A new deluxe fluorescent lamp with a color rendering index of 99

概要

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Fluorescent lamps were studied to improve color rendering property without the use of filter to absorb blue-violet radiations.The general color rendering index (Ra) is possible to be raised effectively, when are controlled both blue-violet mercury lines and continuous radiations emitted from phosphors.A new strontium-borophosphate phosphor, with a chemical formula of [2 (Sr, Eu) O・0.84P_2O_5・0.16B_2O_3], was developed and its application in fluorescent lamp of accurate color rendition was examined. This phosphor absorbs not only ultra-violet radiation but also the visible blue radiation and emits bluish green light, having lower radiant power in blue-violet spectral region than usual antimony activated calcium halophosphate phosphor.The use of this phosphor is very effective to control the radiant power in blue-violet spectral region, and makes it possible to produce fluorescent lamps having Ra value of 99 and luminous efficacy of 60 lm/w, without the use of the filter for absorbing blue-violet radiations.