Title:
LIGHT EMITTING DEVICE, ILLUMINATION DEVICE AND PLANT CULTIVATION METHOD
Document Type and Number:
Japanese Patent JP2019102806
Kind Code:
A
Abstract:
To provide a light emitting device and an illumination device.SOLUTION: A light emitting device includes: a light emitting element having a light emission peak wavelength in a wavelength range of 380 nm or more and 490 nm or less; a first fluorescent material which is excited by light from the light emitting element to emit light having at least one light emission peak wavelength in a wavelength range of 580 nm or more and less than 680 nm; and a second fluorescent material which is excited by light from the light emitting element to emit light having at least one light emission peak wavelength in a wavelength range of 680 nm or more and 800 nm or less. A ratio R/B of a photon flux R of red light in a wavelength range of 620 nm or more and less than 700 nm to a photon flux B of blue light in a wavelength range of 400 nm or more and 490 nm or less is more than 4 and 50 or less, and a ratio R/Fr of the photon flux R to a photon flux Fr of far-red light in a wavelength range of 700 nm or more and 780 nm or less is 0.1 or more and 10 or less. The second fluorescent material contains at least one fluorescent material selected from the group consisting of a first aluminate fluorescent material and a second aluminate fluorescent material.SELECTED DRAWING: Figure 8
Inventors:
AMIYA MIKA
FUJIO KAZUSHIGE
SUZUKI TOMOKAZU
FUJIO KAZUSHIGE
SUZUKI TOMOKAZU
Application Number:
JP2018214919A
Publication Date:
June 24, 2019
Filing Date:
November 15, 2018
Export Citation:
Assignee:
NICHIA KAGAKU KOGYO KK
International Classes:
H01L33/50; A01G7/00; C09K11/08; C09K11/64; C09K11/68; C09K11/80
Domestic Patent References:
| JP2012165665A | 2012-09-06 | |||
| JP2016121226A | 2016-07-07 | |||
| JP2017186524A | 2017-10-12 | |||
| JP2016111190A | 2016-06-20 |
Foreign References:
| WO2014125714A1 | 2014-08-21 | |||
| WO2017129351A1 | 2017-08-03 | |||
| WO2014103671A1 | 2014-07-03 |
Attorney, Agent or Firm:
Takeuchi/Ichizawa International Patent Office