JPS599592B2 - mixed phosphor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixed phosphor formulated to emit white light.

A conventional white phosphor screen is constructed by mixing a ZnS-based phosphor that emits blue color and a phosphor that emits yellow color to exhibit high-intensity white color.

On the other hand, fly-ix spot tubes require a phosphor with a short decay time, so it is difficult to obtain high-brightness light. Y3Al501
Even a phosphor mixed with 2:Ce has a luminance of about 10% of that of a ZnS-based white phosphor, making it unsuitable for use as a white screen for a fly-ick spot tube.

In recent years, there have been many cases in which the phosphors of flyik spot tubes are made to have red, green, and blue emission spectra and are used as color flyik spot tubes.

For example, the above Y2SiO5:Ce and Y3Al5O32:C
Mixed phosphors with e are used as color flying spot tubes containing three colors. Moreover, if it is desired to reinforce the green part, Y3(AlGa)5O, 2:Ce may be added. On the other hand, ZnO:Zn is suitable for securing three color emission bands with one type of phosphor, although the brightness is slightly lowered. 5. An object of the present invention is to provide a phosphor that allows a single picture tube to serve as a display tube and a fly-ix spot tube, for example.

The mixed phosphor of the present invention uses a high-intensity phosphor such as a ZnS-based white phosphor for the monitor, and a phosphor with a short emission decay time to obtain a fly ink spot signal. They are mixed together to form a phosphor screen so that fly ink spot signals can be obtained at the same time as the screen monitor, and if desired, fly ink spot signals in three colors of red, green, and blue can be obtained. In the case of recent color television receivers, in addition to the original picture tube, a smaller black and white picture tube has been added so that the contents of channels other than the channel being viewed can be monitored. There is.

If this monitor picture tube is used as a fly ink spot scanner, for example, the three colors of red, green, and blue from a color positive film are taken out as fly ink spot signals and projected onto the main color picture tube, a color television. The receiver will also serve as a slide projector. For this purpose, the phosphor screen of the monitor picture tube must contain a phosphor that emits light in each of the red, green, and blue spectral regions and has a short decay time. However, as mentioned above, phosphors with a short decay time that allow a fly ink spot signal to be obtained generally have low luminance, making them unsuitable for general monitor tubes. Therefore, ZnS with high brightness is suitable for monitors:
While securing the function as a monitor tube by using Ag or (ZnCd)S:Ag phosphor, for example, Y3AI,O for the red color is used for the fly ink spot signal.
l2: Y for Cel green, (AIGa) 5012:
Y2SiO, :Ce or Y2S for Cel blue color
i2O7:Ce or (CaMg)SiO3:Ce
It can also function as a fly ink spot scanner by mixing a phosphor with a short emission decay time, such as .

The above 5ZnS:Ag or (ZnCd)S:Ag is
It has a longer decay time and higher luminance than phosphors that have emission spectra in the red, green, and blue regions. As a result, when used as a color fly ink spot tube, for example, ZnS:Agq or (ZnC
d) The S:Ag phosphor does not impair its function as a fly ink spot scanner, and on the other hand, when used as a monitor for a monochrome picture tube, a monochrome image with high brightness can be obtained. In this case, the mixing ratio of the fly ink spot signal phosphors must be determined by considering the sensitivity of the detector that detects the fly ink spot signal or the luminous efficiency of the short afterglow red, green, and blue color phosphors. The emitted light color does not necessarily exhibit a good white color. However, since the monitor phosphor to be mixed with this has high brightness and the emission color can be obtained fairly freely, it is easy to formulate the phosphor so as to give a good white color as a whole. By constructing the phosphor screen of the picture tube using a phosphor formulated in this way, sufficient brightness is ensured for monitor use, and at the same time, it also satisfies its role when used as a fly ink spot tube. becomes possible. Examples of the mixed phosphor of the present invention will be shown below.

Example 1 If a fly ink spot signal is detected with a photomultiplier tube having spectral sensitivity characteristics of S-4 for the blue region and S-1 for the red-green region, in order to compensate for the decrease in relative sensitivity in the red-green region, Y2Sl as a phosphor for blue fly ink spot signal
O5:Ce and Y3Al5O,2:Ce as a phosphor for red-green fly ink spot signals are mixed at a weight ratio of 1:2.

