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Light emitting device and plant cultivation method

  • US 10,700,243 B2
  • Filed: 03/13/2019
  • Issued: 06/30/2020
  • Est. Priority Date: 03/14/2018
  • Status: Active Grant
First Claim
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1. A light emitting device comprising:

  • a light emitting element having an emission peak wavelength in a range of 380 nm or more and 490 nm or less; and

    a red fluorescent material which is excited by the light from the light emitting element to emit light having at least one light emission peak wavelength in a range of 580 nm or more and 680 nm or less, whereina ratio of a photon flux R of red light in a range of 620 nm or more and 700 nm or less to a photon flux B of blue light in a range of 400 nm or more and 490 nm or less, R/B, is in a range of more than 20 and 200 or less.

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