JPS6045675B2 - High color rendering fluorescent lamp - Google Patents

Description

[Detailed description of the invention] The present invention relates to a high color rendering fluorescent lamp.

More specifically, the present invention relates to a high color rendering fluorescent lamp using a novel luminescent composition as a fluorescent film. The fluorescent film of a high color rendering fluorescent lamp is made of a luminescent composition that is a mixture of blue, green, and red emitting phosphors; such a luminescent composition is used as the fluorescent film of a high color rendering fluorescent lamp. The reason is that by mixing blue, green, and red light-emitting phosphors, the color rendering index can be increased without lowering the luminous efficiency.

The blue, green and red emitting phosphors are required to have the following properties. (1) 4 for blue-emitting phosphors
30r1rr1 to 490nn], preferably 450n
around m, 510 nm to 57 nm for green-emitting phosphors
It should have a peak wavelength of 0nm1, preferably around 540nn1, and for red light-emitting phosphors, around 590nn1 to 630r1m1, preferably around 610r1m1.

(Ii) High luminance.

In particular, green-emitting phosphors have high luminance because their luminescent color matches visibility.゛(III) The half width of the emission spectrum is narrow. (Iv) Deterioration is small so that the color rendering index and luminance do not change (decrease) over time. Conventionally, terbium-activated yttrium silicate phosphor (Y2SiO.:
Tb) Cerium and terbium activated yttrium silicate phosphor (Y2SiO,:Ce,Tb), Cerium and terbium activated magnesium aluminate phosphor [(C
e,TO)MgAellOl9], cerium and terbium activated zinc aluminate phosphor [(Ce,Tb)Zn
AellOl9] etc. are known.

These phosphors best satisfy the above requirements (1) to (Iv) among currently known green-emitting phosphors. However, since a high color rendering fluorescent lamp with higher performance is always desired, the green-emitting phosphor that is a component of the phosphor film is also more fully effective than the conventionally known green-emitting phosphor. A phosphor exhibiting luminescent properties satisfying 1) to (Iv) is desired. The present invention provides a novel light-emitting composition using a phosphor as a green-emitting phosphor that has superior luminescent properties as a green-emitting phosphor for a high-color-rendering fluorescent lamp than conventionally known green-emitting phosphors for a high-color-rendering fluorescent lamp. The object of the present invention is to provide a high color rendering fluorescent lamp using a fluorescent film as a fluorescent film.

The applicant previously proposed that the compositional formula was a(Mll-X, MIIx)0.B2O3:YCe,Z
TO (However, MI is at least one of magnesium, beryllium, zinc, and cadmium, M is at least one of calcium, strontium, and barium, and A, x, y, and z are each 0 and a≦2
．． 010≦x≦0.25, 0kuy≦0.4 and 0.0
A patent application has been filed for a divalent metal borate-based phosphor containing a cerium- and terbium-activated divalent metal borate-based green light-emitting phosphor represented by 001≦z≦0.4. No. 54-99316), JP-A-56-2
(See Publication No. 4483).

The cerium- and terbium-activated divalent metal borate-based green light-emitting phosphor emits high-intensity light under ultraviolet excitation, but
Subsequent research has revealed that this phosphor is superior to the previously known green-emitting phosphors for high color rendering fluorescent lamps as a green emitting phosphor for fluorescent films of high color rendering fluorescent lamps. That is, the cerium and terbium-activated divalent metal borate-based phosphor described above exhibits green light emission with a narrow half-value width having a peak wavelength around 540 nm;
It emits light with higher brightness than the conventionally known green light emitting material for fluorescent lamps with high color rendering properties, and also exhibits less deterioration and changes in luminance over time.
It was found that there was little change (decrease) over time. By mixing appropriate amounts of this cerium- and terbium-activated divalent metal borate-based phosphor with blue- and red-emitting phosphors that have been proposed as blue- and red-emitting phosphors for high color rendering fluorescent lamps, color rendering is possible. The present inventors have discovered that it is possible to obtain a luminescent composition for fluorescent lamps with high color rendering properties, high luminance, and little change in color rendering index and luminance over time, and have completed the present invention. The high color rendering fluorescent lamp of the present invention has a green light emitting phosphor of 20 to 7%; The composition formula is (M■, Eu2 o-BAe2O3 (where M■ is beryllium, magnesium, calcium,
At least one of strontium, barium, zinc and cadmium, and b is a number satisfying the condition 2≦b≦10). The phosphor and composition contained are (Ca, ELl2+)2-PMIVp(B1-R
, MU, "j) 509C' (where M■ is at least one of beryllium, magnesium, zinc, tin and lead, M■ is at least one of aluminum, gallium, indium, thallium and bismuth,
p and r are O≦p≦0.7 and 0≦r≦0, respectively
．． The compositional formula of the phosphor contained in the divalent europium-activated calcium chloroborate phosphor is c(Mll,Eu2+)0.(1
-d) P2O5・BB2O3 (However, M■ is at least one of calcium, strontium, and barium as above, and c and d are each 0.7
5≦c≦2.30 and 0.05≦d≦0.23) A phosphor contained in a divalent europium-activated alkaline earth metal borophosphate phosphor, The composition formula is EMl[3(PO4)2・NIICf2:
Divalent europium activation represented by Eu2+ (where M is at least one of calcium, strontium and barium as above, and e and f satisfy the condition 1≦e/f≦3) The composition formula of the phosphor contained in the alkaline earth metal halophosphate phosphor is (
M■, Eu2+)3M? The composition formula of the phosphor contained in the divalent europium-activated alkaline earth metal silicate phosphor represented by I2O8 (where M is at least one of calcium, strontium, and barium as above) is (MH, ELl2
Two.

