ENVIRONMENT-FRIENDLY LIGHTING SYSTEM AND PHOSPHOR

摘要

PROBLEM TO BE SOLVED: To provide an environment-friendly lighting system and a phosphor which can be expected to further improve at least either one of plant growth inhibitory effect (photosynthesis inhibitory effect) and blooming disorder inhibitory effect, while emitting white light.SOLUTION: The invention is characterized by using Dy-containing phosphor which emits white light with a luminescence peak in the range of 470-490 nm and in the range of 570-590 nm using near ultraviolet ray with a luminescence peak in the range of 300-400 nm as an excitation light. An emission spectrum thereof does not include a light with a luminescence peak in the range of from more than 400 nm to less than 470 nm and in the range of from more than 590 nm to less than 650 nm, and hardly has luminescence in the range of 430-460 nm and 500-550 nm and 600-640 nm.SELECTED DRAWING: Figure 1