JPS60185353A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To improve the efficient and the color rendering characteristic by forming the phosphor substance layer with first to fourth phosphor substances including such substance as has the peak wavelength of 470-500nm and emits light in narrow band where the half level width is 40-75nm. CONSTITUTION:First phosphor substance having the peak wavelength of 470- 500nm and emits light in narrow band where the half level width is 40-75nm, second phosphor substance such as tin-activated positive strontium phosphate. magnesium phosphor substance, third phosphor substance such as antimony. manganese-activated alkali-earth metal halo-phosphate and fourth phosphor substance having the light emission peak in the range of 440-490nm and activated with bivalent europium are mixed then adhered to the inner wall of a glass tube to produce a fluorescent lamp. Consequently, phosphor substance such as halo-phosphate can be added to improve the lamp efficiency while to maintain high color rendering characteristic through the entire service life.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fluorescent lamp, specifically a fluorescent lamp whose color temperature is 4200.
has a value of ~5600 and has a color rendering index of J
The color rendering classification specified in ISZ9301 is EDL type,
The present invention relates to a high-quality fluorescent lamp whose light source color category satisfies each numerical value of white.

Structure of conventional examples and their problems Conventionally, the phosphor used in fluorescent lamps for general lighting is a calcium halophosphate phosphor activated with antimony and manganese, but this lamp has poor color rendering properties. Because of its low color rendering properties, its use in places where high color rendering is required, such as museums and color printing factories, is restricted. Fluorescent lamps with high color rendering properties, for example, are made by mixing several types of phosphors so as to approximate the spectral distribution of a reference light source, while using mercury lamps in the Machiibe short wavelength range, which inhibits the upward viewing of color rendering properties. An EDL-type fluorescent lamp using a so-called double-layer coating that also uses a method to suppress bright lines (Japanese Patent Publication No. 41-9868-Yumi Publication, Special Publication No. 48
-15895) is known. However, these conventional lamp manufacturing processes are complicated and the potash production efficiency is reduced, and variations in color rendering properties and reductions in lamp efficiency are unavoidable, which have been problems for many years.

In recent years, a fluorescent lamp that has improved the above-mentioned problems has been published in Japanese Patent Application Laid-open No. 5
Publication No. 4-102073 and JP-A-58-40763
It was proposed in the Publication No. 1 and has made some progress. However, the former (Japanese Unexamined Patent Publication No. 54-102073) mainly consists of a divalent europium-based strontium borophosphate phosphor and a tinned hydraulic strontium/magnesium phosphate phosphor, and has a color rendering property Ra-=99VC higher. In order to set the chromaticity of the lamp on the black body locus, a fluorescent lamp is provided which further comprises a small amount of calcium phosphate phosphor and zinc silicate phosphor:/r. However, the zinc silicate phosphor suffers from relatively large deterioration when applied to a fluorescent lamp, and therefore has the disadvantage that the special color rendering index decreases due to a decrease in the green component during the life of the lamp. On the other hand, Gonagisa (1976-40763->3 Publication) is a divalent U-
Two types of alkaline earth metal halophosphate phosphors activated with ropium and tinned hydraulic strontium/magnesium phosphate phosphors. F: Provides a fluorescent lamp that achieves high efficiency and high color rendering using a yc monomer mixture.In this case, the phosphor is a mixture of two types, so it is simple, but on the other hand, the phosphor composition is Because the emission spectrum changes easily in response to small changes, the phosphor is There is a drawback that if the emitted light color changes slightly, it becomes impossible to maintain the chromaticity of the lamp on the black body locus at a color temperature of, for example, 50 ooK.

Purpose of the Invention The present invention provides an EDL type@light lamp that eliminates the above-mentioned drawbacks, greatly improves lamp efficiency, and facilitates color matching in the lamp manufacturing process and is stable throughout its life. The present invention provides a fluorescent lamp that exhibits high color rendering properties.

Page 5 ゛Structure of the Invention The fluorescent lamp of the present invention has a peak emission wavelength of 470 nm.
m to 50 onm, and the half value of luminescence 1] is 40 nm to 75
A first phosphor that emits light in a narrow band of nm, a tinned hydraulic strontium/magnesium phosphate phosphor, and a tinned hydraulic strontium/magnesium phosphor.
a second phosphor that is at least one of a hydraulic strontium-barium-magnesium phosphate phosphor; an antimony-manganese-activated alkaline earth metal phosphate phosphor; and an antimony-activated alkaline earth metal phosphor; a third phosphor that is at least one metal phosphoric acid phosphor, and 440
It has an emission peak in the wavelength range of nm to 490 nm, and
Mixed with a fourth fluorophore labeled with a valence of europium 1
This is a fluorescent lamp characterized by coating this on the inner wall of a glass tube, which improves the lamp efficiency to a large degree, and makes it easy to match colors in the lamp manufacturing process, making it stable throughout its life. This makes it possible to provide a fluorescent lamp that exhibits high color rendering properties.

