JPS60139784A - Phosphor - Google Patents

Abstract

PURPOSE:To improve the peak height of luminescence, by dissolving yttrium oxide in a bivalent europium-activated barium aluminate phosphor. CONSTITUTION:Starting materials such as yttrium oxide, barium oxide, aluminum oxide and europium oxide or nitrates or halides of these elements are weighed. A small quantity of boric acid, etc. is added thereto and the mixture is crushed and mixed with one another in a ball mill, packed in a quartz boat and calcined at 1,100-1,600 deg.C in a reducing atmosphere for several hour to obtain the desired phosphor. The peak height of luminescence of the resulting phosphor generated by ultraviolet light excitation is 105-110% of that of conventional europium-activated barium aluminate phosphor contg. no yttrium oxide.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improvements in barium aluminate phosphors activated with divalent europium. Europium-activated thulium aluminate phosphors include C5BLASSICandum, BRIL, philips Res, Re
There is a research report in pt-t 23 (196B) 201, B & M 1,04: Ru2X- and Bam 1120
□The emission peak wavelength of HRu is
u and 435nllll.

In recent years, 480 papers have been published regarding efficiency improvement of high color rendering fluorescent lamps.
A phosphor having an emission peak at ~soonm is poured. According to recent research, for example, J, T, (3, V
AN KICMINADK and G, P, F.

HOEKS, Extended ab 5tract
No, 607°K, (3, S, Spring Meet
Bam 111O reported in ing (19ss),
3: Eu2+ phosphor is a new type of aluminate with an emission peak wavelength of 480 nm. However, the prenatal green phosphor activated with divalent europium has an insufficient emission peak height; It was desired to improve the above.Objective of the Invention The present invention was made based on the above circumstances, and an object of the present invention is to provide a divalent europium-activated aluminate phosphor with improved emission peak height. is low.

Components of the Invention The inventors conducted detailed experiments on a barium aluminate phosphor activated with divalent europium, and found that by dissolving yttrium oxide in this phosphor, the emission peak of the phosphor could be improved. It has been found that the height can be increased by one layer.

That is, according to the inventors' experiments, the barium aluminate phosphor activated with divalent europium has a compositional formula of (Ba, Eu) Orxum 1203ay ¥203. A more preferable improvement in the height of the emission peak was observed when the ranges of x and y in the above compositional formula were 3 x 5.0 < y x 0.1, respectively. Furthermore, the present invention specifies that in the case of such a phosphor, the amount of Al2O3 is 3>x or 5
〈Even in the region of : It was confirmed that the emission peak height exceeding that of the Ru phosphor could not be obtained, and that it did not reach a practical level. Further, regarding the amount of europium added as an activator, the effect of improving the luminescence peak height due to the solid solution of yttrium oxide was observed within the range of europium concentrations found in other commonly used phosphors.

Description of Examples - The phosphor according to the present invention is obtained by the manufacturing method described below. First, as raw materials for the phosphor, (1) yttrium oxide (Y2O3,) or compounds that can be easily converted to Y2O and K at high temperatures, such as nitrates, carbonates, and halides;

(2) Compounds that can be easily converted to BaO at high temperatures, such as barium oxide CB&0) or nitrates, carbonates, and halides.

(3) Aluminum oxide (Mu1203)'jtake nitrate.

Al, 0.
A compound that can change into

(4) Europium oxide (lCu2O,) or nitrate.

Compounds that can be easily converted to Eu2O3 at high temperatures, such as carbonates and halides.

is used. Weigh the above raw materials, add an appropriate amount of boric acid, boric anhydride, etc., and thoroughly pulverize and mix using a ball mill.Fill this into a quartz port and heat several times at a temperature within the range of 1100 to 1600°C in a reducing atmosphere. A phosphor is obtained by baking for a period of time.

Examples of the present invention will be described below.

Example 1 Yttrium oxide Q, 11 g Barium carbonate 1.8.74 Aluminum oxide 4.0.80 Europium oxide 0.88 Boric anhydride 0.70 The above raw materials were sufficiently pulverized and mixed in a ball mill and mixed in a reducing atmosphere. A phosphor was obtained by firing at a temperature of 1,100 to 1,600° C. for several hours.The compositional formula of the obtained phosphor is as follows.

(Hao, 1. K'uo, o, ) 064 Al,
0. @ o, oosy2o.

The height of the emission peak of this phosphor upon excitation with ultraviolet rays is higher than that of conventional phosphors (Bao, 5
Ruo, 65) Compared to the emission peak height of os 4 1203, it was 110 cm, a clear improvement was observed0 Example 2 Yttrium fluoride 0.73 g Barium carbonate 17.76 Aluminum oxide 51.00 Europium oxide 1.76 Boric acid 2-68 A phosphor was obtained in the same manner as in Example 1 using the above raw materials.

The compositional formula of the obtained phosphor is as follows.

(Bao, o ICuo4) Om 5mu 1203-
0.0025Y20゜The height of the emission peak of this phosphor upon excitation with ultraviolet rays is 0.0025Y20°.
This was 106% compared to the emission peak height of 203, and a clear improvement was observed.0 □ □ Example 3 Yttrium fluoride 2.91 g Barium carbonate 19.34 Aluminum oxide 35.70 Europium oxide 0.36 Boric acid 1.34 A phosphor was obtained in the same manner as in Example 1 using the above raw materials.

The compositional formula of the obtained phosphor is 9 below.

(Bao,,81Cuo,o2) O@3.5 A12
4), ++0.1Y20° The height of the emission peak of this phosphor due to ultraviolet excitation is 0"0.9 s"uo, o 2 ) 0 ・
3. 107 compared to the emission peak height of TSM 1203.
%, a clear improvement was observed.

In each of the above Examples, the boron-containing compound used as a flux was contained in the obtained phosphor, for example (Ba,
Eu)O@4mu120. 0.05B for 2011
Although it was observed that some amount remained, it did not significantly affect the crystal structure of the phosphor, nor did it have any particular negative effect on the luminescent properties. It can be removed to some extent through treatment.

As described in detail, the present invention provides an excellent phosphor with improved emission peak height by dissolving yttrium oxide in a divalent europium-activated barium aluminate phosphor. It is something that can be done.

Claims (1)

[Claims] A phosphor comprising a barium aluminate phosphor activated with divalent europium and a solid solution of yttrium oxide.