JPS6039313B2 - fluorescent material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel crab phosphor that emits red to orange light when irradiated with electron beams, ultraviolet rays, etc.

Recently, energy saving has become an important issue in various fields. Looking at this with respect to the crab light lamp for illumination, it follows that in order to save energy, the crab light body must be highly efficient. When considering crab photoluminescence from such a viewpoint, it is necessary to pay special attention to the following two points.

In other words, the human eye's sensitivity to brightness means that green colors are perceived as brightest, and red and blue colors are perceived as dark. It varies depending on the color of the emitted light. Therefore, the first thing to do is to be satisfied with the sense of brightness as seen by human senses, that is, with respect to visibility. Second, the color of the illuminated object can be reproduced in a natural state, that is, it has good color rendering properties. However, it is generally difficult to achieve both high color rendering and high efficiency, and in order to achieve high color rendering, a large amount of red component with poor visibility is usually required.

For this reason, when used in combination with known green and blue light bodies, red to blue light that exhibits high efficiency and high color rendering properties can be used.
There was a strong demand for clear-colored crab light bodies. Therefore, as a result of conducting studies on various crab light bodies based on such an objective, the inventor finally succeeded in providing a new red to clear color light emitting crab light body.

That is, the crab photoreceptor according to the present invention has the composition formula 4A○.
BX03・C205: yEu3 where A; Sr and/or Ba B; Y and/or Gd C; Ta and/or Nb 04
It is expressed by a positive number of ≦y≦0.32, and is characterized by the fact that trivalent europium E-za-do is substituted for a part of yttrium Y and/or gadolinium Gd as an activator.

In addition, in the above compositional formula, the relationship between x and y is 1.9
5Sx+y≦2.05 and 0.04≦y≦0.32
If it deviates from this range without satisfying the condition that it is a positive number, the luminous efficiency of the crab light body will decrease to such an extent that it cannot be put to practical use.

In the above unified compositional formula, if A is Sr, then A
O is strontium oxide (Sr0), and Ba is barium oxide (Ba○).

Sr and mother may coexist to form an oxide.
If B is Y, Bx03 is yttrium oxide (Yx03
), and if it is Gd, it is gadolinium oxide (Gdx03
). Y and Gd are sometimes mixed together to form an oxide. If C is Ta, C2Q is tantalum oxide (Ta205), and if Nb is niobium oxide (
NQ05). Ta and Nb may also be mixed together to form oxides. And, the crab light body according to the present invention has the base material 4A○, which is constructed in this way.
Bx03・C2 is the middle B, i.e. Y and/or G
A part of d is replaced by Ezaju as an activator. This halo has a main emission peak around 59 m and a sub-emission peak around 611 nm, as shown in FIG. 1, under excitation by ultraviolet rays, electron beams, etc.

In other words, compared to the red saddle light Y203:E, which has been used in recent years for the same purpose, it has an emission spectrum of 10 (main peak near 61 m) in terms of visibility. It has a more favorable emission spectrum. Therefore, it has good moat color properties and is also advantageous in terms of visibility. This crab photon is made of, for example, Sr as a raw material.
C03 and/or BaC03, Y203 and/or G also03, Ta205 and/or NQ05, E
U203 was selected, and these were blended in predetermined amounts and thoroughly dry-mixed in a firing furnace in an oxidizing atmosphere, preferably in an air atmosphere, at a temperature of 1200 to 1700 oo.
It is synthesized by firing for about 2 hours. Table 1 shows the relationship between the amount of substitution where E is 1 and the luminescence intensity in each of the crab photons of the present invention included in the above general formula. Note 1 to Table 1; The amount of 8u3de substitution is expressed as the substitution ratio to the Y atom position or the Gd atom position.

Note 2; The emission intensity was measured using a fluorescence spectrophotometer.

Note 3: The synthesis state was confirmed by X-ray diffraction. In this case, ○uKo rays were used as the incident X-rays. And X-ray diffraction angle (h.k.1) = (2.2.0), (4
．． 0.0), (4.2.2), with phosphor bases 1 and 2
In the case of 26=approximately 31.50, 43.70, 54.30 K, in the case of flea light bodies No. 3 and 4, 28=approximately 29.90,
42.80, 53.00, in the case of phosphor Nos. 5 and 6, 282 approximately 30.60, 43.8, 54.40; in the case of phosphor arms 7 and 8, 26 = approximately 29.9. ,42.
They each have main diffraction peaks near 8. and 53.10. The crab photon according to the present invention can be used alone as a red-emitting crab photon, or can also be used in combination with other crab photons.

Next, an embodiment will be described together with a conventional example.

A crab light lamp was manufactured using the red honey luminous material according to the present invention, and its light emitting characteristics were compared with those of a conventional crab light lamp.

The crab light substance used in the examples is a mixture of the following three components.
'1' In the case of Example 1, the amount of growth Sr.

(P04) 6CI2: Eu2 ingredients (Ce, Tb
) MgA1,. ○, 9 red component book・Y203・Ta
2Q: Eu30'2' In the case of Example 2, the amount of growth Sr,
.

(P04) 6CI2: Eu2 ingredients (Ce, Tb
) MgA1,. 0.9 Red component Rainbow 0.Y2Q.T also Q.Eu30 A mixture of the above crab photons was dispersed in butyl acetate thickened with nitrocellulose and applied to a crab light lamp bulb. In this case, a binder such as calcium pyrophosphate may be added to increase the binding effect. The mixing ratio of each crab light body was expressed as the emission spectrum intensity ratio of each crab light body, and was set as shown in Table 2. Here, the emission spectrum intensity ratio is defined as the spectral intensity of each crab when the same amount of UV as that applied to the mixed composition is applied to each crab light substance alone. represents the ratio of the respective crab light spectrum intensities of the mixed composition. The conventional examples in Table 2 were also coated on bulbs for crab light lamps in the same manner.

In addition, in Conventional Example 1, calcium halophosphate was used as the crab photoreceptor:
M20 and Sb30 were selected, and in Conventional Example 2, the following three-component mixed system was selected as the phosphor. Sr.

(P04)6CI2:Eu20(Ce,Th)MgA1
、． ○, 9 Y203: Eu30 or more, 40W, 32hm, Ar enclosed, 2
．． A 5Tom crab light lamp was manufactured and its light emitting characteristics were investigated.

The results are shown in Table 3. The crab light lamp is 4200K, white (chromaticity point x 0.37, y=0.
38) was examined. Table 3

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram showing the spectral energy distribution of the crab photoreceptor according to the present invention, and FIGS. 2 to 9 show Eu
30 is a diagram showing the relationship between the amount of substitution and the luminescence intensity. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1 Composition formula 4AO・B_xO_3・C_2O_5:_yEu^3^
+wherein A; Sr and/or BaB; Y and/
or Gd C; Ta and/or Nb x,y; 1.95≦x+y≦2.05, and 0.04
It is expressed as a positive number of ≦y≦0.32, and trivalent europium Eu^3^+ is used as an activator for yttrium Y and /
Or a phosphor characterized in that gadolinium Gd is partially substituted.