Explanation of Example 6 In order to achieve a high color rendering property with an average color rendering index Ra of 96 or more in a fluorescent lamp (/i'', adjusting the spectral distribution by using a mixture of fluorophores alone is insufficient. It is known that it is necessary to suppress the emission energy of 405 nm and 436 nm, which are mercury emission lines in the short wavelength region of the visible region.In recent years, efforts have been made to improve the efficiency of high color rendering fluorescent lamps. Materials that suppress mercury emission lines in the short wavelength region: 1. Strontium phosphate phosphor activated with divalent europium; barium calcium halophosphate activated with divalent europium; Efficiency is improved by utilizing blue-green phosphors such as magnesium phosphors and strontium-magnesium phosphors activated with divalent europium. lamps are proposed.

These blue-green phosphors activated with divalent europium have a wide half-value [1] of light emission of 80 to 120 nm, so they cannot be used with existing orange phosphors (e.g., strontium magnesila When used in combination with A), select a high-efficiency or high-brightness phosphor that does not reduce the color rendering (; There's not much room.

In other words, in these conventional technologies, the lamp efficiency is largely dependent on the luminous output of the blue-green phosphor tag and the orange phosphor, and the lamp is bright enough to have the effect of improving the lamp efficiency. This was not possible because the addition of phosphor would lower the color rendering properties of the lamp.

Based on such a small end, the present inventors developed a material for suppressing the mercury emission line, which is opposite to the conventional material (half value of /C emission [I
By using a phosphor that emits narrow blue-green light and arranging the emission toward the short wavelength side of the emission spectrum, the lamp efficiency is improved and stable and high color rendering is achieved. After conducting many experiments on combinations of fluorescent materials, we found that the blue-green emitting fluorescent material has a peak wavelength of light emission in the range of 470 nm to 500 nm, and a fluorescent material that emits light in a narrow band with a half-value rlJ of 40 nm to 75 nm. A fluorescent YT lamp constructed by selecting a light body and as described in claim 7 improves lamp efficiency compared to conventional EDL type fluorescent lamps, and exhibits stable high color rendering throughout its life. We discovered that by using a blue-green phosphor that emits light in a narrow band, as shown in the following two examples, we were able to achieve lamp efficiency in a single unit while maintaining high color rendering properties. It is now possible to select and add high-efficiency or high-luminance, stable phosphors that have been difficult to add to an extent that clearly improves lamp efficiency, thereby simultaneously achieving improvements in lamp efficiency and color rendering. "Can be done": It is a sea urchin.Here, the half value rlJ of the luminescence of the blue-green phosphor that emits light in the narrow band is 50 nm.
It has been found that it is even more effective when the temperature is ~0.0 nm. -As stated in the claims, basically four types of phosphors are used from the first phosphor to the fourth phosphor. It is clear that a light lamp has the advantage of being easy to adjust the chromaticity or color rendering property during its manufacturing process, and to easily perform color matching.

In fact, the absorption in the short wavelength region of the visible region of the blue-green phosphor that is often used in the fluorescent lamp of the present invention (and an autopsy revealed that the mercury emission line is 4369 nm) It is sufficient that the reflectance at the wavelength of 20% to 80%, preferably 40 to 75. symbol A
Experiments were conducted using a series of phosphors whose spectral reflectance was changed by changing the concentration of divalent europium, which is an activator. FIG. 1 shows the measured data of the spectral reflectance.

In Fig. 1, the curve 1ba”r, :*8 EuO,0
2 people 1140251 curve 2 l: Sr3. ,,,E
uO,08A114025' Curve 3 is Sr3,60
EuO,4”I 4 qs + curve 4 is Sr3,20
It is a spectral reflectance curve of Eu088 A11402 fi. As is clear from FIG. 1, the absorption can be controlled in the short wavelength region of the visible region of the blue-green phosphor.

The advantage of this is that in the fluorescent lamp according to the invention, a suitable blue-green phosphor can be selected depending on the lamp color temperature set. Table 1 shows the luminescent properties of typical phosphors suitably used in the present invention.

io.

11 −+ ・Figures 2 and 3 show the emission spectra of the stiff phosphor due to ultraviolet excitation. Notes in the figure - Bow (d, matches the one in Table 1.
Regarding the halophosphate phosphor shown in 5, its emission spectrum: well-known spectrum (omitted here).