M? The phosphor and composition formula contained in the divalent europium-activated alkaline earth metal silicate phosphor represented by J2O7 (where M is at least one of calcium, strontium, and barium as above) are (Sr, Eu2.

-SBeSSi3O8Ce, (S is O≦S≦1.5
One or more phosphors selected from the blue-emitting phosphor group consisting of phosphors contained in the divalent europium-activated strontium chlorosilicate phosphor represented by Blue-emitting phosphor 3 to 40% by weight: and ■ The compositional formula is (Ln,Eu)203 (However, Ln is at least one of yttrium, gadolinium, lutetium, and lanthanum)
The compositional formula of the phosphor contained in the europium-activated rare earth oxide phosphor is (Ln,Eu)2
A red color consisting of a phosphor contained in a europium-activated rare earth oxysulfide-based phosphor represented by 02S (where Ln has the same definition as above) and a europium-activated yttrium vanadate phosphor [(Y,Eu)VO4] The phosphor film is characterized in that a mixed luminescent composition comprising 10 to 7% by weight of one or more red luminescent phosphors selected from the group of luminescent phosphors is used as a phosphor film.

The present invention will be explained in detail below.

The cerium- and terbium-activated divalent metal borate-based phosphor used as the green-emitting phosphor in the present invention is manufactured by the manufacturing method described below.

The raw material for the phosphor is a from a compound group consisting of boron oxide (B2O3) and boron compounds that can be easily converted to B2O3 at high temperatures, such as boric acid (H3BO3) meta-borous solution (■D2) and ammonium borate [(NH4)3B03]. At least one selected compound, b magnesium oxide (MgO
), beryllium oxide (BeO), zinc oxide (ZnO), and cadmium oxide (CdO), as well as MgO, which can be easily converted at high temperatures to nitrates, carbonates, sulfates, hydroxides, halides, etc. BeO, ZnO and Cd
At least one compound commonly referred to as a compound group consisting of a second compound group consisting of magnesium compounds, beryllium compounds, zinc compounds, and cadmium compounds that can be converted to O, c calcium oxide (CaO), strontium oxide (SrO), and barium oxide (BaO), as well as nitrates, carbonates, sulfates,
CaO, Sr can easily be used at high temperatures such as hydroxides and halides.
At least one compound selected from the second compound group consisting of calcium compounds, strontium compounds, and barium compounds that can be converted into O and BaO; d cerium oxide (CeO2) and nitrates, carbonates, sulfates, and halogens; at least one compound selected from the group of compounds consisting of cerium compounds that can be easily converted to oxides at high temperatures, such as At least one compound selected from the group of compounds consisting of terbium compounds that can be converted into oxides is used.

The above phosphor raw materials are stoichiometrically a(Mll-X, Mn
O)0.B2O3: YCe, ZTl) (However, MI is at least one of magnesium, beryllium, zinc, and cadmium, M is at least one of calcium, strontium, and barium, and A, x
, y and z are respectively O<a≦2.0, 0≦x≦0.
25, 0kuy≦0.4 and 0.0001≦z≦0.1
It is weighed out and mixed thoroughly so that the mixture composition formula becomes 4).

