Silicate yellow longpersistent phosphor and preparation method thereof

A phosphor and long afterglow technology, applied in the field of materials, can solve the problems of not long enough afterglow time, not meeting the needs of practical applications, etc., and achieve the effects of simple preparation method, improved afterglow time, and low cost of raw materials

Inactive Publication Date: 2012-12-05
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The afterglow time of the above two yellow long afterglow luminescent materials is not long enough to meet the needs of practical applications.

Method used

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  • Silicate yellow longpersistent phosphor and preparation method thereof
  • Silicate yellow longpersistent phosphor and preparation method thereof
  • Silicate yellow longpersistent phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of Sr 2.96 SiO 5 :0.01Eu, 0.01Dy, 0.05NH 4 F, accurately weigh SrCO according to the chemical dosage ratio 3 4.3698g, SiO 2 0.6008g, Eu 2 o 3 0.0176g, Dy 2 o 3 0.0186g, NH 4 F0.0185g, after grinding the above raw materials evenly, put them into a corundum crucible, compact and cover, put the cover down into a large crucible with carbon powder, bury the corundum crucible with carbon powder, and then put the large crucible Covered and placed in a high-temperature furnace, calcined at 1200°C-1350°C for 6 hours, and cooled to room temperature to obtain Sr 2.96 SiO 5 :0.01Eu, 0.01Dy, 0.05NH 4 F yellow long afterglow phosphor, the excitation source is removed after ultraviolet light excitation, and the afterglow can be observed by human eyes for more than 7 hours in a dark room.

Embodiment 2

[0018] Preparation of Sr 2.96 SiO 5 :0.01Eu, 0.03Dy, 0.05NH 4 F, accurately weigh SrCO according to the chemical dosage ratio 3 4.3698g, SiO 2 0.6008g, Eu 2 o 3 0.0176g, Dy 2 o 3 0.0559g, NH 4 F0.0185g, after grinding the above raw materials evenly, put them into a corundum crucible, compact and cover, put the cover down into a large crucible with carbon powder, bury the corundum crucible with carbon powder, and then put the large crucible Covered and placed in a high-temperature furnace, calcined at 1200°C-1350°C for 6 hours, and cooled to room temperature to obtain Sr 2.96 SiO 5 :0.01Eu, 0.03Dy, 0.05NH 4 F yellow long afterglow phosphor, the excitation source is removed after ultraviolet light excitation, and the afterglow can be observed by human eyes for more than 10 hours in a dark room.

Embodiment 3

[0020] Preparation of Sr 2.96 SiO 5 :0.01Eu, 0.03Dy, 0.05BaF 2 , accurately weigh SrCO according to the stoichiometric ratio 3 4.3698g, SiO 2 0.6008g, Eu 2 o 3 0.0176g, Dy 2 o 3 0.0559g, BaF 2 0.0877g, after grinding the above raw materials evenly, put them into a corundum crucible, compact and cover, put the cover down into a large crucible with carbon powder, bury the corundum crucible with carbon powder, and then add the large crucible Put the cover into a high-temperature furnace, calcinate at 1200°C-1350°C for 6 hours, and cool to room temperature to obtain Sr 2.96 SiO 5 :0.01Eu, 0.03Dy, 0.05BaF 2 Yellow long afterglow phosphor, the excitation source is removed after ultraviolet light excitation, and the afterglow can be observed by human eyes for more than 12 hours in a dark room.

[0021] image 3 Shown as Sr 2.96 SiO 5 :0.01Eu, 0.03Dy, 0.05BaF 2 Excitation and emission spectra of phosphors. Figure 4 Shown as Sr 2.96 SiO 5 :0.01Eu, 0.03Dy, 0.05BaF 2 ...

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Abstract

The invention discloses a silicate yellow longpersistent phosphor, which is prepared by adding fluoride into strontiumsilicate phosphor mixed with europium and arrowhead, and the chemical formula thereof is EuaDybSr3-a-bSiO5:cMFx, wherein a is less than or equal to 0.5 and larger than or equal to 0.005, b is less than or equal to 0.5 and larger than or equal to 0, c is less than or equal to 0.30 and larger than or equal to 0.01, x is equal to 1, 2 or 3, the fluoride serves as a cosolvent and an auxiliary defect-forming agent, M is one of alkaline-earth metals such as Mg, Ca, Sr, Ba, Li, Na, K, NH4, NH4H, Zn or Cd. The silicate yellow longpersistent phosphor of the invention perpared by high-temperature solid-phase reaction process comprising the following steps: weighting the oxide and the fluoride of each element in the structural formula of the phosphor according to the needed dosages, porphyrizing the oxide and the fluoride evenly, calcining under reducing atmosphere at the temperature of 1200-1350 DEG C for 4-6 hours, and pulverizing calcined products to obtain finish products. The preparation method is simple; the material cost is low; the silicate yellow longpersistent phosphor can emit yellow longpersistence after being excited by lights the wavelength of which are within 250-550nm; and after the silicate yellow longpersistent phosphor is irradiated by ultraviolet lights for 20-30 minutes, an excitation source is removed, people can observe the yellow longpersistence with eyes in a darkroom for 7-12 hours.

Description

technical field [0001] The invention relates to a long afterglow phosphor and a preparation method thereof, belonging to the field of materials. Background technique [0002] Long afterglow material is also called light storage material, commonly known as "luminous powder", which is widely used in low light indication, architectural decoration and arts and crafts and other fields. The traditional long afterglow material is sulfide, which has the disadvantages of low luminous brightness, short afterglow time, and poor chemical stability. In the 1990s, aluminate system and silicate system long afterglow materials have become the mainstream of long afterglow materials, and their luminous brightness, afterglow time and chemical stability have been significantly improved compared with sulfide materials, and have reached the level of practical application. needs, industrialized production has been realized. However, the colors of the existing long-lasting materials put into comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59
Inventor 肖思国廖俊杰丁建文阳效良
Owner XIANGTAN UNIV
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