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Yellow phosphor powder for white light emitting diode, preparation method thereof and white light emitting diode

A technology of light-emitting diodes and yellow phosphors, applied in luminescent materials, chemical instruments and methods, electrical components, etc., can solve problems such as low luminous efficiency, phosphor color reabsorption, and difficulty in ratio control

Active Publication Date: 2017-07-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the use of ultraviolet chips to coat red, green and blue three primary color phosphors has problems such as color reabsorption and difficulty in ratio control.
Although many new systems have been discovered and reported for single-matrix white phosphors, such as CaIn 2 o 4 :Eu 3+ 、Sr 2 SiO 4 :Eu 2+ and Ca 9 Y (PO 4 ) 7 :Eu 2+ , Mn 2+ etc., but the luminous efficiency is still low

Method used

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  • Yellow phosphor powder for white light emitting diode, preparation method thereof and white light emitting diode
  • Yellow phosphor powder for white light emitting diode, preparation method thereof and white light emitting diode
  • Yellow phosphor powder for white light emitting diode, preparation method thereof and white light emitting diode

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preparation example Construction

[0035] Correspondingly, the present invention provides a method for preparing yellow phosphor powder for white light emitting diodes, comprising the following steps:

[0036] mixing the calcium-containing compound, the hydrogen phosphate-containing compound, the cerium-containing compound and activated carbon and then grinding to obtain a mixture;

[0037] Calcining the mixture in a reducing atmosphere to obtain a yellow phosphor powder for white light-emitting diodes with the chemical formula shown in formula (I);

[0038] Ca 4（1-x） O(PO 4 ) 2 :xCe 3+ Formula (I);

[0039] In formula (I), 0.0001≤x≤0.1.

[0040] The present invention uses compounds containing corresponding elements or groups as raw materials, activated carbon as an auxiliary agent, and adopts a solid-phase synthesis method to prepare the yellow fluorescent powder for white light-emitting diodes with the chemical formula shown in formula (I).

[0041] In the embodiment of the present invention, the calciu...

Embodiment 1

[0057] According to the molar ratio of 1:1:0.01, CaCO 3 (analytical pure), CaHPO 4 (analytical pure) and CeO 2 (99.99%) mixed, and 20% (mass fraction) of activated carbon powder was added, fully ground to obtain a mixture.

[0058] Put the mixture into a corundum crucible, then into a large corundum crucible, fill with carbon rods around it, then put it into a high-temperature furnace, and bake it at 1350°C in the presence of carbon monoxide gas. After 10 hours, cool it naturally to Take out and grind at room temperature to obtain a product in the form of yellow powder, which is yellow phosphor powder for white light-emitting diodes.

[0059] X-ray diffraction analysis was carried out on the obtained product, the instrument used was German Bruker / D8-FOCUS X-RayDiffractometer, the radiation source was Cu Kα1 (λ=1.5405nm), the scanning range: 2θ=10°~70°, and the scanning speed was 10° / minute. See results figure 1 , figure 1 It is the XRD diffraction spectrum of the produc...

Embodiment 2

[0062] According to the molar ratio of 1:1:0.01, CaCO 3 (analytical pure), CaHPO 4 (analytical pure) and CeO 2 (99.99%) mixed, and 20% (mass fraction) of activated carbon powder was added, fully ground to obtain a mixture.

[0063] Put the mixture into a corundum crucible, then into a large corundum crucible, fill the surrounding with carbon rods, then put it into a high-temperature furnace, and bake it at 1400°C in the presence of carbon monoxide gas. After 7 hours, naturally cool to room temperature , take out and grind to obtain a product in the form of yellow powder, which is yellow phosphor powder for white light-emitting diodes, and the chemical formula is shown in formula (I).

[0064] Gained product is carried out the test of excitation spectrum and emission spectrum, the result sees figure 2 and image 3 . Depend on figure 2 and image 3 It can be known that the yellow phosphor powder for white light-emitting diodes can be effectively excited by near-ultravio...

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Abstract

The invention provides a yellow fluorescent powder for white light emitting diodes and a preparation method thereof. In the method, a calcium-containing compound, a hydrogen phosphate-containing compound, a cerium-containing compound and activated carbon are mixed and then ground to obtain a mixture; the mixture is reduced to Roasting in the atmosphere to obtain the yellow phosphor powder for white light emitting diodes with the chemical formula shown in formula (I), where 0.0001≤x≤0.1. The present invention uses tetracalcium phosphate as a substrate and cerium ions as an activator to prepare a yellow fluorescent powder. The excitation band of the fluorescent powder overlaps well with the emission peak of a gallium nitride light source, and can be effectively excited by a gallium nitride light source to produce The broad peak emission of 500nm-750nm can be used as phosphor powder in white light emitting diode with blue light gallium nitride as light source. The method is simple and environmentally friendly, and is suitable for popularization. The invention also provides a white light emitting diode. Ca4(1‑x)O(PO4)2:xCe3+ formula (I).

Description

technical field [0001] The invention relates to the technical field of fluorescent powder for white light emitting diodes, in particular to a yellow fluorescent powder for white light emitting diodes, a preparation method thereof and a white light emitting diode. Background technique [0002] Light Emitting Diode (LED for short) is a new type of semiconductor lighting source, which has become a research hotspot in recent years due to its advantages of energy saving, environmental protection, long life and high luminous efficiency. LEDs of different semiconductor materials can emit light of different colors, such as indium gallium nitride diodes emit blue light. At present, there are two main types of white light-emitting diodes: phosphor-converted white light LEDs and multi-chip white light LEDs. White LED phosphors can be divided into three categories: yellow phosphors that can be excited by blue LED chips; red, green, and blue phosphors that can be excited by near-ultravi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/71H01L33/50
Inventor 李成宇贾永雷庞然苏锵
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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