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Near-ultraviolet effective excitation green phosphor and preparation method and application thereof

A green phosphor, near-ultraviolet technology, applied in the field of green phosphor, can solve the problems of large emission color temperature drift, mismatched excitation light source, low luminous efficiency, etc., achieves good chemical stability, low production conditions and equipment requirements, The effect of high luminous efficiency

Pending Publication Date: 2019-02-22
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, some green phosphors have been developed, but there are problems such as low luminous efficiency, mismatching excitation light source, large luminous color temperature drift, etc., especially the green powder excited by blue light generally has low luminous efficacy.

Method used

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  • Near-ultraviolet effective excitation green phosphor and preparation method and application thereof
  • Near-ultraviolet effective excitation green phosphor and preparation method and application thereof
  • Near-ultraviolet effective excitation green phosphor and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A compositional expression for Y 2.92 Al 5 o 12 :0.08Ce 3+ The preparation method of the green fluorescent powder that the near-ultraviolet effectively excites comprises the following steps:

[0043] 1) Follow Y 2.92 Al 5 o 12 :0.08Ce 3+ The stoichiometric ratio weighs yttrium oxide, cerium oxide and aluminum oxide;

[0044] 2) Mix yttrium oxide, cerium oxide and aluminum oxide weighed in step 1), add citric acid and 25% dilute nitric acid, and conduct a heating reaction at 80° C. for 6 hours to obtain a gel;

[0045] 3) The gel obtained in step 2) is dried using a two-step optimization method. The first step is pre-dried at a temperature of 80°C, and the pre-drying time is 6h; the second step is carried out at a temperature of 120°C Steady drying treatment, the time of steady drying treatment is 12 hours, and a fluffy foamy solid is obtained;

[0046] 4) The fluffy foamy solid obtained in step 3) is sintered by a segmented treatment method. In the first stage,...

Embodiment 2

[0053] A compositional expression for Y 2.91 Al 5 o 12 :0.09Ce 3+ The preparation method of the green fluorescent powder that the near-ultraviolet effectively excites comprises the following steps:

[0054] 1) Follow Y 2.91 Al 5 o 12 :0.09Ce 3+ The stoichiometric ratio weighs yttrium oxide, cerium oxide and aluminum oxide;

[0055] 2) Mix yttrium oxide, cerium oxide and aluminum oxide weighed in step 1), add citric acid and 10% dilute nitric acid, and conduct a heating reaction at 60° C. for 12 hours to obtain a gel;

[0056] 3) The gel obtained in step 2) is dried using a two-step optimization method. The first step is pre-dried at a temperature of 60°C, and the pre-drying time is 12h; the second step is carried out at a temperature of 110°C Steady drying treatment, the time of firm drying treatment is 24 hours, and a fluffy foamy solid is obtained;

[0057] 4) The fluffy foamy solid obtained in step 3) is sintered by adopting a segmented treatment method. In the fir...

Embodiment 3

[0060] A compositional expression for Y 2.94 Al 5 o 12 :0.06Ce 3+ The preparation method of the green fluorescent powder that the near-ultraviolet effectively excites comprises the following steps:

[0061] 1) Follow Y 2.94 Al 5 o 12 :0.06Ce 3+ The stoichiometric ratio weighs yttrium oxide, cerium oxide and aluminum oxide;

[0062] 2) Mix yttrium oxide, cerium oxide and aluminum oxide weighed in step 1), add citric acid and 30% dilute nitric acid, and conduct a heating reaction at 70° C. for 8 hours to obtain a gel;

[0063] 3) Use a two-step optimization method to dry the gel obtained in step 2). The first step is to pre-dry at a temperature of 90°C, and the pre-drying time is 4h; the second step is to carry out at a temperature of 130°C Stable drying treatment, the time of firm drying treatment is 8 hours, and a fluffy foamy solid is obtained;

[0064] 4) The fluffy foamy solid obtained in step 3) is sintered by adopting a segmented treatment method, the first stage...

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Abstract

The invention discloses a near-ultraviolet effective excitation green phosphor and a preparation method and application thereof. A composition expression of the green phosphor is Y3-xAl5O12:xCe3+, x refers to the doping mole number of Ce3+ ions substituting Y3+ ions, and x=0.06-0.09. The green phosphor has an average particle size of 30-300nm, an emission wavelength of 520-580nm and an excitationwavelength of 330-350nm. The green phosphor is prepared by a sol-gel method. The green phosphor is a broad-spectrum high-efficiency green phosphor suitable for near-ultraviolet excitation, has high luminous efficiency, is simple in preparation method, saves energy and cost, and is suitable for a white LED technology excited by a near-ultraviolet chip in 330-350nm band. The green phosphor can alsobe used as a multi-level green excitation source.

Description

technical field [0001] The invention belongs to the field of green fluorescent powder, and in particular relates to a green fluorescent powder effectively excited by near-ultraviolet and its preparation method and application. Background technique [0002] In recent years, the wide bandgap GaN LED ultraviolet chip manufacturing technology has developed rapidly. At present, LED chips from 254-400nm can be manufactured, especially the ultraviolet chip technology of 330-400nm is more mature, and can be used as ultraviolet white light and special light source development. Excitation light source. [0003] At present, some green phosphors have been developed, but there are problems such as low luminous efficiency, mismatch of excitation light source, and large drift of luminous color temperature, especially the green powder excited by blue light generally has low luminous efficacy. [0004] Therefore, it is necessary to study a broad-spectrum high-efficiency green phosphor suita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80B82Y30/00B82Y40/00H01L33/50
CPCB82Y30/00B82Y40/00C09K11/7774H01L33/502
Inventor 王忆王梦霞孙小敏
Owner WUYI UNIV
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