Green phosphor and preparation method thereof

A technology of green fluorescent powder and fluorescent powder, which is applied in the field of materials science, can solve the problems of green fluorescent powder luminous efficiency, luminance not meeting practical requirements, low quantum efficiency of fluorescent powder, high preparation temperature requirements, etc., achieving remarkable technological progress , high quantum efficiency and mature technology

Inactive Publication Date: 2017-02-08
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a kind of green fluorescent powder and preparation method, described this kind of green fluorescent powder and preparation method should solve the luminous efficiency of green fluorescent powder in the prior art, the luminance reaches It does not meet the practical requirements, and the technical problems that the process is not easy to control; at the same time, it is necessary to solve the technical problems of low quantum efficiency of phosphor powder and high preparation temperature requirements

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  • Green phosphor and preparation method thereof
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  • Green phosphor and preparation method thereof

Examples

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Effect test

Embodiment 1

[0016] A kind of green phosphor Sr 9-x Mg 1.5 (PO 4 ) 7 : xTb 3+ (x=0.01) preparation method, comprises the steps:

[0017] a. Weigh 3.2032 g of strontium carbonate, 0.3446 g of basic magnesium carbonate, 0.0064 g of terbium oxide, and 0.5602 g of ammonium dihydrogen phosphate, and place them in a mortar;

[0018] b. Grind the mixture obtained in a for 50 minutes, then add alcohol and grind it for 60 minutes;

[0019] c. Put the mixture obtained in b into a crucible boat, place the crucible in a double-temperature zone tube furnace, and calcinate at 1300°C for 9 hours under a CO reducing atmosphere, then cool naturally and grind it into powder to obtain single-matrix phosphate green light phosphor.

[0020] Sr 9-x Mg 1.5 (PO 4 ) 7 : xTb 3+ (x=0.01) Under the excitation of 230nm ultraviolet light, the main emission peak of the emission spectrum is located at 544nm, and the green light emission is strong and pure. attached image 3 Sr in this example 9-x Mg 1.5 (P...

Embodiment 2

[0022] A kind of green phosphor Sr 9-x Mg 1.5 (PO 4 ) 7 : xTb 3+ (x=0.05) preparation method, comprises the steps:

[0023] a. Weigh 3.1766 g of strontium carbonate, 0.3558 g of basic magnesium carbonate, 0.1329 g of terbium nitrate, and 0.5790 g of ammonium dihydrogen phosphate, and place them in a mortar;

[0024] b. Grind the mixture obtained in a for 120min, then add alcohol and grind for 50min;

[0025] d. Put the mixture obtained in b into a crucible boat and place it in a tube furnace with dual temperature zones. After calcining at 1200°C for 8 hours under a CO reducing atmosphere, cool naturally and grind it into powder to obtain a single-matrix phosphate that emits green light. Phosphor.

[0026] Sr 9-x Mg 1.5 (PO 4 ) 7 : xTb 3+ (x=0.05) Under the excitation of 230nm ultraviolet light, the main emission peak of the emission spectrum is located at 544nm, and the green light emission is strong and pure. The chromaticity coordinates of the prepared green phosp...

Embodiment 3

[0028] A kind of green phosphor Sr 9-x Mg 1.5 (PO 4 ) 7 : xTb 3+ (x=0.1) preparation method, comprises the steps:

[0029] a. Weigh 3.1407 g of strontium carbonate, 0.3708 g of basic magnesium carbonate, 0.0693 g of terbium oxide, and 0.6042 g of ammonium dihydrogen phosphate, and place them in a mortar;

[0030] b. Grind the mixture obtained in a for 70 min, then add acetone and grind for 50 min;

[0031] c. Put the mixture obtained in b into a crucible boat and place it in a tube furnace with two temperature zones, calcinate at 1100° C. for 10 hours under a CO reducing atmosphere, cool naturally and grind into powder.

[0032] attached figure 1 Be the X-ray diffraction pattern of this embodiment, all emission lines are all with Sr 9 Mg 1.5 (PO 4 ) 7 The standard peak positions are the same. The resulting crystal is a single Sr 9 Mg 1.5 (PO 4 ) 7 : Tb 3+ Trigonal, Tb 3+ In the crystal instead of Sr 3+ position, its structure does not change and does not cont...

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Abstract

The invention discloses green phosphor. The chemical characteristic expression is Sr9-xMg1.5(PO4)7:xTb<3+>, wherein x is more than 0 and less than or equal to 0.3. The invention also provides a method for preparing the green phosphor. The method comprises the following steps of: weighing compounds corresponding to Sr, Mg and Tb and phosphate according to a molar ratio, uniformly mixing, grinding for 50-120 minutes, adding the powder into a reaction container, calcining in a high temperature furnace at the temperature of 1100-1300 DEG C in a CO or nitrogen-hydrogen mixed atmosphere for 5-10 hours, naturally cooling, and grinding into powder, thereby obtaining single-matrix phosphate green-emitting phosphor. The phosphor prepared by the method disclosed by the invention is high in quantum efficiency, adjustable in green light and simple in method, and the related process is mature, stable and low in cost.

Description

technical field [0001] The invention belongs to the field of material science, and relates to a rare earth luminescent material, in particular to a green fluorescent powder and a preparation method thereof. Background technique [0002] The current energy problem is serious, and energy saving and environmental protection have become a major concern of all countries. Some countries prohibit the use of incandescent lamps and gradually phase them out, and promote energy-saving fluorescent lamps. In recent years, energy-saving compact and straight tube fluorescent lamps have achieved greater development in China. Compared with incandescent lamps and fluorescent lamps, white light-emitting diodes (white light-emitting diodes, WLEDs) have long service life, high efficiency, resistance to harsh environments, wide spectral range, long visual distance, green environmental protection, no pollution, and energy saving. , Safety, good color rendering, no flicker and small size and other...

Claims

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Application Information

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IPC IPC(8): C09K11/71
CPCC09K11/7753
Inventor 房永征郑新峰刘玉峰张娜侯京山赵国营丁艳花李倩倩
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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