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Fluorescent material emitting yellow light under near-ultraviolet excitation, preparation method and application

A near-ultraviolet light and fluorescent material technology, applied in the field of fluorescent materials, can solve the problems of high cost in the preparation process, low stability and luminous efficiency, low color rendering index, etc., and achieves pure chromaticity, safe and reliable method. Control and improve the effect of color rendering index

Active Publication Date: 2019-04-16
NANJING TONGLI CRYSTAL MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although some yellow phosphors have been developed, most of them are excited under ultraviolet light (less than 365 nanometers), which does not match the blue light chip (the excitation area is generally 380-470 nanometers), so it cannot stably meet the application requirements of WLEDs. Therefore, there are relatively few yellow phosphors that can be effectively excited by near-ultraviolet light at this stage, and the stability and luminous efficiency are not high, resulting in low color rendering index and cold hue. Toxic gases such as sulfides are harmful to the environment, and the manufacturing process is troublesome and the cost of the preparation process is relatively high

Method used

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  • Fluorescent material emitting yellow light under near-ultraviolet excitation, preparation method and application
  • Fluorescent material emitting yellow light under near-ultraviolet excitation, preparation method and application
  • Fluorescent material emitting yellow light under near-ultraviolet excitation, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to the chemical formula Ca 4.25 Dy 0.75 Nb 4 Ti 3 o 21 The stoichiometric ratio of each element in, respectively weighed calcium carbonate CaCO 3 : 2.1250 grams; dysprosium oxide Dy 2 o 3 : 0.6995 g; niobium pentoxide Nb 2 o 5 : 2.6580 g; Titanium dioxide TiO 2 : 1.1981 grams are the raw materials for preparation, the raw materials weighed are ground respectively, and mixed uniformly; the mixture obtained is pre-sintered for the first time under air atmosphere, and the pre-sintering temperature is 900 ° C, and the time is 10 hours; the sample after cooling is ground evenly Finally, the second pre-sintering in the air atmosphere, the pre-sintering temperature is 1200 ℃, the pre-sintering time is 1 hour; after the sample is cooled, it is ground and mixed evenly, and finally calcined in the air atmosphere, the calcination temperature is 1400 ℃, and the calcination time is 1 hour, get the trivalent dysprosium ion Dy 3+ Activated yellow phosphor.

[0038...

Embodiment 2

[0044] According to the chemical formula Ca 4.995 Dy 0.005 Nb 4 Ti 3 o 21 The stoichiometric ratio of each element in, respectively weighed calcium chloride CaCl 2 ::2.7722 g; Dy(NO 3 ) 3 ·6H 2 O: 0.0115 g; niobium pentachloride NbCl 5 : 5.4000 g; Titanium dioxide TiO 2 : 1.1981 grams is the raw material of preparation, the raw material that weighs is ground respectively, mixes uniformly; The mixture that obtains is pre-sintered under air atmosphere, and pre-sintering temperature is 1100 ℃, and pre-sintering time is 5 hours; Sintered sample grinds evenly, Calcined in an air atmosphere, the calcination temperature is 1200 ° C, and the calcination time is 15 hours, a trivalent dysprosium ion Dy 3+ Activated yellow phosphor.

[0045] The main structural properties, excitation spectrum, luminescence spectrum and luminescence lifetime spectrum of the sample are similar to those of Example 1.

Embodiment 3

[0047] According to the chemical formula Ca 4 wxya 4 Ti 3 o 21 The stoichiometric ratio of each element in is weighed respectively calcium oxide CaO: 1.1200 grams; dysprosium oxide Dy 2 o 3 : 0.9328 g; niobium pentoxide Nb 2 o 5 : 2.6580 g; Titanium dioxide TiO 2 : 1.1981 g is the raw material for preparation, the raw materials weighed are ground respectively and mixed uniformly; the mixture obtained is pre-sintered in an air atmosphere, the pre-sintering temperature is 1000 ° C, and the pre-sintering time is 8 hours; the sintered sample is ground evenly, Calcining again under air atmosphere, the calcination temperature is 1250°C, and the calcination time is 8 hours to obtain a trivalent dysprosium ion Dy 3+ Activated yellow phosphor.

[0048] The main structural properties, excitation spectrum, luminescence spectrum and luminescence lifetime spectrum of the sample are similar to those of Example 1.

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Abstract

The invention discloses a fluorescent material capable of emitting yellow light under near-ultraviolet excitation, and a preparation method and application thereof. The chemical formula of the material is Ca<5-5x>Dy<5x>Nb<4>Ti<3>O<21>, wherein x is a mol ratio of rare earth dysprosium ions Dy<3+> to substituted calcium ions Ca<2+>, and is no less than 0.0001 and no more than 0.20. The fluorescent material provided by the invention emits yellow light with a peak value at 574 nm or so in a near-ultraviolet area with exciting light in a range of 350 to 420 nm, and the chroma coordinate values of the luminescence of the material are that x is equal to 0.490 to 0.505 and y is equal to 0.490 to 0.485; and the excitation wavelength of the fluorescent material well matches with near-ultraviolet semiconductor chips like InAlGaN and InGaAs, and the fluorescent material can be used as a yellow component of multi-primary-color energy-saving fluorescence light source LEDs and WLEDs so as to modulate the color temperature of light sources and increase a color rendering index and is also applicable to a variety of other illumination equipment excited by ultraviolet light. The fluorescent material provided by the invention is stable in physical-chemical performance, high in luminous efficiency and free of toxicity and pollution. The preparation method directly carries out roasting in the air and is simple to operate, low in cost, free of any pollution and suitable for industrial production.

Description

technical field [0001] The invention relates to a fluorescent material that emits yellow light under near-ultraviolet excitation, a preparation method and an application, and belongs to the technical field of luminescent materials and displays. Background technique [0002] White LED is an emerging green lighting technology with strong development potential. Compared with incandescent lamps and fluorescent lamps, white LEDs have the advantages of small size, energy saving, long life, environmental protection, and easy preparation. White light is a mixture of multiple colors. The currently used white LEDs are mainly mixed with red phosphor and yellow phosphor, and combined with InGaN blue chip to obtain the white light that people need. [0003] Although some yellow phosphors have been developed, most of them are excited under ultraviolet light (less than 365 nanometers), which does not match the blue light chip (the excitation area is generally 380-470 nanometers), so it ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7703H01L33/504
Inventor 乔学斌
Owner NANJING TONGLI CRYSTAL MATERIALS RES INST CO LTD
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