Metal silicon-based nitrogen oxide fluorescent powder and preparation method thereof

A nitrogen oxide and phosphor technology, applied in the field of rare earth luminescent materials, can solve problems such as the condition of excellent light source, color temperature change, color temperature rise, etc., and achieve the advantages of industrialized large-scale production, improved luminous intensity and performance, and low cost. Effect

Inactive Publication Date: 2013-03-20
CHONGQING ACADEMY OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the white light emitted by white LEDs is all cool white light, and the solubility requirements for dopant ions are also very strict. In order to convert this cold white light into warm white light, the existing technology uses a mixture of two or more types o

Method used

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  • Metal silicon-based nitrogen oxide fluorescent powder and preparation method thereof
  • Metal silicon-based nitrogen oxide fluorescent powder and preparation method thereof
  • Metal silicon-based nitrogen oxide fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1 Prepare Sr 0.98 Si 2 O 2 N 2 :0.02Eu 2+ Phosphor

[0035] Weigh 4.3403g SrCO 3 (AR), 2.8056g Si 3 N 4 (Purity> 95%) and 0.1056g Eu 2 O 3 (Purity> 99.99%), put it in a zirconia ball mill tank after mixing, add zirconia balls and an appropriate amount of ball milling medium, the total amount of samples should not exceed 2 / 3 of the ball mill tank, ball mill on a planetary ball mill for 3 hours; put the ground sample in Put it into the drying box and dry it at 100℃ for 4h; put the dried powder in the atmosphere furnace, and fill it with N 2 / H 2 The mixed gas is circulated, the roasting temperature is 1300℃, and the roasting time is 5 hours; as the furnace is cooled, the sample is taken out and sieved, and the spectrum is tested as figure 1 Shown.

[0036] Such as figure 1 The phosphor shown can be effectively excited by ultraviolet, near ultraviolet light and blue light in the range of 250-500 nm to emit green light with a main peak wavelength of about 541 nm.

Example Embodiment

[0037] Example 2 Prepare Sr 0.96 Si 2 O 2 N 2 :0.04Eu 2+ Phosphor

[0038] Weigh 4.2517g SrCO 3 (AR), 2.8056g Si 3 N 4 (Purity> 95%) and 0.2112g Eu 2 O 3 (Purity> 99.99%), put it in a zirconia ball milling tank after mixing, add zirconia balls and a proper amount of ball milling medium, the total amount of the sample cannot exceed 2 / 3 of the ball milling tank, ball mill on a drum ball mill for 3 hours; put the ground sample in Put it into the drying box and dry it at 100℃ for 4h; put the dried powder in the atmosphere furnace, and fill it with N 2 / H 2 The mixed gas is circulated, the roasting temperature is 1500℃, and the roasting time is 2 hours; as the furnace cools, the sample is taken out and sieved, and the spectrum is tested as figure 2 Shown.

[0039] Such as figure 2 The phosphor shown can be effectively excited by ultraviolet, near ultraviolet light and blue light in the range of 250-500nm to emit green light with a main peak wavelength of about 547nm.

Example Embodiment

[0040] Example 3 Prepare Sr 0.98 Si 2 O 2 N 2 :0.02Eu 2+ Phosphor

[0041] Step 1: Weigh 4.3403g SrCO 3 (AR), 0.1056g Eu 2 O 3 (Purity> 99.99%), put it in a zirconia ball mill tank after mixing, add zirconia balls and an appropriate amount of ball milling medium, the total sample cannot exceed 2 / 3 of the ball mill tank, ball mill on a planetary ball mill for 3 hours to make SrCO 3 And Eu 2 O 3 Fully mix to form the first mixture; put the ground first mixture into a drying oven at 100°C for 4 hours; put the dried powder in an atmosphere furnace, and charge it with N 2 / H 2 The mixed gas is circulated, the roasting temperature is 1000°C, and the roasting time is 6 hours; after the furnace is cooled, the sample is taken out and ground and sieved with a 100-mesh standard inspection sieve, which is the mesophase silicate, and the spectrum of the mesophase silicate is tested ;

[0042] Step 2: Weigh 2.8056g Si 3 N 4 (Purity> 95%), then Si 3 N 4 Mix with the mesophase silicate obtained i...

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Abstract

The invention discloses metal silicon-based nitrogen oxide fluorescent powder and a preparation method thereof. The fluorescent powder is as shown in the general formula: M[1-x]Si2O2N2:xEu<2+>, wherein x is larger than 0 and smaller than 0.06, and M is one element or multiple elements selected from Ca, Sr and Ba. The fluorescent powder is wide in excitation range, stable in chemical and thermal properties and good in light-emitting effect; and the bathochromic shift of the peak of an emission spectrum appears along with the increment of the concentration of active ions. The invention also discloses a preparation method of the fluorescent powder, comprising the following steps of: generating silicate as an intermediate phase firstly, and then, generating a final product. The preparation method has the advantages that raw materials are simple, cost is low, operation is simple and easy, preparation temperature is low, equipment requirement is low and the like, and is capable of saving energy source and beneficial for large-scale industrial production; and the light-emitting performance of the fluorescent powder prepared by using the method is remarkably higher as compared with the traditional solid-phase one-step reaction method.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to metal silicon-based nitrogen oxide fluorescent powder for warm white LEDs and a preparation method thereof. [0002] Background technique [0003] White LED has the advantages of high efficiency, energy saving, environmental protection, stable and reliable performance, and long service life. Its development will replace traditional lighting technology. Therefore, exploring new phosphors for white LEDs that can be excited by blue chips or ultraviolet light has become the current LED research hotspots. [0004] White LEDs are made of InGaN blue LED chips coated with Ce 3+ Activated yttrium aluminum garnet (Y 3 Al 5 o 12 , referred to as YAG: Ce 3+ ) composed of yellow phosphor powder, this white LED is a new type of solid-state lighting electric light source, which uses the blue light emitted by the blue LED chip to excite YAG: Ce 3+ Yell...

Claims

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Application Information

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IPC IPC(8): C09K11/59
Inventor 李海利张娜文波张偌雨卞先彬
Owner CHONGQING ACADEMY OF SCI & TECH
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