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Red fluorescence powder

A technology of red phosphor and solid solution, which is applied in the field of phosphor, can solve the problem that the luminous intensity is not particularly ideal. Although one of the applicants submitted a patent application for "red phosphor" to the State Intellectual Property Office (application No. 01138060.8, the application date is December 27, 2001, the publication number is CN1357598A, and the publication date is July 10, 2002), the literature and other problems achieve the effects of strong excitation absorption, high luminous intensity, and good color purity

Inactive Publication Date: 2005-05-04
WENZHOU UNIV +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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Examples

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Embodiment 1

[0023] Embodiment 1: A kind of molybdate red fluorescent powder, 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 the components in the following molar ratios at 800°C for 3 hours:

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

[0025] When prepared, 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 to enter the composition after the reaction. Li above 2 CO 3 It can also be replaced by the corresponding organic acid salt or nitrate.

[0026] This embodiment is used as the red fluorescent powder of fluorescent lamp, and its emission spectrum figure is as follows figure 1 , and its excitation spectrum is shown in figure 2 , it can be seen from the figure that the phosphor has strong excitation absorption in the near-ultraviolet ban...

Embodiment 2

[0027] Embodiment 2: A kind of tungstate red fluorescent powder 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°C for 4 hours:

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

[0029] When prepared, 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 to enter the composition after the reaction. Li above 2 CO 3 It can also be replaced by the corresponding organic acid salt or nitrate.

[0030] The present embodiment is used as the red fluorescent powder of fluorescent lamp, and its emission spectrum figure and figure 1 similarly, its excitation spectrum is shown in image 3 , it can be seen from the figure that the phosphor has strong excitation absorption in the ...

Embodiment 3

[0031] Embodiment 3: A kind of molybdenum tungstate red fluorescent powder 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°C 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] When prepared, 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 to enter the composition after the reaction. Li above 2 CO 3 It can also be replaced by the corresponding organic acid salt or nitrate.

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Abstract

The invention belongs to the field of fluorescent powder, and in particular relates to a red fluorescent powder, which is a solid solution and can be represented by a general formula: A x B y C 2-2y (MO 4 ) 2-(y-x) / 2 : zD, where A is one or more mixed use of Li, Na, K, when mixed use, cations are replaced by equivalent, the sum of the molar fractions remains unchanged; B is Eu, Y, Gd, Lu- One or more kinds of mixed use, but there must be Eu, when it is used in combination, the cation is replaced by equivalent, and the sum of its mole fractions remains unchanged; C is used in combination of one or more of Mg, Ca, Sr, when it is When used in combination, the cations are replaced by equivalents, and the sum of their molar fractions remains unchanged; D is Li, Na, and K. One or more fluorides are used in combination, and when used in combination, the sum of their molar fractions remains unchanged; M is Mo or / and W. In the above solid solution, 0.1≤x≤1.0, 0.4<y≤1.0, 0≤z≤1.0. The invention has strong excitation absorption in the near ultraviolet band of 370-410 nanometers, high luminous intensity and good color purity, and is mainly used in fluorescent lamps.

Description

technical field [0001] The invention relates to a fluorescent powder for a fluorescent lamp, in particular to a molybdate or / and tungstate red fluorescent powder. Background technique [0002] Most of the fluorescent lamps currently in use use mercury vapor discharge to generate ultraviolet rays with a wavelength of 254 nanometers as the excitation source, and then excite phosphors to emit light. This type of light source is a gas light source. The disadvantage of this type of light source is that the bulb is bulky, especially the calcium halophosphate fluorescent lamp uses mercury, a toxic material, and has a short lifespan, and the color rendering index needs to be further improved. The light source based on light-emitting diodes is an all-solid light source, which has an extremely long life, no pollution, and high lumen efficiency in the future, and is called the light source of the 21st century. Light-emitting diodes can be developed to near-ultraviolet light at present...

Claims

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Application Information

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