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Display device

A display device and phosphor technology, applied in image/graphic display tubes, discharge tubes, screen tubes, etc., can solve problems such as no luminous efficiency, and achieve the effects of improving temperature extinction, reducing damage, and reducing damage to fluorescent films.

Inactive Publication Date: 2007-06-13
HITACHI DISPLAYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(f) Even if ZnY 2 Si 2 o 8 :Tb 3+ The Zn position is replaced by Ca, or the Y position is replaced by Gd, and there is almost no luminous efficiency improvement effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0047] Prepare 9.767g of zinc oxide (ZnO) and yttrium oxide (Y 2 O 3 ) 21.000g, terbium oxide (Tb 4 O 7 ) 2.617g and silicon oxide (SiO 2 ) 12.137g. Mix it well, add a small amount of ethanol to this mixture, and use a graduated pipette in this state to add ytterbium ions (Yb 3+ ) Of aqueous solution. Adjust the ytterbium ion (Yb 3+ ) In the aqueous solution, so that the ytterbium ion (Yb 3+ ) The concentration is 10 mg / ml.

[0048] After the mixture was dried in air at about 120°C for 1 hour, it was placed in an alumina crucible and heat-treated in air at 1400°C for 2 hours. At this time, the alumina crucible is covered with a lid made of alumina (a binder for ceramics is not used). The obtained product was transferred to an agate mortar, pure water was added, and it was sieved while being lightly ground, and then dried in the air at 120°C.

[0049] The rare earth ion obtained in this way: Ytterbium ion (Yb 3+ A plurality of phosphors with different addition amounts of) are respe...

no. 2 Embodiment

[0061] Next, the second embodiment of the present invention will be described. According to the same synthesis method and conditions as the first embodiment, the phosphor base material (ZnY 2 SiO 8 ) Is added with samarium ion (Sm 3+ ) The phosphors are made into multiple test pieces. Next, the luminous intensity was measured in the same evaluation method as in the first example. Table 2 shows that no rare earth ions (Sm 3+ The relative value when the luminous intensity output of the phosphor of) is 1.

[0062] Table 2

[0063] Sm content

(μg / g)

0

(no added)

5

(Comparative example 3)

10

50

100

500

1000

3000

(Comparative Example 4)

Relative brightness

1

0.998

1.000

1.010

1.035

1.012

1.000

0.981

[0064] In addition, the reference numeral 12 in FIG. 1 indicates the additive concentration dependence of the second embodiment ...

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Abstract

The present invention can further enhance the light emission characteristics of phosphor excited by the irradiation of electron beams of high density. In a cathode ray tube including a phosphor film, a faceplate panel which constitutes a screen, an aluminum vapor-deposited film, a funnel and an electron gun, phosphor which constitutes the phosphor film applied to the faceplate panel is constituted of a terbium activated phosphor which is produced by substituting a portion of yttrium (Y) in base material crystals which contain zinc (Zn), yttrium (Y), silicon (Si) and oxygen (O) as main constitutional elements with terbium ion (Tb<3+>) and a trace amount of rare earth element ion is added to the terbium activated phosphor.

Description

Technical field [0001] The present invention relates to a display device, and more particularly to a display device in which the luminescence characteristics of phosphors excited by high-density electron beam irradiation are improved. Background technique [0002] As display devices, various display devices are known. However, since the cathode ray tubes used in projection display devices, so-called color projectors, have high brightness requirements, the phosphors that make up the screen are required to have high density. Excellent luminescence characteristics excited by electron rays. In addition, as a large-screen display device, in recent years, a field emission display (FED), which is one of flat-panel cathode ray tubes, has been developed, and the phosphor of this FED is also required to be excited by high-density electron rays. The excellent light-emitting characteristics. [0003] Phosphors excited by high-density electron rays are required to have the following character...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/20H01J31/12C09K11/79C09K11/77H01J1/63H01J31/10
CPCH01J29/20C09K11/7774C09K11/77742
Inventor 松清秀次柏仓康秀
Owner HITACHI DISPLAYS