The mixing may be carried out dry using a ball mill, mixer mill, mortar or the like, or may be carried out wet in the form of a paste using hydroxy acid as a medium. In particular, from the viewpoint of luminance of the obtained phosphor, the values of the above mixed composition formula A, x and y should be 0.07≦a≦1.5, respectively. x=0 and 0.00
More preferably, 5≦y≦0.3. In addition, in the production of phosphors, fluxing agents are often added to the phosphor raw material mixture for the purpose of improving the luminance, powder properties, etc. of the phosphor obtained. ,, Ammonium chloride (NH4Ce) Ammonium fluoride (NlilF), Acidic ammonium fluoride (NH4Ce)
4llF2), ammonium bromide (NH4Br), ammonium iodide (NI(41), ammonium carbonate [(N
By adding and mixing an appropriate amount of H1)2C03, ammonium nitrate (NH4NO3), or the like as a fluxing agent to the phosphor raw material mixture, it is possible to improve the luminance of light emission. Furthermore, it goes without saying that in the above mixed compositional formula, when x=0, it is not necessary to use the above phosphor raw material c). Next, the above phosphor raw material mixture was placed in an alumina crucible.
It is filled into a heat-resistant container such as a quartz crucible and fired.

Firing is performed once at a temperature of 900 to 1100'C in air, in a neutral atmosphere such as a zero argon gas atmosphere, or a nitrogen gas atmosphere, or in a reducing atmosphere such as a nitrogen gas atmosphere containing a small amount of hydrogen gas or a carbon atmosphere. Or do it more than once. In this case, in order to ensure that the atomic valence of cerium and terbium, which are the activators, is trivalent, at least the final firing (if one firing is performed, that firing) is performed in a neutral atmosphere or in a reducing atmosphere. Preferably, it is carried out in an atmosphere. The firing time varies depending on the amount of the phosphor raw material mixture filled in the heat-resistant container, the firing temperature employed, etc., but in general, within the above firing temperature range, 0.5 to 6 hours is appropriate, and more preferably It lasts from 1 to 5 hours. Note that, before performing the above-mentioned firing, it is preferable to pre-fire the phosphor raw material mixture filled in the heat-resistant container. This pre-firing is performed for the purpose of converting each phosphor raw material into an oxide in advance and increasing the reactivity of each phosphor raw material during firing, and is generally performed at a temperature of about 400 to 800'C in air. It is done once or more than once. Pre-baking time is 0.5 to 6
The time is appropriate. After firing, the fired product obtained is processed through various operations generally employed in the production of phosphors, such as pulverization, washing, drying, and sieving, to obtain composition formula a (Mll-0
, M110) 0・B2O3: YCe, ZTO (however, MI
, M, A, x, y and z have the same definitions as above) A cerium and terbium activated divalent metal borate phosphor is obtained.

The cerium and terbium activated divalent metal borate phosphor produced as described above is similar to the conventional Y2SiOl:T
l) Phosphor, Y2SjO. :Ce, TO phosphor, (Ce
,TO) MgAellAOl9 phosphor, (Ce,TO)
Like the ZnAellOl9 phosphor, it has a peak wavelength around 540 nm, and its emission spectrum has a sufficiently narrow half-value width, making it suitable as a green-emitting phosphor for the fluorescent film of a high color rendering fluorescent lamp.

Figure 1 shows 0.86Mg0, a type of cerium- and terbium-activated divalent metal borate phosphor used in the present invention.
-B2O3: 25 of 0.11Ce, 0.06Th phosphor
It is a graph showing an emission spectrum under 3.7 nm ultraviolet ray excitation. As is clear from Figure 1, 0.86M
The g0-B2O3:0.11Ce,0.06T'b phosphor has a peak wavelength near 540r1m, which is preferable as a green-emitting phosphor for the fluorescent film of a high color rendering fluorescent lamp.
Moreover, the half-width of the emission spectrum is sufficiently narrow, and FIG. 1 shows 0.86Mg0-B2O3:0.11Ce, 0.
The emission spectrum of the 06Tb phosphor shows that all the phosphors contained in the cerium- and terbium-activated divalent metal borate-based phosphor used in the present invention have a peak wavelength near 540r1m, as illustrated in Figure 1. , and the half-value width of its emission spectrum is also sufficiently narrow.
As mentioned above, the cerium- and terbium-activated divalent metal borate-based phosphor used in the present invention exhibits green light emission with a narrow half-value width having a peak wavelength around 540r1m. :Tb phosphor, Y2Sjq:Ce,Tb phosphor, (Ce,Tb)Mg
AellOl9 phosphor, (Ce,Tb)ZnAellO
It generally emits light with higher brightness than l9 phosphors, etc., and has less deterioration and less change in luminance over time.
In this respect, it is superior to the above-mentioned conventional phosphors as a green-emitting phosphor for the fluorescent film of a high color rendering fluorescent lamp.

