JPS5918821B2 - fluorescent light emitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a phosphor light emitting device that emits light using a slow electron beam.

Conventionally, most light-emitting devices using discharge have been devices that emit light by making a phosphor emit light using ultraviolet rays during discharge, by using the color of the discharge itself, or by using a combination of both.

Recently, a device has been announced that uses ZnO phosphor and makes the phosphor emit light using a low-velocity electron beam generated by discharge (Pr.
oceedings of the IEEE, 19
July 1971 issue (Vo159) page 1130).

However, since this device requires two types of power: power for discharging and power for emitting light from the phosphor, it has drawbacks such as poor light emitting efficiency and low luminance.

Afterwards, a few devices using this low-speed electron beam were announced, but (Proceedings of the IE
E.E.

1973 Vol. 61, July issue, p. 1025, Institute of Electronics and Communication Engineers Materials, 1974 EDD-74-58) There are still points to be improved in terms of luminous efficiency and the like.

The present invention improves these drawbacks and provides a phosphor light-emitting device that is efficient, has high brightness, and is suitable for use as a large-scale surface light emitting source.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an example of an embodiment of the phosphor light emitting device of the present invention.

A hole 2 is provided in the insulating plate 1.

On one side of the insulating plate 1, a phosphor electrode 3 is deposited, printed, or
The phosphor layer 4 is provided by pasting or the like, and then a phosphor layer 4 is provided on a portion of the phosphor electrode 3 by printing or the like so as to cover the phosphor electrode 3.

Furthermore, a front plate 6 is provided on the portion where the phosphor layer 4 is not provided with an insulating spacer 5 interposed therebetween.

At this time, the hole 7 of the front plate 6 is aligned with the phosphor 4 so that the hole 2 and the hole T do not overlap.

On the other hand, on the other side of the insulating plate 1, a back electrode 8 is provided between the phosphor electrode 3 and the phosphor electrode 3 via the phosphor 4 and the hole 2 by a distance sufficient to allow discharge to occur.

The structure thus constructed is placed in a case, brought to a vacuum state, and then helium, argon, or a mixture of both gases is introduced at a pressure of several torr - 200 torr.

In this state, a negative potential is applied to the back electrode 8, and the phosphor electrode 3
Give a positive potential to

When the potential difference between both electrodes 3 and 8 exceeds the discharge starting voltage,
A discharge occurs through the hole 2, and a negative glow is generated around the back electrode 8.

Due to the discharge generated in this way, the area around the hole 2 enters a plasma state.

The electrons in this plasma are attracted toward the phosphor electrode 3, and at this time, the phosphor 4 is excited to emit light.

At this time, the potential of the phosphor electrodes 31 other than the phosphor electrode 3 of the phosphor 4 to be emitted is lower than that of the phosphor electrode 3 (
Alternatively, if the O potential (or negative potential) is maintained, the electrons in the plasma generated near the hole 2 will not be attracted to the phosphor electrode 31 (or will be repelled), but will concentrate on the phosphor electrode 3 and fluoresce. A highly efficient light-emitting device with good contrast, high color purity, and high brightness in which only the phosphor 4 emits light without the body 41 emitting light can be obtained.

When zinc oxide is used as the phosphor, the brightness is approximately 4007-
) Lambert shows an overall efficiency of approximately 0.5 lumens/watt, a high value that cannot be obtained conventionally.

Further, FIGS. 1 and 2 of the embodiment of the present invention show a part thereof, and the two-dimensional enlargement of what is shown in FIGS. (Expanded in the longitudinal direction of the back electrode 8), it can also be used as a surface emitting source and a display device.

Further, if the holes 2 are made thin, electrons are accelerated by space charges, and higher luminance can be obtained.

In addition, in this light-emitting device, the phosphor light-emitting surface directly faces the observer, so it is not observed through a transparent electrode as in the conventional case, and the luminance does not decrease.
Therefore, it has the advantage of improving luminous efficiency.

As described above, the present invention provides a phosphor electrode at a location other than the hole on one side of an insulating plate provided with a hole, a phosphor so as to partially cover the phosphor electrode, and an insulating spacer. A front plate is provided through which only the phosphor is exposed, and on the opposite side of this insulating plate, another back electrode is placed at a slightly distant position to connect the phosphor electrode and the back electrode. A phosphor light-emitting device characterized by causing discharge through the phosphor and holes between the phosphors and the phosphor to emit light at the same time, and obtaining a wide-area panel with high brightness, high efficiency, and good contrast. It is possible to do this, and its industrial value is great.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a phosphor light emitting device according to an embodiment of the present invention, and FIG. 2 is a sectional side view of the device. 1... Insulating plate, 2... Hole, 3...
...phosphor electrode, 4...phosphor, 5...
・Insulating spacer, 6...Front plate, 8...
Back electrode.

Claims (1)

[Claims] 1. A phosphor electrode is provided at a location other than the hole on one surface of an insulating plate provided with a hole, a phosphor is provided to cover the phosphor electrode, and only the phosphor is exposed through an insulating spacer. A front plate is provided with a hole that does not overlap with the hole of the insulating plate, and on the opposite side of the insulating plate, another back electrode is arranged at a slightly distant position, and the phosphor electrode is disposed on the opposite side of the insulating plate. A phosphor light-emitting device characterized in that a discharge is caused between the phosphor and the back electrode through the hole in the phosphor and the insulating plate, and at the same time the phosphor is made to emit light.