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Fluorescent substance and process for producing the same, and particle dispersion-type el device using the same

A technology of phosphors and particles, applied in electroluminescent light sources, chemical instruments and methods, nanotechnology for information processing, etc., can solve problems such as non-luminescence

Inactive Publication Date: 2007-05-30
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, as described in Non-Patent Document 2, in a particle-dispersed EL device in which copper powder or another conductive powder is mixed with a dispersion layer, high-intensity light cannot be expected because there is no conductive material inside the phosphor. Floor
In addition, oxynitride phosphors cannot be used in practical applications as particle-dispersed EL devices because they do not emit light when excited by an electric field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Carbon Nanotube Dispersion

[0083] 0.0123 g of carbon nanotubes (CNTs) having various aspect ratios were dispersed in water at a concentration of 0.001 wt % to prepare 1230 ml of a liquid.

[0084] Preparation of ZnS-CNT Composite Powder

[0085] (1) Raw materials

[0086] ZnSO 4 Powder, average particle size: 0.5μm

[0087] Na 2 S powder, average particle size: 0.5μm

[0088] (2) Hydrothermal treatment

[0089] ZnSO 4 Powder and Na 2 S powder was added to the CNT dispersion such that Zn:S=1:1 (molar ratio). The amount added was adjusted to obtain 100 g of ZnS. The mixture was charged into an autoclave and treated at a temperature of 500° C. and a pressure of 2 MPa for 5 hours. The powder obtained by this treatment was collected and dried to obtain a ZnS-CNT composite powder.

[0090] Phosphor preparation

[0091] (1) Raw material

[0092] ZnS-CNT composite powder: 20g

[0093] Activator raw material (Ag source): Ag with an average particle size of 0.1 μm...

Embodiment 2

[0113] carbon nanohorn dispersion

[0114] 0.0123 g of carbon nanohorn (CNH) was dispersed in water at a concentration of 0.001 wt % to prepare 1230 ml of liquid.

[0115] Preparation of ZnS-CNH mixed powder

[0116] (1) Raw material

[0117] ZnSO 4 Powder; average particle size: 0.5μm

[0118] Na 2 S powder; average particle size: 0.5μm

[0119] (2) Hydrothermal treatment

[0120] ZnSO 4 Powder and Na 2 S powder was added to the CNH dispersion such that Zn:S=1:1 (molar ratio). The amount added was adjusted to yield 100 g of ZnS. The mixture was charged into an autoclave and treated at a temperature of 500° C. and a pressure of 2 MPa for 5 hours. The powder obtained by this treatment is recovered and then dried to obtain a phosphor precursor.

[0121] Phosphor preparation

[0122] (1) Raw material

[0123] Phosphor precursor: 20g

[0124] Mixed crystal matrix: MgS powder, CaS powder and SrS powder, the average particle size of each powder is 0.1 μm.

[0125] Act...

Embodiment 3

[0145] In addition to using Cu with an average particle size of 0.1 μm 2 S instead of Ag 2 Except S, in the same manner as in Example 1, phosphors were prepared from the raw materials with the compositions shown in Table 3-1. The results are shown in Table 3-2.

[0146] Light was also emitted by the EL device in which the CNT-free phosphor was used when Cu was used as the activator dopant. However, by adding CNTs, the intensity of light was increased (No. 18 to 20).

[0147] [Table 3-1]

[0148] Numbering

[0149] No. 18: Comparative example

[0150] [Table 3-2]

[0151] make up

[0152] No. 18: Comparative example

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Abstract

A fluorescent substance for EL, which internally contains an electrically conductive phase containing a carbon component such as a carbon nanotube or a carbon nanohorn, is provided. The fluorescent substance internally containing an electrically conductive phase is a sulfide composed mainly of Ag- or Cu-activated ZnS, particularly a fluorescent substance of general formula Zn(1-x)AxS:Ag / Cu,D wherein A represents at least one group 2A element selected from the group consisting of Be, Mg, Ca, Sr and Ba; D represents a coactivator and is at least one element selected from the group consisting of group 3B and 7B elements; and 0 = <x < 1, or an amorphous oxynitride-based fluorescent substance of a B-N-O, Si-O-N, Al-O-N, Ga-O-N, Al-Ga-O-N, In-Ga-O-N, or In-Al-O-N system activated with a rare earth ion such as Eu2+, Gd3+, or Yb2+. A surface luminous body prepared by the above fluorescent body can provide a particle dispersion-type EL device which emits high-luminescence intensity ultraviolet light or visible light close thereto by electric field excitation through the internal incorporation of the electrically conductive phase.

Description

technical field [0001] The present application relates to a dispersed EL (electroluminescence) phosphor (phosphor), in particular to a dispersed EL phosphor emitting light in the range of visible light or UV light with high intensity and high efficiency, and to a method for preparing the phosphor, And a particle-dispersed EL device in which the phosphor is used as a surface emitter. Background technique [0002] In view of recent environmental problems, functions related to separation, decomposition, or elimination of toxic substances, bacteria, viruses, etc. are urgently required. Attention has been paid to photocatalytic substances as a means for carrying out such decomposition and disinfection. Anatase TiO 2 As a typical example of photocatalyst, it usually has a photocatalytic effect under UV light with a wavelength of 400nm or shorter. Recently also developed rutile TiO 2 , which works at about 420nm, but relatively anatase TiO 2 Has a lower level of functionality....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/63C09K11/00C09K11/08H05B33/14
CPCB82Y10/00B82Y30/00C09K11/08C09K11/56C09K11/54H05B33/14
Inventor 河合千寻井上龙一
Owner SUMITOMO ELECTRIC IND LTD