Table 1 below shows one type of cerium- and terbium-activated divalent metal borate phosphor used in the present invention.
The luminance of the Mg0.B2O3:0.11Ce,0.1'7Tb phosphor under 253.7 nm ultraviolet excitation was compared to that of the conventional Y2SlO5:'11) phosphor, Y2SiO5:C
The figure shows a comparison of the emission brightness of e,Tb phosphor, (Ce,Tb)MgAellOl9 phosphor, and (Ce,TO)ZrlAellOl9 phosphor under the same excitation.

As is clear from Table 1, 0.33Mg0・B2O3
:0.11Ce, 0.1'7Tb phosphor emits light with higher brightness than conventionally known green-emitting phosphors for high color rendering fluorescent lamps.

Naturally, the intensity of the peak wavelength near 540 nm of the cerium- and terbium-activated divalent metal borate-based phosphor used in the present invention changes as the MI, MH, x value, y value, and z value change. It has been confirmed that the phosphors contained in the cerium- and terbium-activated divalent metal borate-based phosphors used in fluorescent lamps generally exhibit a higher level of luminance than the conventionally known green-emitting phosphors for high color rendering fluorescent lamps. . Second
The figure shows 0.33Mg0-, a type of cerium- and terbium-activated divalent metal borate phosphor used in the present invention.
B2O3: 0.11Ce, 0.1'71'b phosphor 2
The time-dependent change in luminescence brightness (curve a) when continuously excited with 53.7 nm ultraviolet rays is compared to conventional (Ce,TO)ZnA'11.
019 phosphor, (Ce,Tb)MgAellOl9 phosphor, and Y2SiO,:Ce,Tb phosphor, respectively.

The luminance on the vertical axis is 100% of the luminance at the start of excitation.
It is expressed as a relative value. As is clear from FIG. 2, 0.3?4g0-B2O3:0.11Ce, 0.
1B phosphor is a conventionally known green-emitting fluorescent lamp with high color rendering properties. Compared to photophosphors, there is less change (decrease) in luminance over time and less deterioration. Note that the curve a is 0.3
3N/1g0-B2O3: 0.11Ce, 0.1b The deterioration curve for the phosphor shows other phosphors included in the cerium- and terbium-activated divalent metal borate-based phosphor used in the present invention. At the same time as shown in FIG. 2, it was confirmed that the green light-emitting phosphor for fluorescent lamps with high color rendering properties was less degraded than the conventionally known green-emitting phosphor for fluorescent lamps with high color rendering properties. As described above, the cerium- and terbium-activated divalent metal borate-based phosphor used as the green-emitting phosphor of the fluorescent film of the high-color-rendering fluorescent lamp of the present invention is superior to the conventional green-emitting phosphor for high-color-rendering fluorescent lamps. Since the high color rendering fluorescent lamp of the present invention has less deterioration, the color rendering index and emission brightness change (decrease) over time less than the above-mentioned conventional high color rendering fluorescent lamp using the green emitting phosphor. It can be said that it is a thing. The luminescent composition used as the fluorescent film of the high color rendering fluorescent lamp of the present invention is a green-emitting composition that is one or more of the phosphors contained in the cerium- and terbium-activated divalent metal borate-based phosphor described above. It is prepared by mixing appropriate amounts of phosphor and blue and red emitting phosphors. As the blue and red light-emitting phosphors, those that have been proposed as blue and red light-emitting materials for high color rendering fluorescent lamps are used. That is, as a blue-emitting phosphor, a phosphor contained in a divalent europium-activated divalent metal aluminate phosphor whose composition formula is represented by (where M and b have the same definitions as above), a composition formula: (However, M■, M■, p and r
The compositional formula of the phosphor contained in the divalent europium-activated calcium chloroborate phosphor is represented by (where M, c, and d have the same definitions as above). The phosphor contained in the divalent europium-activated alkaline earth metal borophosphate phosphor is a divalent europium-activated phosphor whose composition formula is (where M, e, and f have the same definitions as above). The phosphor contained in the active alkaline earth metal halophosphate phosphor is a divalent europium-activated alkaline earth metal silicate phosphor whose composition formula is represented by (where M has the same definition as above) The phosphor contained in the body, the composition formula (however, M■
has the same definition as above) The phosphor contained in the divalent europium-activated alkaline earth metal silicate phosphor and the composition formula are represented by (where s has the same definition as above) One or more phosphors selected from the blue-emitting phosphor group consisting of phosphors included in divalent europium-activated strontium chlorosilicate phosphors are used.

