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Red phosphor that can be excited by near ultraviolet and blue light, preparation method and application

A technology of red phosphor and blue light excitation, which is applied in the field of preparation, red phosphor, and luminescent materials, can solve the problems of not meeting the application requirements of WLEDs, the high price of rare earth ions, and the lack of red phosphor, and meet the production conditions and equipment requirements. High, easy to handle, good crystallinity effect

Active Publication Date: 2019-03-15
NANJING TONGLI CRYSTAL MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although a large number of red phosphors have been developed, there are relatively few red phosphors that can be effectively excited by near-ultraviolet and blue light.
Traditional commercial red phosphors are doped with rare earth ions in solid materials and excited under ultraviolet light (less than 365 nanometers), but cannot meet the requirements of WLEDs because they do not match the blue light chip (the excitation region is generally 380-470 nanometers). In addition, rare earth ions are expensive, and the global supply is becoming increasingly scarce. Therefore, in recent years, it has become a trend to find low-cost, high-performance phosphor materials

Method used

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  • Red phosphor that can be excited by near ultraviolet and blue light, preparation method and application
  • Red phosphor that can be excited by near ultraviolet and blue light, preparation method and application
  • Red phosphor that can be excited by near ultraviolet and blue light, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of Ba 4 Ti 10 al 1.998 mn 0.002 o 27

[0041] According to the chemical formula Ba 4 Ti 10 al 1.998 mn 0.002 o 27 , weigh barium nitrate Ba(NO 3 ) 2 : 6.9693 g, titanium dioxide TiO 2 : 5.3244 g, aluminum oxide Al 2 o 3 : 0.6791 g, manganese dioxide MnO 2 : 0.0012 g, fully ground in an agate mortar and mixed evenly, placed in an alumina crucible, pre-calcined for the first time in an air atmosphere, pre-calcined in a muffle furnace at 350 ° C for 5 hours, cooled to At room temperature, after taking out the sample, fully mix and grind evenly; then pre-calcine for the second time in an atmosphere containing oxygen, pre-calcine in a muffle furnace at 550°C for 7 hours, cool to room temperature, take out the sample and mix thoroughly and grind evenly again; Finally, in an atmosphere containing oxygen, calcined at 1050° C. for 9 hours in a muffle furnace, and cooled to room temperature to obtain a red phosphor activated by tetravalent manganese ion...

Embodiment 2

[0048] Preparation of Ba 4 Ti 10 al 1.99 mn 0.01 o 27

[0049] According to the chemical formula Ba 4 Ti 10 al 1.99 mn 0.01 o 27 , weigh barium carbonate BaCO 3 : 5.2624 g, titanium dioxide TiO 2 : 5.3244 grams, aluminum nitrate Al (NO 3 ) 3 9H 2 O: 2.8257 grams, manganese acetate Mn (CH 3 COO) 2 : 0.0115 g, fully ground in an agate mortar and mixed evenly, placed in an alumina crucible, pre-calcined for the first time in an air atmosphere, calcined in a muffle furnace at 400 ° C for 6 hours, cooled to room temperature , after taking out the sample, fully mix and grind evenly; then pre-calcine for the second time in an atmosphere containing oxygen, calcinate in a muffle furnace at 600 ° C for 8 hours, cool to room temperature, take out the sample and mix well again and grind evenly; finally In an atmosphere containing oxygen, calcining at 1100°C for 10 hours in a muffle furnace and cooling to room temperature can obtain a red phosphor activated by tetravalent m...

Embodiment 3

[0052] Preparation of Ba 4 Ti 10 al 1.986 mn 0.014 o 27

[0053] According to the chemical formula Ba 4 Ti 10 al 1.986 mn 0.014 o 27 , Weigh barium hydroxide Ba(OH) 2 : 4.5693 g, titanium dioxide TiO 2 : 5.3244 g, aluminum carbonate Al 2 (CO 3 ) 3 : 1.5491 g, manganese carbonate MnCO 3 : 0.0107 g, fully ground in an agate mortar and mixed evenly, placed in an alumina crucible, pre-calcined for the first time under air atmosphere, calcined in a muffle furnace at 300 ° C for 3 hours, cooled to room temperature , after taking out the sample, fully mix and grind evenly; then pre-calcine for the second time in an atmosphere containing oxygen, calcinate in a muffle furnace at 500 ° C for 6 hours, cool to room temperature, take out the sample and mix well again and grind evenly; finally in Calcined in a muffle furnace at 1000°C for 8 hours in an atmosphere containing oxygen, and cooled to room temperature to obtain a red phosphor activated by tetravalent manganese ions...

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Abstract

The invention discloses near ultraviolet and blue light excitable red fluorescent powder, as well as a preparation method and application thereof, and belongs to the technical field of inorganic luminescent materials. The fluorescent powder is non-rare earth ion doped aluminate having a chemical formula of Ba4Ti10Al2-2xMn2xO27, wherein x is the molar percentage coefficient of Mn<4+> ions doped in aluminate, and has a doping range of more than or equal to 0.001 and less than or equal to 0.2, and simple high-temperature solid-phase method and sol-gel method are adopted. Under excitation of near ultraviolet and blue light, red fluorescence having a center wavelength of about 654 nanometers is emitted and has high illumination strength and good stability, and is matched with the excited wave of a blue light chip, and light source color temperature and color developing index improvement in WLEDs can be fulfilled. The red fluorescent powder is simple in preparation method and easy to operate, is low in cost, is not limited by raw material supply, and is easy for operation and industrial production; and waste gas or waste liquid emission is avoided the production process, so that the red fluorescent powder is an environment-friendly inorganic fluorescent material.

Description

technical field [0001] The invention relates to a luminescent material, a preparation method and an application, in particular to a red fluorescent powder that can be excited by near ultraviolet and blue light, a preparation method and an application, and belongs to the technical field of inorganic luminescent materials. Background technique [0002] White LEDs have the characteristics of high brightness, long life, energy saving, and environmental protection. As a new type of green light source, they are widely used in signal lights, indicator lights, display screens, and landscape lighting. The currently used white LEDs are mainly composed of blue LEDs and YAG phosphors to form white light. Although there has been great progress in quality and quantity, there are still some key problems. The biggest defect is that the color rendering index is low and the color rendering index is low. The better index is only around 85. It has been proved by a large number of studies that i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/67H01L33/50
CPCC09K11/67H01L33/502
Inventor 乔学斌
Owner NANJING TONGLI CRYSTAL MATERIALS RES INST CO LTD
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