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(Oxy) Nitride phosphor, white light-emitting device and method of preparing phosphor

A nitride phosphor, oxynitride technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems such as red phosphors that have not yet been developed

Inactive Publication Date: 2009-05-20
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, unstable materials are used as starting materials, therefore, the stringency of the conditions used to process the starting materials is increased
Likewise, red phosphors suitable for commercial production have not yet been developed

Method used

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  • (Oxy) Nitride phosphor, white light-emitting device and method of preparing phosphor
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  • (Oxy) Nitride phosphor, white light-emitting device and method of preparing phosphor

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Experimental program
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Embodiment approach

[0055] According to an exemplary embodiment, there is provided a white light emitting device including a UV-LED and the above-mentioned (oxy)nitride phosphor. The (oxy)nitride phosphor has pores.

[0056] The UV-LED is an excitation source emitting electromagnetic radiation in the ultraviolet or near ultraviolet region of the electromagnetic spectrum.

[0057] In the white light emitting device, the excitation wavelength of the UV-LED ranges from about 390 to about 460 nm.

[0058] According to an exemplary embodiment, the white light emitting device may further include at least one phosphor selected from blue phosphors, green phosphors, or a combination including at least one of blue phosphors or green phosphors.

[0059] The blue phosphor can be (Sr, Ba, Ca) 5 (PO 4 ) 3 Cl:Eu 2+ ;BaMg 2 al 16 o 27 :Eu 2+ ;Sr 4 al 14 o 25 :Eu 2+ ;BaAl 8 o 13 :Eu 2+ ;(Sr, Mg, Ca, Ba) 5 (PO 4 ) 3 Cl:Eu 2+ ; BaMgAl 10 o 17 : Eu 2+ ;Sr 2 Si 3 o 8 2SrCl 2 :Eu 2+ ; or a ...

Embodiment 1

[0114] 5.0g SrCO 3 and 0.06g Eu 2 o 3 Dissolve in 100cc 10% nitric acid, then add 4.0g Si to it 3 N 4 . This mixed solution was mixed with 4.8 g of citric acid, and the resulting solution was dried. The dried product was initially sintered at 700° C. for 1 hour in an air atmosphere. The sintered product was pulverized into powder using an agate mortar. This powder is made into a pellet. Put the pellets in the crucible, and put the crucible in the electric furnace. Pellets and carbon together in an electric furnace in NH 3 Heated under atmosphere up to 1100°C for 3 hours, then in 5% H 2 and 95% of N 2 Heated under atmosphere up to 1600°C for 5 hours. Carbon is included to avoid oxidation of the nitride starting material. The resulting sintered product is pulverized into powder, and the powder is washed with distilled water, and dried in an oven to obtain a powder having the formula ((Sr 0.99 Eu 0.01 ) 2 Si 5 N 8 ) phosphor sample 1.

Embodiment 2

[0116] Preparation in the same manner as in Example 1 has the formula ((Sr 0.98 Eu 0.02 ) 2 Si 5 N 8 ) of the phosphor sample 2, except that 5.0 g of SrCO will be used as the starting material 3 and 0.12g Eu 2 o 3 Dissolve in 100cc of 10% nitric acid.

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PUM

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Abstract

The invention provides an (oxy) nitride phosphor, a white light emitting device comprising the (oxy) nitride phosphor, a method for preparing the (oxy) nitride phosphor and the nitride phosphor prepared by the method. The (oxy)nitride phosphor is the compound represented by the formula 1; M is the alkaline-earth metal; furthermore x is more than 1 and less than 1; a is more than 1.8 and less than 2.2; b is more than 4.5 and less than 5.5; c is more than or equal to 0 and less than 8; d is more than 0 and less than or equal to 8; c+d is more than 0 and less than or equal to 8. The (oxy) nitride phosphor produces red light suitable for use in UV-LED and blue-LED type white light-emitting devices and achieves good efficiency.

Description

technical field [0001] The present invention relates to a (oxy)nitride phosphor, a white light emitting device comprising the (oxy)nitride phosphor, and a method for preparing the nitride phosphor. Background technique [0002] Conventionally, fluorescent lamps and incandescent lamps are widely used as light sources. However, mercury (Hg) used in fluorescent lamps causes environmental problems and thus is not satisfactory. Also, these conventional light sources are not suitable for energy saving due to their short lifetime and low efficiency. Therefore, many recent studies have been conducted to improve the efficiency of white light emitting devices. [0003] The white light emitting device can excite phosphors of three primary colors (red, green, and blue) by using a UV light-emitting diode (UV-LED) as a light source, excite red and green phosphors by using a blue LED as a light source, or by using a blue LED as a light source Excite the yellow phosphor to produce white ...

Claims

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Application Information

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IPC IPC(8): C09K11/79H01L33/00H01L33/54H01L33/56H01L33/60H01L33/62
CPCH01L2224/49107H01L2224/48257H01L2224/45144H01L2224/48091H01L2224/73265H01L2224/32245Y02B20/181H01L2224/48247H01L2924/00014H01L2924/00C09K11/71
Inventor 窪田俊一金泳植任承宰金泰坤
Owner SAMSUNG ELECTRO MECHANICS CO LTD
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