In addition, as a red-emitting phosphor, the composition formula of the phosphor contained in the europium-activated rare earth oxide phosphor is represented by the composition formula (however, Ln has the same definition as above). selected from the red-emitting phosphor group consisting of the phosphor contained in the europium-activated rare earth oxysulfide-based phosphor represented by One or more types of phosphors are used.

The recording colors, blue and red emitting phosphors are mixed in an amount of 20 to 4% by weight, 3 to 4% by weight and 10 to 70% by weight of the total amount of the green, blue and red emitting phosphors, respectively. . If the mixed amounts of the green, blue and red emitting phosphors are not within the above range, a high color rendering index and high luminance cannot be obtained. By appropriately selecting the mixed amounts of green, blue and red emitting phosphors within the above range, a desired fluorescent lamp having a color temperature within the range of approximately 4000 to 6500K can be obtained. In addition, in the luminescent composition used for the fluorescent film of a high color rendering fluorescent lamp, in addition to the green, blue, and red luminescent phosphors, additives such as white luminescent phosphors and white pigments are mixed as necessary. However, in the present invention, a white emitting phosphor, additives, etc. are further added in necessary amounts to the luminescent composition obtained by mixing the recording color, blue and red emitting phosphors in the above ratio. You may. Furthermore, the green light-emitting phosphor of the light-emitting composition may be constituted by mixing a cerium- and terbium-activated divalent metal borate-based phosphor with a conventionally known green light-emitting material for high color rendering fluorescent lamps. . The high color rendering fluorescent lamp of the present invention is manufactured in the same manner as conventional high color rendering fluorescent lamps, except that the novel luminescent composition described above is used as a fluorescent film.

Next, the present invention will be explained with reference to Examples.

Example 1. 0.86Mg0-B2O3: 0.11Ce, 0.06T
1) 60% by weight of phosphor, (Ca, 2 ELl, B5O9
Cf phosphor 2 molecular weight% and (Y,EU)203 phosphor 2
A 40W fluorescent lamp having a fluorescent film made of a mixed luminescent composition consisting of

The color rendering index of the obtained fluorescent lamp was 85. Luminous efficiency is 8
2'Mlw, and showed good color rendering properties and luminance.
The emission spectrum of this fluorescent lamp is shown in FIG. Example 2. 0.33Mg0-B2O3: 0.11Ce, 0.1'7
A 40W fluorescent film using a mixed luminescent composition consisting of 50% by weight of Tb phosphor, 15% by weight of (Mg, Ef2. Fluorescent lamps were manufactured using conventional methods.

The color rendering index of the obtained fluorescent lamp was 82, and the luminous efficiency was 8.
2<em>IW and exhibited good color rendering and luminance.
Example 3. 0.71Be0-B2O3: 0.11Ce, 0.1b
Phosphor 50% by weight, 3Sr3(PO4)2・SrCe2
:Eu2+phosphor 20% by weight and (Y,Eu)■04
A 40 W fluorescent lamp having a phosphor film made of a mixed light-emitting composition containing 3% by weight of phosphor was manufactured by a conventional method.

The color rendering index of the obtained fluorescent lamp was 84, and the luminous efficiency was 8.
1'Mlw, and showed good color rendering properties and luminance.
Example 4. 0. Wa NO-B2O3: 0.06Ce, 0.01b phosphor 4%, 2 (Sr, Eu 2 O-0.84P205
・0.16B203 phosphor 20% by weight and (Y, Eu
) A 40 W fluorescent lamp whose fluorescent film was a mixed luminescent composition containing 40% by weight of VO4 phosphor was manufactured by a conventional method.

The color rendering index of the obtained fluorescent lamp was 81, and the luminous efficiency was 8.
0e·Mlw, and showed good color rendering properties and luminance. Example 5. 0.29(MgO.7yZnO.3)0・Formula 03:0.
11Ce, 0.06Tb phosphor 5 weight%, (Sr, Eu
2+)3MgSi208 phosphor 1 amount% and (Y,E
U) A 40W fluorescent lamp having a fluorescent film made of a mixed luminescent composition consisting of 4% of 202S phosphor was manufactured by a conventional method.

