Red fluorescence powder

A technology of red phosphor powder and solid solution, applied in the field of phosphor powder, can solve the problem that the luminous intensity is not particularly ideal, although one of the applicants submitted a patent application for "red phosphor powder" to the State Intellectual Property Office (application The number is 01138060.8, the application date is December 27, 2001, the publication number is CN1357598A, the publication date is July 10, 2002), the problems of this document, etc., achieve the effects of strong excitation absorption, high luminous intensity, and simple process

Inactive Publication Date: 2003-12-24
WENZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the commercial phosphors are developed for the 254nm and 365nm of mercury, and there are very few phosphors excited by near-ultraviolet.
Although one of the applicants submitted a patent application for "red phosphor" to the State Intellectual Property Office before this (the application number is 01138060.8, the application date is December 27, 2001, the publication number is CN1357598A, and the publication date is July 2002. 10th), the document also discloses a red phosphor, which also contains MoO 3 、Eu 2 o 3 , also contains one or more of Ca, Sr, Cd oxides, fluorides, but does not involve tungstate
Moreover, the phosphor powder disclosed in this document is not aimed at near-ultraviolet excitation with a wavelength of 370-410 nanometers, nor is it specially used for fluorescent lamps, so its luminous intensity and other effects on near-ultraviolet excitation with a wavelength of 370-410 nanometers are not special. the ideal

Method used

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  • Red fluorescence powder
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Examples

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Embodiment 1

[0023] Example 1: A red phosphor of molybdate, which is solid solution A x B y C 2-2y (MoO 4 ) 2-(y-x) / 2 : ZD, where A is Li, B is Eu, no C, no D, M is Mo, x=1.0, y=1.0, z=0, the solid solution can be expressed as LiEuMo 2 O 8 , Obtained by reacting each component in the following molar ratios at 800 degrees Celsius for 3 hours:

[0024] MoO 3 : Eu 2 O 3 : Li 2 CO 3 =1.0:0.25:0.25

[0025] During preparation, MoO 3 And Eu 2 O 3 It can be replaced by other salts that can be decomposed into these oxides, and finally converted into oxides into the composition after the reaction. Li above 2 CO 3 Corresponding organic acid salts or nitrates can also be used instead.

[0026] This embodiment is used as a red phosphor for a fluorescent lamp, and its emission spectrum is as follows: figure 1 , The excitation spectrum is as figure 2 It can be seen from the figure that the phosphor has strong excitation absorption in the near ultraviolet band of 370-410 nanometers, high luminous intensity...

Embodiment 2

[0027] Example 2: A tungstate red phosphor, which is solid solution A x B y C 2-2y (WO 4 ) 2-(y-x) / 2 : ZD, where A is Li, B is Eu, no C, D is LiF, M is W, x=0.8, y=1.0, z=0.2, the solid solution can be expressed as LiEuW 1.9 O 7.6 F 0.2 , Obtained by reacting the components in the following molar ratios at 950 degrees Celsius for 4 hours:

[0028] WO 3 : Eu 2 O 3 : Li 2 CO 3 :LiF=0.95:0.25:0.2:0.1

[0029] During preparation, WO 3 And Eu 2 O 3 It can be replaced by other salts that can be decomposed into these oxides, and finally converted into oxides into the composition after the reaction. Li above 2 CO 3 Corresponding organic acid salts or nitrates can also be used instead.

[0030] This embodiment is used as a red phosphor for a fluorescent lamp, and its emission spectrum is similar to figure 1 Similar, the excitation spectrum is like image 3 It can be seen from the figure that the phosphor has strong excitation absorption in the near ultraviolet band of 370-410 nanometers, h...

Embodiment 3

[0031] Example 3: A red phosphor of molybdotungstate, which is solid solution A x B y C 2-2y (MO 4 ) 2-(y-x) / 2: ZD, where A is Li, B is Eu, no C, M is a mixture of Mo and W, D is LiF, x=0.8, y=1.0, z=0.2, the solid solution can be expressed as LiEuMo 0.7 W 1.2 O 7.6 F 0.2 , Obtained by reacting the components in the following molar ratios at 850 degrees Celsius for 4 hours:

[0032] MoO 3 : WO 3 : Eu 2 O 3 : Li 2 CO 3 : LiF = 0.35: 0.6: 0.25: 0.2: 0.1

[0033] During preparation, MoO 3 , WO 3 And Eu 2 O 3 It can be replaced by other salts that can be decomposed into these oxides, and finally converted into oxides into the composition after the reaction. Li above 2 CO 3 The corresponding organic acid salt or nitrate can also be substituted.

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Abstract

A red fluorescent powder in the form of sosoloid has a chemical formula: AxByC2-2y(MO4)2-(y-x)/2:2D, where A is chosen from Li, Na and K, B is chosen from Eu, Y, Gd and Lu, C is chosen from Mg, Ca and Sr, D is chosen from the fluorides of Ni, Na and K, M is Mo and/or W, x=0.1-1.0, y=0.4-1.0, and z=0-1.0. Its advantages are strong exciting absorption at near-ultraviolet band (370-410 nm), high light intensity and high color purity.

Description

Technical field [0001] The invention relates to a phosphor for fluorescent lamps, in particular to a molybdate or / and tungstate red phosphor. Background technique [0002] Most of the fluorescent lamps currently in use use mercury vapor discharge to generate ultraviolet light with a wavelength of 254 nanometers as an excitation source, and then excite phosphors to emit light. This type of light source is a gas light source. The shortcomings of this type of light source is that the bulb is large in size, especially the halogenated calcium phosphate fluorescent lamp uses toxic material mercury, and has a short life span, and the color rendering index needs to be further improved. The light source based on light-emitting diodes is an all-solid-state light source with extremely long life, no pollution, and high long-term lumen efficiency. It is called the light source of the 21st century. The light-emitting diode can currently be developed to the near-ultraviolet light with a wavelen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68
Inventor 王稼国荆西平严纯华
Owner WENZHOU UNIVERSITY
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