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Synthesis method of broadband excited phosphate red phosphor

A technology of red phosphor and broadband excitation, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of single excitation wavelength, easy drift of light color, short excitation range, etc., and achieve the effect of improving emission intensity

Pending Publication Date: 2020-11-24
HEZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the defects of single excitation wavelength, easy drift of light color, and short excitation range of existing red phosphors, and provides a method for preparing broadband-excited phosphate red phosphors by using a high-temperature solid-phase method. Easy to control and synthesized products with good luminous performance

Method used

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  • Synthesis method of broadband excited phosphate red phosphor
  • Synthesis method of broadband excited phosphate red phosphor
  • Synthesis method of broadband excited phosphate red phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0019] Weigh the medicines according to the raw material ratio in Table 1. Mix the medicines evenly in an agate mortar for 30 minutes; put the evenly ground sample into the corundum crucible, and insert the crucible with the sample into the one containing the activated carbon powder. In the large crucible, cover the lid, put the large crucible and the crucible lid in the oven, bake at 100~200℃ for 2 hours, then put the big crucible into the muffle furnace while it is hot, and bake at the temperature of 900~1000℃ for 7~ After 10 hours, naturally cooled to room temperature, take it out and grind uniformly to obtain a white powder. For the sake of comparison, the temperature in Examples 1 to 4 is unified at 920°C, and the reaction time is 10 hours.) After cooling to room temperature, take it out and grind uniformly to obtain a white powder.

[0020] Table 1 Raw material ratio

[0021]

[0022] Place the samples of Examples 1 and 2 in the solid sample tank of the FLS920 transient / stea...

Embodiment 5～12

[0026] Weigh the medicines according to the raw material ratio in Table 2. Mix the medicines evenly in an agate mortar for 30 minutes; put the evenly ground sample into the corundum crucible, and insert the crucible with the sample into the one containing the activated carbon powder. In the large crucible, cover the lid, put the large crucible and the lid of the crucible in the oven, bake at 100~200℃ for 2 hours, then put the big crucible in the muffle furnace while it is hot, and bake at the temperature of 900~1000℃ for 7~ After 10 hours, naturally cooled to room temperature, take it out and grind uniformly to obtain white powder. For the convenience of comparison, the temperature in Examples 5-12 is uniformly 920°C, and the reaction time is 10 hours) After cooling to room temperature, take it out and grind uniformly to obtain broadband excited phosphate red phosphor.

[0027] Table 2 Raw material ratio

[0028]

[0029] The prepared Ce 3+ ,Mn 2+ Co-doped phosphors, the emission ...

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Abstract

The invention provides a synthesis method of a broadband excited phosphate red phosphor. The method comprises the steps of firstly weighing corresponding oxide, carbonate and phosphate, mixing the weighed materials, grinding the materials in an agate mortar evenly and then putting the powder into a corundum crucible; putting the corundum crucible containing samples into a large crucible containingactivated carbon powder, covering the large crucible with a lid, putting the large crucible and the lid into a drying oven, and carrying out baking at 100-200 DEG C for 2 hours; and putting the largecrucible into a muffle furnace while the large crucible is hot, carrying out roasting at 900-1,000 DEG C for 7-10 hours, carrying out natural cooling to room temperature, then taking out a product and grinding the product evenly to obtain white powder. The broadband excited phosphate red phosphor prepared by the method overcomes the defects that a traditional phosphor is poor in color rendering property and small in excitation wavelength; and by using a method of codoping Ce<3+> / Mn<2+>, a phosphate matrix red phosphor with good color rendering is prepared within a wide ultraviolet excitationrange through energy transfer between ions.

Description

Technical field [0001] The invention belongs to the field of powder material synthesis, and specifically relates to a method for synthesizing fluorescent powder by high-temperature solid-phase reaction. Background technique [0002] Nowadays, most white light LED devices are a combination of LED blue chips 3 Al 5 O 12 :Ce 3+ (YAG) or the combination of ultraviolet / near-ultraviolet LED chips, red, green, and blue phosphors. In this method, the role of phosphors as light conversion materials is very important. Main indicators that affect the luminous efficiency, service life, color rendering index and color temperature of white LED products. In the research of phosphors for white light LEDs, the preparation of green powder and yellow powder to luminous performance has reached a mature stage, but the luminous efficiency and stability of red powder cannot be compared with other color powders. For a long time, red phosphors for LEDs are mostly limited to alkaline earth metal sulfide ...

Claims

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Application Information

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IPC IPC(8): C09K11/71
CPCC09K11/71C09K11/7724
Inventor 莫福旺汤泉姜微岑雨涓凌瑜黄厚烨黄志春沈车
Owner HEZHOU UNIV
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