JPS6014061B2 - Manufacturing method of phosphor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a crab phosphor using cerium-activated lanthanium thiogallate as a matrix, and aims to obtain a crab phosphor with high brightness.

The crab light body according to the present invention is an afterglow crab light body that emits green light when excited by electron beams and ultraviolet light, and is particularly suitable for application to flying spot tubes and index tubes. Anne-Marie, Roy.

-・Paper by Rodetsch et al. (Mat.Res.B Blood.Vo
l. 12, pp. 1-Iso 6, 1977), La
There are two compounds in the Ga2S3 system.60a. /bu,4 and LaGaS3 exist, the former being hexagonal (lattice constants a=10.15A, c=6.08A) and the latter having an unknown structure. Although there are no reports on crab photons made of these compounds activated with ions forming luminescent centers, the present inventors have previously discovered that LaGaS3 can be a good host for cerium luminescence. The present invention was made for the purpose of further improving the luminous efficiency of the above-mentioned crab light body, that is, cerium-activated lanthanium thiogallate, and contains sodium chloride, sodium chloride, It has been found that by adding at least one of the potassium chlorides and firing the mixture, a significant improvement in light world power was found.

Hereinafter, the method for producing a crab photoreceptor according to the present invention will be described in detail according to Examples.・Example 1 0.485 mol of lanthanum sulfide (Ga2S3), 0.5 mol of potassium sulfide (Ga2S3), cerium carbonate (Ce2(
C03)3) Add 0, 0.5, 2, 4, and 6% by weight (based on the above mixture) of sodium chloride (NaCI) to a 0.015 mol mixture, mix well, and mix these 5 types at 850% by weight. It was fired for 4 hours at noon in a quartz boat in a specific S atmosphere.

These crab light bodies are excited with a 10KV electron beam, and the light output is connected to a silicon PIN diode (Matsushita Electronics PN303).
Figure 1 shows the results detected.

As shown in the figure, the optical power increases with the amount of NaCI added, and when 2% by weight is added, the optical output is more than twice that of the case without the addition. When the amount added exceeds 2% by weight, the light output decreases again, and when 4% by weight is added, the light output is almost the same as that without the addition. FIG. 2 shows the emission spectrum of the crab photogen thus obtained. NaCI
Sample ■ with no additives exhibits luminescence with a single peak at 504n, but as the amount of NaCI added increases, the luminescence around 53cm becomes stronger (Sample ■Sample ■), and the peak at 504n shifts to the shorter wavelength side. Indicates the tendency to move. As shown in the figure, when 2% by weight was added (sample
The figure shows an emission spectrum with two peaks. A part of the powder X-ray diffraction pattern is shown in FIG. Figure 3a shows the X-ray diffraction pattern of an additive-free sample, which is presumed to be the same phase as the phase of unknown structure (GaS3) described in the above-mentioned ring text by Anne-Marie and Rochlo-Rozatsch. (
Hereinafter, this will be referred to as phase A).

As the amount of NaCI added increases, the above-mentioned phase A decreases, and in contrast, the hexagonal phase shown in FIG.

Hexagonal L is also Ga. It has been confirmed from another experiment that Ce3◆ in o'3S24 does not emit light, so
The change in the emission spectrum shown in FIG. 2 is presumed to be due to a decrease in the A phase and an increase in the U phase.

Example 2 30.435 mol of La2S, 30.55 mol of G
N to a mixture of 30.015 moles of
Add 0, 0.51, 2, 2.5, 3, and 4% by weight (based on the above mixture) of aCI, respectively, and mix well.
The seed mixture was calcined at 850° C. for 10 hours in a quartz boat in an H oven.

Figure 4 shows the light world power from these crab light bodies, and NaC
When 12.5% by weight is added, it is about 65% lower than when no additive is added.
% light output increased. Example 3 In Example 1, potassium chloride (K
CI) was used, and the amount added was 2% by weight.

The light output of the obtained light body was 3.1 in the same unit as the axis of FIG. 1. In other words, it is about 50% lower than the case without additives.
% light world power increased. Example 4 In Example 1, NaCI and KCI were added in an amount of 1% by weight each.

The light world power of the obtained crab light body is about 80% higher than that without additives.
% increased.

[Brief explanation of the drawing]

Figures 1 and 4 are diagrams showing the effect of the amount of NaCI added on the luminescence output in the method of the present invention, Figure 2 is a diagram showing the generated spectrum by the method of the present invention, and Figures 3 a to d are diagrams showing the same-spectrum light. FIG. 2 is a diagram showing a powder X-ray pattern of a body. Figure 2 Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] 1. A method for producing a phosphor, which comprises adding at least one of sodium chloride and potassium chloride to a raw material for a phosphor containing cerium-activated lanthanum thiogallate as a main component, and then firing.