Hereinafter, a practical example of the present invention will be explained.

Each color band member was mixed to prepare a tube having a tube diameter of 32 mm. Table 72 shows the type of phosphor (indicated by the flash on the first coat)
In addition, the obtained lamp characteristics are shown together with known examples.

13 and 14 As is clear from Table 2, the fluorescent lamp of the present invention has a high color rendition that is comparable to that of the conventional two-layer coated EDL type fluorescent lamp shown as a known example. It can be seen that the fluorescent lamps of Examples 1 to 4 have a lamp efficiency that is clearly similar to that of the first phosphor and [...]. It is equipped with a strontium aluminate phosphor (shown as R5A1), and has an ED
Sufficiently high color rendering properties and significantly improved as an L-type fluorescent lamp1
It can be seen that the lamp efficiency is ~. Actual MII example 5~
The reason why the improvement in lamp efficiency in the fluorescent lamp No. 9 is somewhat small is that the first phosphor No. 7 is a phosphor shown by symbol A2 or A5 in Table 1, which is currently slightly inferior in light emission output. This is due to the fact that the luminance of these phosphors can be achieved in the future, and we can fully expect an improvement in lamp efficiency.

Next, the effect of adding the fourth phosphor will be explained. In the fluorescent lamp of Example 2, a fluorescent lamp with the fourth fluorescent material, symbol D2, which accounts for 3% of the fluorescent material mixture weight ratio, was removed and a 15.7 prototype fluorescent lamp was manufactured and refined. As an example. Table 3 shows the lamp characteristics of Example 2 and Comparative Example.

(hereinafter referred to as "Kinpaku") 17 As is clear from Table 3, the lamp efficiency can be greatly improved by adding the fourth phosphor described in the claims. The second feature is that a high-intensity phosphor can be selected and used as the fourth phosphor. ′−+
Improving color rendering properties is also an advantage.

It can be seen that extremely good color rendering properties are achieved by improving VCR9 and RI2.

In fact, life tests have revealed that the fluorescent lamp of the present invention is also improved in terms of luminous flux maintenance. For example, all the fluorescent lamps shown in Examples 2-2 have a luminous flux maintenance rate of 90 to 95 cycles per 100 hours after being lit for 3000 hours, and the luminous flux maintenance rate of the known fluorescent lamps ( Clearly improved compared to Section 85 to Section 88), l″12
was. The spectral distribution of the fluorescent lamp of Example 2 is shown in FIG.

DETAILED DESCRIPTION OF THE INVENTION As per the detailed description of the invention, the fluorescent lamp of the present invention has a color rendition (
9] -2, which suppresses the mercury emission line in the short wavelength region of the visible region, has a peak emission wavelength of 470 nm
It was only by using a blue-green phosphor that emitted light in a narrow range of 18:'40 nm to 75 nm that the half-width of the light emission was in the range of 18:40 nm to 75 nm. This makes it possible to select and add highly efficient and stable phosphors, such as halophosphate phosphors, which have been difficult to add to a level that clearly improves lamp efficiency. By further adding the fourth phosphor, the lamp efficiency is greatly improved, and the EDL type fluorescent lamp is stable throughout its life and has advantages in terms of color matching during the manufacturing process. This is something that can be provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the spectral reflectance of a blue-green phosphor suitably used in the fluorescent lamp of the present invention, FIG. FIG. 4 is a diagram showing the spectral distribution of the fluorescent lamp shown in Example 2 of the present invention.

Claims (1)

[Scope of Claims] A fluorescent lamp comprising an ultraviolet generating mechanism in a glass tube and a phosphor formed on the inner wall of the glass tube and emitting light in the visible light range when excited by the ultraviolet rays. The peak wavelength of light emission is between 470 nm and 500 nm, and the half-width of light emission (the width of the light emission spectrum measured at the light emission intensity at the 50th factor of the maximum light emission intensity) is between 40 nm and 76 nm.
a first phosphor that emits light in a narrow band; and a second phosphor that is at least one of a tin-activated strontium-magnesium orthophosphate phosphor and a tin-activated strontium-barium-magnesium orthophosphate phosphor. and a third phosphor which is at least one of an antimony/manganese activated alkaline earth metal halophosphate phosphor and an antimony activated alkaline earth metal halophosphate phosphor. , 440nm~4
1. A fluorescent lamp having an emission peak in a wavelength range of 90 nm and comprising a mixture of a fourth phosphor made of divalent europium 2 pbum.