High-luminosity stress-luminescent material

Details High-luminosity stress-luminescent material High-luminosity stress-luminescent material

1999-12-22

2001-08-28

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

C501S120000, C501S125000, C423S600000

Reexamination Certificate

active

06280655

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a novel stress-luminescent material of high luminosity which is a material capable of emitting intensive luminescence when stressed by receiving a mechanical force as well as a method for the preparation of such a stress-luminescent material and a method for obtaining luminescence by using the stress-luminescent material.
It is well known in the prior art that certain materials called a phosphor exhibit luminescence which is a phenomenon to emit visible light at or in the vicinity of room temperature when the material receives stimulation from outside. Phosphor materials capable of emitting luminescence are widely employed in lighting devices such as fluorescent lamps and displays such as cathode ray tubes (CRT).
The stimulation from outside to cause the phenomenon of luminescence is given conventionally by ultraviolet light, electron beams, X-rays, ionizing radiations, electric fields, chemical reactions and so on. There are found, however, very few reports that certain materials can emit luminescence when stressed by receiving stimulation from outside such as a mechanical force. Such a material is referred to as a stress-luminescent material hereinafter.
SUMMARY OF THE INVENTION
The present invention accordingly has an object to provide a novel stress-luminescent material capable of efficiently emitting luminescence when stressed by receiving a mechanical stimulation such as rubbing, shearing, impact, compression, tension and the like even in the absence of any conventional stimulations such as ultraviolet light, electron beams, X-rays, ionizing radiations, electric fields, chemical reactions and so on. Thus, the novel stress-luminescent material of high intensity provided by the present invention is basically an aluminate compound which is a composite oxide consisting of aluminum oxide and an alkaline earth metal oxide having a non-stoichiometric composition with deficiency relative to the alkaline earth metal ions as represented by the composition formula of
M
x
Al
2
O
3+x
, M
x
QAl
10
O
16+x
, M
x1
Q
x2
Al
2
O
3+x1+x 2
or
M
x1
Q
x2
LAl
10
O
16+x1+x 2
,
in which M, Q and L are each an alkaline earth metal element selected from the group consisting of magnesium, calcium, strontium and barium, x is a positive number larger than 0.8 but smaller than 1.0 and x1and x2 are each 0 or a positive number with the proviso that (x1+x2) is larger than 0.8 but smaller than 1.0.


REFERENCES:
patent: 3294699 (1966-12-01), Lange
patent: 4584151 (1986-04-01), Matsui et al.
patent: 5686022 (1997-11-01), Murayama et al.

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