JPS5866247A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain the high color rendering properties and high luminous efficacy of a fluorescent lamp concurrently by arranging the chromaticity of luminous colors within the chromaticity range enveloped by multiple coordinate points in the 1931 x, y chromaticity coordinates based on the 1960 CIE-ucs chromaticity system. CONSTITUTION:The chromaticity of luminous colors is determined to be within the chromaticity range enveloped by the first coordinate point (x=0.346, y=0.362), second coordinate point (x=0,356, y=0.375), third coordinate point (x=0.337, y=0.352), fourth coordinate point (x=0.348, y=0.381), fifth coordinate point (x=0.359, y=0.390), and sixth coordinate point (x=0.338, y=0.370) as shown in the figure. Halo strontium phosphate activated with europium for a blue luminous phosphor, cerium .magnsium aluminate activated with terbium for a green luminous phosphor, and yttrium .vanadium silicate activated with europium for a red luminous phosphor were used in combination to produce a fluorescent lamp for trial, and a desired objective was attained to occupy within the coordinate range mentioned above.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent lamp that uses a plurality of phosphors that emit light in a relatively narrow band as a main light emitting layer, and in particular has a practically preferable color rendering property and high luminous efficiency. It is.

In the past, it was thought that it was difficult to achieve both high color rendering properties and high luminous efficiency for fluorescent lamps, but C.E. Elji proposed a method for quantitatively expressing the color rendering properties of light sources. Since then, methods for realizing a light source with high efficiency and high color rendering properties have been studied. It has been found that the above object can be achieved by using a combination of phosphors that emit light in relatively narrow regions of blue, green, and red, and a specific method has been proposed.

The FIA of the present invention was developed based on the above-mentioned circumstances, and as a result of actually evaluating two prototypes, it was found that both high efficiency and excellent color rendering properties were achieved.

As mentioned above, the combined fluorescent lamp, which is a combination of phosphors that emit light in 12 three-wavelength regions, has high efficiency and high color rendering properties.

However, when we used one unit for practical use, it became clear that there were (various) problems. That is, it has been found that although the color rendering index based on the CIE method or the JIS method based on the CIE method is reliable (two tubes), it may not necessarily be preferable for practical purposes.

In particular, the color rendering index of Japanese skin color 1C, which is specified in J Engineering Sl-Special C2, shows a high value of 90 or higher, but in reality, skin color 1C of Japanese people has a high value of 90 or more. There were many indications that there was no such thing.

Furthermore, the appearance of white objects is also an important element in this type of lamp with improved color rendering properties, and by evaluating it together with the desirability of the appearance of skin tones mentioned above, As a result of making a prototype lamp and examining it, we came to the following two conclusions.

That is, the chromaticity of the lamp is as follows:
Based on the UCS chromaticity system < 1931 s:, in the y color coordinate, if there are C2 within the range H surrounded by the 6 points below, it exhibits a practically good color rendering property of 1 to 1 for two skin colors. death,
It has been found that white objects appear white and are highly efficient.

First coordinate point x = 0.346 7 = 0.36
2 second coordinate point, f=0.356 y=0.375
Third coordinate point x = 0.337 y = 0.3
52 4th coordinate point x L-0,348y = 0.38
1'5th coordinate point x = 0.359 y =
0.390 6th coordinate point g=o, aas y=o,
a'y.

Next, a specific example will be shown.

The phosphors used and their blending ratios are as follows: 038rB(PO2)1 CaCjl: Rju
Blue emission 17wt% YB8105: Ce, T
b Green emission 66 wt %Y20@
: Ftu red light emitting 17wt
%A FTJ40 B type fluorescent lamp was manufactured using this mixed phosphor, and its chromaticity was measured.-f
= 0.347 ; ) = 0.369. Figure 1 shows the coordinates of C (η).As for its color rendering properties, the special color rendering index R15 for Japanese skin tones was 91.

Using the same phosphor as above, the mixing ratio of each is 1
When we fabricated an FI 408 fluorescent lamp with a light-emitting layer of 9vt, 63wt, and 18wt%, and measured its characteristics, the chromaticity coordinate was X = 0.346,
y=0.358. Special color rendering index R1s F
i95, which is a higher value than the first example,
When the product was put to practical use within the company, many people complained that it gave the skin an unnatural reddish tinge, which was undesirable. The phosphors shown in Examples 1 and 2 above have the following properties.

Blue phosphor Beak wavelength 45 I, half value 43
Luminous green phosphor Beak wavelength 54 1. half price width
Instead of a 1υ1polar phosphor with a peak wavelength of 611m and a half-value width of gnmKit, or as a biblue-emitting phosphor, europium-activated strontium halophosphate or part or all of strontium can be used as a phosphor. -kl or multiple types of alkaline earth metals, or europium-activated barium/magnesium aluminate with a green-emitting phosphor (7) or terbium-activated cerium-magnesium aluminate or terbium-activated silica. Yttrium silicate or cerium-terbium activated lanthanum phosphate or lanthanum phosphate activated with C nialumic acid 4 As a red-emitting phosphor, europium activated yttrium silicate, vanadium or europium activated phosphorous silicate.
It has been confirmed that the above purpose can be achieved by making the above coordinate range (=) even in a fluorescent lamp prototyped using one or more combinations of yttrium and vanadium.

Incidentally, since all of these phosphors use rare earth elements, they are inevitably expensive. As a price reduction measure, there is a method of mixing an inexpensive phosphor such as antimony/manganese-activated calcium halophosphate, non-luminescent alumina, oxidized phosphor, etc. with the above phosphor, or instead of mixing it in the glass tube that is the lamp envelope. A method is shown in which a surface is applied as a first layer and a luminescent layer of the above-mentioned mixed phosphor is provided thereon as a second layer.

As a result of investigating the characteristics and practical color rendering properties of these examples, we found that if there is little change in the spectral energy distribution of the lamp due to the influence of the substances mixed with these main emitters or formed as the first layer, for example, visible When the peak value of light emission in the wavelength range is 100 cm, the light emission intensity at wavelength 565% is 1
If the intensity of light emission is less than 5 or less than 10 at wavelengths 5253 to 31, the desired purpose can be achieved by setting the chromaticity within the range of chromaticity ii''l described above.

[Brief explanation of the drawing]

The figure is a chromaticity diagram showing the essential coordinate range of chromaticity Ffr in the fluorescent lamp 62 of the present invention and the chromaticity point of the embodiment.

Claims (1)

[Claims] A first phosphor having a peak emission wavelength of 440 to 46υI and a half-width of (5Qnm or less) and a first phosphor having a peak emission wavelength of 530 to 5603 m and a half-width of 1
The second phosphor is 5 nm or less, the peak wavelength of emission is 600 to 625 nm, and the half width is 10F&7.
The main luminescent layer is a luminescent layer coated with a third phosphor having a luminance of 1 or less, and the chromaticity of the luminescent color is 1960C E.
Based on the -uce chromaticity system < 1931z. A fluorescent lamp characterized in that it lies within a chromaticity range surrounded by the following six coordinate points in the y chromaticity coordinate L-. First coordinate A x = 0.346 y = 0.
362 second coordinate point x = 0.356 y = 0
．． 375 3rd coordinate point! =0.337 y=Q, 3
52 4th coordinate point x = 0.348 9 ” 0.
381 5th coordinate point x = 0.359 7 =
0.390 6th coordinate point,? =0.33B y=0
．． 370