The color rendering index of the obtained fluorescent lamp was 80, and the luminous efficiency was 8.
1 fmIW, and showed good color rendering properties and luminance.
Example 6.0.64Mg0-B2O3:0.06Ce,
0.29T0 phosphor 50% by weight (Sr, 2 Eu, .8
Be1.2si308ce4 phosphor 20% by weight and (
A 400 W fluorescent lamp having a phosphor film made of a mixed luminescent composition consisting of 3% by weight of Y, EU) 203 phosphor was manufactured by a conventional method.

The color rendering index of the obtained fluorescent lamp was 81, and the luminous efficiency was 8.
0 mIw, showing good color rendering properties and luminance.

[Brief explanation of the drawing]

No.! The figure is a graph illustrating the emission spectrum of the green-emitting phosphor used in the fluorescent film of the high color rendering fluorescent lamp of the present invention.

Claims (1)

[Claims] 1 I The compositional formula is a(M I _1_-_x, MII_x)O・B_2O_3
:yCe, zTb (where M I is at least one of magnesium, beryllium, zinc and cadmium,
MVIII is at least one of calcium, strontium and barium, and a, x, y and z are respectively 0<a≦2.0, 0≦x≦0.25, 0<y≦0
．． 4 and 0.0001≦z≦0.4) is a green color that is one or more types of phosphors contained in cerium- and terbium-activated divalent metal borate-based phosphors. 20 to 70% by weight of light-emitting phosphor;
II The compositional formula is (MIII, Eu^2^+)O・bAl_2O_3 (where MIII is at least one of beryllium, magnesium, calcium, strontium, barium, zinc, and cadmium, and b is 2≦b≦10) divalent eurobium activation 2 expressed as (a number that satisfies the conditions)
The compositional formula of the phosphor contained in the valent metal aluminate-based phosphor is (Ca, Eu^2^+)\_2-_p\MIV_p(
B_1_-_r+MV_r)_5O__9C(However, MI
V is at least one of beryllium, magnesium, zinc, tin and lead, MV is aluminum, gallium,
At least one of indium, thallium and bismuth, with divalent europium represented by p and r being numbers satisfying the conditions of 0≦p≦0.7 and 0≦r≦0.3, respectively. The compositional formula of the phosphor contained in the active calcium chloroborate phosphor is c(MII, Eu^
2^+)O・(1-d)P_2O_5・dB_2O_3
(However, MII has the same definition as above, and c and d are 1.75≦c≦2.30 and 0, respectively.
．． The compositional formula of the phosphor contained in the divalent europium-activated alkaline earth metal borophosphate phosphor is eMII_3 (a number that satisfies the condition 05≦d≦0.23).
PO_4)_2・fMIICl_2: Eu^2^+ (However, MII has the same definition as above, and e and f are 1≦e/f
≦3) The composition formula of the phosphor contained in the divalent europium-activated alkaline earth metal halophosphate phosphor is (MII,
Eu^2^+)_3MgSi_2O_8(MII, Eu^
The compositional formula of the phosphor contained in the divalent europium-activated alkaline earth metal silicate phosphor represented by 2^+)_3MgSi_2O_8 (MII has the same definition as above) is (MII, Eu^2^ +)_2MgSi_2O_7
(However, MII has the same definition as above) 2
The phosphor and compositional formula contained in the valent europium-activated alkaline earth metal silicate phosphor are (Sr, Eu^2^+
)_4_-_sBe_sSi_3_8Cl_4 (However, s
is a number satisfying the condition 0≦s≦1.5) One of the phosphors selected from the blue-emitting phosphor group consisting of phosphors contained in divalent europium-activated strontium chlorosilicate phosphors 3 to 40% by weight of a blue-emitting phosphor which is a species or two or more species; and III whose compositional formula is (Ln,Eu)_2O_3 (wherein Ln is at least one of yttrium, gadolinium, lutetium and lanthanum); The phosphor contained in the europium-activated rare earth oxide-based phosphor is represented by the composition formula (Ln,Eu)_2O_2S (Ln has the same definition as above). 10 to 70% by weight of a red-emitting phosphor that is one or more types of phosphor selected from the red-emitting phosphor group consisting of the included phosphor and the europium-activated yttrium vanadate phosphor [(Y,Eu)VO_4] A fluorescent lamp with high color rendering properties, characterized in that a fluorescent film is made of a mixed luminescent composition consisting of