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Mayenite-structure fluorescent powder for white light emitting of LED

A phosphor and mayenite technology, applied in the field of rare earth luminescent materials, can solve the problems of phosphor lack of red band, low color rendering index, complex control circuit, etc., to overcome the difference in light color decay speed and color reabsorption, Simple preparation process and long fluorescence lifetime

Inactive Publication Date: 2018-05-04
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phosphor powder prepared by the first method has defects such as lack of red band, low color rendering index, and high correlated color temperature.
In the second method, different chips have different light decays of the three primary colors, resulting in unstable color temperature, complicated control circuit, and high cost.
The third method is the most commonly used method, but there are problems of ratio control and color reabsorption in mixed phosphors of various substrates (for example, red phosphors can not only absorb ultraviolet light but also blue light)
However, so far, there is no single-doped mayenite structure matrix phosphor that emits white light in the prior art

Method used

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  • Mayenite-structure fluorescent powder for white light emitting of LED
  • Mayenite-structure fluorescent powder for white light emitting of LED
  • Mayenite-structure fluorescent powder for white light emitting of LED

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The present embodiment LED uses the mayenite structure fluorescent powder that white light emits, and the chemical structural formula of this fluorescent powder is as follows: Ca 12 Al 14 o 32 Cl 2 :0.5Dy 3+ .

[0032] The preparation method is: weigh CaO (analytical pure) 1.2338g, Al 2 o 3 (Analytical pure) 1.4274g, CaCl 2 (Analytical pure) 0.2220g, Dy 2 o 3 (99.99%) 0.1850 g. The above-mentioned raw materials are uniformly mixed and put into a mortar for thorough grinding, then put into a corundum crucible, and then high-temperature solid-phase synthesis is carried out under an air atmosphere. In this embodiment, the calcination temperature is set at 1200° C., and the calcination time is 15 hours. After the muffle furnace is cooled to room temperature, the sample is taken out and fully ground to obtain a mayenite structure phosphor sample for LED white light emission. The chemical structural formula of the phosphor is Ca 12 Al 14 o 32 Cl 2 :0.5Dy 3+ . ...

Embodiment 2

[0036] The present embodiment LED uses the mayenite structure fluorescent powder that white light emits, and the chemical structural formula of this fluorescent powder is as follows: Ca 12 Al 14 o 32 f 2 :0.03Dy 3+ .

[0037] The preparation method is: weigh CaO (analytical pure) 1.2338g, Al 2 o 3 (Analytical pure) 1.4274g, CaF 2 (Analytical pure) 0.1562g, Dy 2 o 3 (99.99%) 0.0111 g. The above-mentioned raw materials are uniformly mixed and fully ground, then put into a corundum crucible, and then high-temperature solid-phase synthesis is carried out under an air atmosphere. In this embodiment, the calcination temperature is set at 1200° C., and the time is 15 hours. After the muffle furnace is cooled to room temperature, the sample is taken out and fully ground to obtain the sample Ca 12 Al 14 o 32 f 2 :0.03Dy 3+ .

[0038] Test the phase structure of the sample with D8Advance X-ray diffractometer, by this sample and Ca 12 Al 14 o 32 f 2 Comparison of the ...

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Abstract

The invention relates to mayenite-structure fluorescent powder for white light emitting of LED. The chemical structural formula of the fluorescent powder is: Ca12Al14O32A2:xDy<3+>, where A is one of Cl and F; x is a molar ratio of Dy<3+> substituting Ca<2+> and is greater than or equal to 0.01 and less than or equal to 0.6. The fluorescent powder is single-substrate white-light fluorescent powderdoped with Dy<3+>, and has the advantages of long fluorescence lifetime and high light chroma and can be applied to near-ultraviolet LED excitation.

Description

technical field [0001] The invention relates to the technical field of rare earth luminescent materials, in particular to a mayenite structure fluorescent powder for LEDs that emit white light. Background technique [0002] Light-emitting diode (LED) is recognized as a new light source in the 21st century. Because of its advantages such as energy saving and environmental protection, high luminous efficiency, good color rendering, long life, high brightness, and fast response, it can not only replace traditional lighting equipment , and can also be applied to large display screens, backlights of electronic equipment, thermoluminescence detection and other fields. There are generally three methods for the realization of white light LED: (1) blue light LED chip excites YAG yellow phosphor powder, and white light is synthesized by LED blue light and yellow-green light emitted by phosphor powder; White light; (3) The ultraviolet light LED chip excites three phosphor powders to e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
CPCC09K11/7706Y02B20/00
Inventor 梁金生孙剑锋李天宇
Owner HEBEI UNIV OF TECH
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