A mixed phosphor mixed in such a ratio exhibits an orange-tinted luminescent color. In order to compensate for this orange-colored emitted light color and obtain bright white light as a whole, the emitted light peak wavelength is 4.
40nm blue emitting phosphor ZnS:Ag and peak wavelength 5
68 nm orange light emitter ZnCdS:Ag in a weight ratio of 5:4
Add the mixture. Good white light emission was obtained by adding and mixing 1 part of the weight of the ZnS-based mixed phosphor to 1 part of the weight of the mixed phosphor for fly ink spot signals. Example 2 The same photomultiplier tube as in Example 1 is used for fly ink spot signal detection.

In order to emphasize the green part of the fly ink spot signal, red phosphor, Y3Al, Ol2:Ce green phosphor, Y
3Al2Ga3O, 2:Ce blue phosphor, Y2SlO
, :Ce are mixed at a weight ratio of 2:1:2. Such a mixed fly ink spot signal phosphor emits white light with a slight green tinge. In order to offset this green color, red phosphors Y, O3:EU1, blue-emitting phosphors ZnS:Agl with an emission peak wavelength of 440 nm, and orange-emitting phosphors ZnCdS:Agl with an emission peak wavelength of 568 nm were used in a ratio of 1:5:4, respectively. Prepare a mixture. When the fly ink spot mixed phosphor and the latter red, blue, and yellow mixed phosphor were mixed at a weight ratio of 1:1, overall good white light emission was obtained. Example 3 An example will be described in which ZnO:Zn, which is a type of phosphor and has red, green, and blue light emitting regions, is used as a phosphor for fly ink spot signals.

Since the above-mentioned phosphor has an emission peak in the blue to green region, it exhibits a whitish bluish-green color. To compensate for this, the emission peak 4
A 40 nm blue light emitting phosphor ZnS:Ag and a red light emitting phosphor Y2O3:EU were mixed at a weight ratio of 3:1, and the ZnO:Zn and the mixed phosphor described later were mixed at a weight ratio of 1.2
When mixed at a weight ratio of ~1.3:1, a mixed phosphor exhibiting good white color was obtained. As explained above, according to the mixed phosphor of the present invention, a combination of red, green, and blue can be freely selected as a fly ink spot signal phosphor without worrying about the emitted color, and as a result, it is easy to see. can be easily adjusted so that the user perceives white light emission, and the brightness can be increased, so it is possible to realize a device that has both a display tube and a fly ink spot tube, for example.

Claims (1)

[Claims] 1 Y_3Al_5O_1_2: Ce and Y_3Al_2
A first phosphor made of a mixture of Ga_3O_1_2:Ce and Y_2SiO_5:Ce, and Y_2O_3 whose emission decay time is longer and whose emission brightness is higher than that of the first phosphor.
A mixed phosphor characterized in that it is prepared by mixing Eu, ZnS:Ag, and a second phosphor containing (ZnCd)S:Ag at a weight ratio of 1:1 to emit white light. 2 Y_2SiO_5:Ce and Y_3Al_5O_1_
2: A first phosphor formed by mixing Ce, and a mixture of ZnS:Ag and (ZnCd)S:Ag, which have a longer emission decay time and higher emission brightness than the first phosphor. What is claimed is: 1. A mixed phosphor, characterized in that it is blended with a second phosphor in a weight ratio of 1:1 to emit white light. 3. A first phosphor made of ZnO:Zn, and a second phosphor made of a mixture of ZnS:Ag and Y_2O_3:Eu, which have a longer emission decay time and higher emission brightness than the first phosphor. What is claimed is: 1. A mixed phosphor, characterized in that it is prepared by mixing the following at a weight ratio of 1.2 to 1.3:1 so as to emit white light. 4 A phosphor that is a mixture of one or more types of phosphors that have emission spectra in the red, green, and blue regions and a short emission decay time is added to a phosphor that has a longer emission decay time than the above phosphors and that has a shorter emission decay time. A mixed phosphor characterized in that it is prepared by mixing high-luminance ZnS-based or (ZnCd)S-based phosphors so as to emit white light as a whole.