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Red phosphor powder used for white light LED and preparing method thereof

A technology of red phosphor and white light, which is applied in the field of rare earth luminescent materials, can solve the problem of high cost and achieve the effect of good matching, cost reduction and high color purity

Inactive Publication Date: 2010-06-09
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For prior art molybdate red phosphor must be doped with high concentration Eu 3+ Ion (> 20mol%) can obtain stronger red light emission, so the problem of higher cost, the present invention provides a kind of red fluorescent powder for white light LED and preparation method thereof, introduces appropriate concentration Bi into the molybdate system 3+ , forming a stable solid solution at a lower temperature using the high-temperature solid-state method

Method used

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  • Red phosphor powder used for white light LED and preparing method thereof
  • Red phosphor powder used for white light LED and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0016] Weigh K according to the molar ratio: K: Ca: Bi: Eu: Mo = 0.20: 0.55: 0.20: 0.05: 1 2 CO 3 , CaO, Bi 2 o 3 、Eu 2 o 3 、MoO 3 The raw materials are fully ground and mixed in an agate mortar, put into an alumina crucible, covered, sintered in a muffle furnace at 550°C for 6 hours, cooled and then ground; then secondly sintered at 800°C for 5 hours, cooled and ground Promptly obtain a kind of red fluorescent powder of the present invention, chemical composition is: K 0.20 Ca 0.55 Bi 0.20 Eu 0.0 5(MoO 4 ), where x=0.20, y=0.20, z=0.05.

Embodiment 2

[0018] According to the molar ratio: K: Ca: Bi: Eu: Mo = 0.15: 0.60: 0.15: 0.10: 1 Weigh the raw material KHCO 3 , CaO, Bi 2 o 3 、Eu 2 o 3 、MoO 3 , other steps are with embodiment 1, obtain a kind of red fluorescent powder of the present invention, chemical composition is: K 0.15 Ca 0.6 Bi 0.15 Eu 0.10 (MoO 4 ) where x=0.15, y=0.15, z=0.10.

Embodiment 3

[0020] According to the molar ratio: Ca: Bi: Eu: Mo = 0.75: 0.20: 0.05: 1, weigh the raw materials CaO and Bi 2 o 3 、Eu 2 o 3 、MoO 3 , after fully grinding and mixing in an agate mortar, put it into an alumina crucible, cover it, sinter in a muffle furnace at 500°C for 8 hours, cool and grind; then sinter at 850°C for 2 hours to obtain the present invention A kind of red phosphor, the chemical composition is: Ca 0.75 Bi 0.20 Eu 0.05 (MoO 4 ), where x=0, y=0.20, z=0.05.

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Abstract

The invention relates to phosphor powder used for a white light LED, and belongs to the rare earth luminescent material technical field; the general formula of the chemical component is (AxM1-x-y-z<Bi><y><Eu><z>) MoO4, wherein, A is anyone or the combination of the two of Li, Na and K; M is anyone or the combination of the two of Mg, Ca, Sr and Ba, x is more than or equal to 0 and less than or equal to 1.0, y is more than 0 and less than 1.0, z is more than 0 or less than 1.0. The preparation method of the phosphor powder includes the following steps: raw material is accurately taken accordingto the stoichiometric proportion of the chemical component of a general formula, and fully porphyrized and mixed uniformly, and sintered for 2 to 8 hours under the temperature of 500 to 900 DEG C, and grinded after being cooled; the raw material are sintered for 1 to 8 hours under the temperature of 700 to 900 DEG C, and grinded after being cooled. The phosphor powder related by the invention iswell matched with near ultraviolet and blue light LED chip dies, the color purity is high, and the phosphor powder can be used for the white light LED and other lightening fields.

Description

Technical field: [0001] The invention belongs to the technical field of rare earth luminescent materials, and relates to a red phosphor material for white LEDs and a preparation method thereof. Background technique: [0002] Since the 1990s, white LEDs based on GaN chips have developed rapidly. Currently, the chips used for white LEDs include near-ultraviolet GaN chips (around 400nm) and blue-light GaN chips (around 465nm). However, the effective excitation range of existing red phosphors is mostly in the short-wave UV radiation band, and the near-ultraviolet and blue light excitation efficiencies are relatively low. Y.Hu et al. reported in the journal Journal of Alloys and Compounds (390, 226-229, 2005) a molybdate red phosphor that can be effectively excited by near-ultraviolet GaN chips: Ca 1-x Eu x MoO 4 . However, the prerequisite for obtaining strong red emission in this material is that it must be doped with a high concentration of Eu 3+ Ions (>20mol%), so the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/00H01L33/50
CPCY02B20/181Y02B20/00
Inventor 张家骅闫素霞张霞
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI