wherein a wavelength having the maximum light emission intensity is 550 nm or more and less than 580 nm, and a wavelength having the minimum light emission intensity is 580 nm or more and 700 nm or less.