Eu < 2 + >-doped blue-light fluorescent material, preparation method thereof and white-light LED light-emitting device

A technology of fluorescent materials and light-emitting devices, which is applied in the direction of light-emitting materials, chemical instruments and methods, electrical components, etc., can solve problems such as cold white light, and achieve the effects of simple preparation methods, improved service life, and good thermal stability

Inactive Publication Date: 2020-12-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This PC-WLED is easily affected, and the color rendering index (Ra4500K), resulting in cold white light due to the absence of red light components in the long wavelength region

Method used

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  • Eu &lt; 2 + &gt;-doped blue-light fluorescent material, preparation method thereof and white-light LED light-emitting device
  • Eu &lt; 2 + &gt;-doped blue-light fluorescent material, preparation method thereof and white-light LED light-emitting device
  • Eu &lt; 2 + &gt;-doped blue-light fluorescent material, preparation method thereof and white-light LED light-emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The chemical composition formula of the blue light fluorescent material of this embodiment is RbBaBP 2 o 8 :xEu 2+ , where x=0.01. Accurately weigh the powder raw material Rb according to the stoichiometric ratio of each element in the chemical formula 2 CO 3 , BaCO 3 , H 3 BO 3 , NH 4 h 2 PO 4 , Eu 2 o 3 Grind in an agate mortar until the raw materials are fully mixed, then transfer to an alumina crucible, cover and place in H 2 and N 2sintered at 900°C for 8 hours in a mixed gas or CO high-temperature tube furnace, took it out after natural cooling, and grinded again for about 30 minutes to obtain a single-phase blue fluorescent material. The results proved that figure 1 , there is no impurity phase in the XRD pattern, indicating that the phase is pure. Blue-light fluorescent materials have high luminous brightness, good chemical stability, and wide excitation and emission ranges, such as figure 2 In the ultraviolet and violet band has a broad strong e...

Embodiment 2

[0042] According to the implementation example 1, H 2 and N 2 The blue light fluorescent material can be synthesized in the mixed gas of CO or CO high-temperature tube furnace at 800-1000°C for 6-9 hours.

Embodiment 3

[0044] A white LED light emitting device, the warm tone white LED light emitting device of the present invention is prepared according to the following method. The white LED light-emitting device includes a packaging substrate, a near-ultraviolet LED chip, a UV curable resin, and three phosphors that can effectively absorb the near-ultraviolet light emitted by the LED chip and release red, green, and blue light; wherein, the blue phosphor It is the fluorescent material synthesized in the above-mentioned embodiment 1, and its chemical composition formula is RbBaBP 2 o 8 :xEu 2+ , where x=0.01. Among them, the near-ultraviolet LED chip is a GaN semiconductor chip, the luminous peak wavelength is 365nm, and the red phosphor is SrAlSiN 3 :Eu 2+ , the green phosphor is Ba 2 SiO 4 :Eu 2+ . Disperse the three fluorescent powders evenly in the UV quick-drying resin glue, cover the chip by coating or dispensing glue, connect the circuit, and obtain the white light LED lighting ...

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Abstract

The invention discloses an Eu < 2 + >-doped blue-light fluorescent material, a preparation method thereof and a white-light LED light-emitting device, and belongs to the technical field of light-emitting materials. The chemical composition formula of the red phosphor is RbBaBP2O8: xEu < 2 + >, wherein x is more than or equal to 0.01 and less than or equal to 0.10. In addition, the invention also discloses a preparation method of the blue-light fluorescent powder. The novel blue-light fluorescent powder disclosed by the invention is single in phase, excellent in thermal stability, high in luminance, good in temperature quenching characteristic and relatively wide in excitation and emission range, and the fluorescence can be kept at 80.6% of the original intensity at 200 DEG C. The preparation method of the fluorescent powder is simple, easy to operate, pollution-free and cheap in raw materials. A warm white light LED manufactured by combining the blue light fluorescent powder and the existing commercial red light and green light fluorescent powder is high in luminance, good in chemical stability and wide in excitation and emission range. In addition, the blue light fluorescent powder is good in color rendering performance, high in energy conversion rate and good in color temperature uniformity, and can meet the requirements of the lighting field.

Description

technical field [0001] The invention belongs to the technical category of inorganic luminescent materials, in particular to a kind of doped Eu 2+ The blue light fluorescent material and its preparation method and white LED lighting device. Background technique [0002] At present, LED is based on semiconductor technology as a new type of solid-state light source. Because of its excellent characteristics such as energy saving, environmental protection, and safety, replacing traditional power-consuming light sources such as incandescent lamps with energy-saving LED lights is considered to be an important way to reduce power consumption worldwide. One step, and has been widely used in the field of lighting and display. [0003] In the lighting field, most of the red, green, and blue primary color phosphors required for the synthesis of white LEDs are doped with rare earths or transition metals. This type of luminescence mainly depends on the occupation of suitable sites in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/71H01L33/50
CPCC09K11/774H01L33/504Y02B20/00
Inventor 夏志国杨至雨
Owner SOUTH CHINA UNIV OF TECH
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