Green fluorescent powder for LED and preparation method of green fluorescent powder

A green phosphor, phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of poor matching and low luminous intensity, and achieve the effect of good matching and high commercial application value

Inactive Publication Date: 2018-04-24
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used RGB phosphors are mainly Y 2 o 2 S: Eu 2+ , BaMgAl 10 o 17 : Eu 2+ , ZnS:Cu + , Al 3+ etc., but the green powder system used mainly includes orthosilicate, nitride, sulfide, aluminate and halosilicate, and the prepared green phosphor has poor matching with the purple chip and low luminous intensity. Shortcomings

Method used

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  • Green fluorescent powder for LED and preparation method of green fluorescent powder

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Effect test

Embodiment 1

[0017] Weigh 7.93mol CaCO according to the general chemical formula 3 , 1.5mol La 2 o 3 , 3mol SiO 2 , 3mol NH 4 h 2 PO 4 , 0.035mol Eu 2 o 3 , as a raw material, put the raw material in a ball mill jar, mix evenly, and ball mill for 6 hours at a ball milling speed of 125 rpm, then in N 2 / H 2 Calcined under the reducing atmosphere created by the mixed gas, where N 2 and H 2 The flow ratio is 9:1, the calcination temperature is 1350°C, and the calcination time is 6 hours. After the calcination, the material is taken out, cooled and pulverized, and ground and sieved to obtain the required Ca 7.93 La 3 (SiO 4 ) 3 (PO 4 ) 3 o 2 : 0.07Eu 2+ Green phosphor material.

Embodiment 2

[0019] Weigh 7.999mol SrCO according to the general chemical formula 3 , 1.5mol La 2 o 3 , 3mol SiO 2 , 3molNH 4 h 2 PO 4 , 0.0005mol Eu 2 o 3 , as a raw material, put the raw material in a ball mill jar, mix evenly, and ball mill for 5 hours at a ball milling speed of 160 rpm, then in N 2 / H 2 Calcined under the reducing atmosphere created by the mixed gas, where N 2 and H 2 The flow ratio is 10:1, the calcination temperature is 1450°C, and the calcination time is 7 hours. After the calcination, the material is taken out, cooled and pulverized, and ground and sieved to obtain the required Sr 7.999 La 3 (SiO 4 ) 3 (PO 4 ) 3 o 2 : 0.001Eu 2+ Green phosphor material.

Embodiment 3

[0021] Weigh 7.5mol BaCO according to the general chemical formula 3 , 1.5mol La 2 o 3 , 3mol SiO 2 , 3mol NH 4 h 2 PO 4 , 0.25mol Eu 2 o 3 , as a raw material, put the raw material in a ball mill jar, mix evenly, and ball mill for 10 hours at a ball milling speed of 110 rpm, then in N 2 / H 2 Calcined under the reducing atmosphere created by the mixed gas, where N 2 and H 2 The flow ratio is 8:1, the calcination temperature is 1200°C, and the calcination time is 9 hours. After the calcination, the material is taken out, cooled and pulverized, and ground and sieved to obtain the desired Ba 7.5 La 3 (SiO 4 ) 3 (PO 4 ) 3 o 2 : 0.5Eu 2+ Green phosphor material.

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Abstract

The invention discloses green fluorescent powder for LED and a preparation method of the green fluorescent powder. The chemical formula of the green fluorescent powder for LED is M8-xLa3(SiO4)3(PO4)3O2: xEu2+ (M is one of Ca, Sr and Ba, and x is greater than or equal to 0.001 and less than or equal to 0.5). The green fluorescent powder takes M8-xLa3(SiO4)3(PO4)3O2 as a matrix, and is doped with Eu2+. A high-temperature solid-phase method is mainly used for preparing the green fluorescent powder and comprises the following specific steps: weighing required raw materials according to stoichiometric ratio; ball-milling and mixing uniformly; then calcining the raw materials in a reducing atmosphere provided by N2/H2; and cooling and pulverizing, and grinding and sieving to obtain the requiredfluorescent powder. The prepared fluorescent powder powerfully absorbs light in a spectral region of 300-400 nm, and the peak position of a transmitting spectrum is positioned in a green light spectrum range of 495-545 nm. The green fluorescent powder for LED has the advantages of wide exiting and transmitting light spectrum range and high luminous strength.

Description

technical field [0001] The invention relates to a green fluorescent powder for LED, provides a preparation method of the fluorescent powder, and belongs to the field of rare earth luminescent materials. Background technique [0002] White LED lighting is recognized as the fourth-generation lighting product because of its advantages such as high luminous efficiency, long life, energy saving and environmental protection, safety and reliability, and has shown great application potential and development in the fields of indoor and outdoor lighting, backlight, and special lighting. prospect. At present, the main way to realize white LED lighting is to excite YAG yellow phosphor powder with blue LED chips. This method has the advantages of simple operation and low cost, but its disadvantages are the low color rendering index and low light quality of the prepared white LED. People's requirements for high-quality light, this method obviously cannot satisfy everyone. In recent year...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81
CPCC09K11/7796
Inventor 张娜朱月华卓宁泽蒋利华王海波
Owner NANJING UNIV OF TECH
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