High-color-purity red luminescent material for blue light excitation and preparation method of red luminescent material

A technology of red light emission and blue light excitation, applied in the direction of light-emitting materials, chemical instruments and methods, etc., can solve the problems of low luminous efficiency, low absorption efficiency, low luminous efficiency of red phosphor powder, etc.

Inactive Publication Date: 2015-02-18
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the red phosphors currently suitable for blue LED chips have low luminous efficiency because of their low absorption efficiency in the blue region
For example, Eu-doped 3+ series red phosphor...

Method used

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  • High-color-purity red luminescent material for blue light excitation and preparation method of red luminescent material
  • High-color-purity red luminescent material for blue light excitation and preparation method of red luminescent material
  • High-color-purity red luminescent material for blue light excitation and preparation method of red luminescent material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh barium carbonate (BaCO 3 ): 0.996 g, germanium oxide (GeO2): 0.523 g, potassium permanganate (KMnO 4 ): 0.063g, then add 5 mL (40 %) hydrofluoric acid (HF) to the above solid mixture and stir to dissolve, then add 45 mL of distilled water. Then the resulting solution was reacted in an autoclave at 180°C for 12 hours, cooled to room temperature, washed with distilled water, and then dried in a vacuum oven for 24 hours. The final pink powder obtained was the final BaGeF 6 :Mn 4+ Phosphor.

[0015] The XRD diffraction pattern of this fluorescent powder is attached figure 1 shown, with the standard card JCPDS 74-0924 (BaGeF 6 ) in contrast, the two are completely consistent, and no diffraction peaks of any heterogeneous phases are observed, which indicates that the samples we synthesized have a single crystal phase.

[0016] attached figure 2 Shown are the room temperature excitation spectrum (monitored at 634 nm) and emission spectrum (excited at 460 nm) of th...

Embodiment 2

[0019] Weigh barium carbonate (BaCO 3 ): 0.996 g, germanium oxide (GeO 2 ): 0.523 g, potassium permanganate (KMnO 4 ): 0.063g, then add 10 mL (40 %) hydrofluoric acid (HF) to the above solid mixture and stir to dissolve, then add 40 mL of distilled water. Subsequently, the resulting solution was reacted in an autoclave at 180°C for 8 hours, cooled to room temperature, washed with distilled water, and then dried in a vacuum oven for 24 hours. Finally, the pink powder obtained was the final BaGeF 6 :Mn 4+Phosphor.

Embodiment 3

[0021] Weigh barium carbonate (BaCO 3 ): 0.996 g, germanium oxide (GeO 2 ): 0.523 g, potassium permanganate (KMnO 4 ): 0.033 g, then add 10 mL (40%) hydrofluoric acid (HF) to the above solid mixture and stir to dissolve, then add 40 mL of distilled water. Subsequently, the resulting solution was reacted in an autoclave at 180°C for 8 hours, cooled to room temperature, washed with distilled water, and then dried in a vacuum oven for 24 hours. Finally, the pink powder obtained was the final BaGeF 6 :Mn 4+ Phosphor.

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Abstract

The invention relates to the field of white light emitting diode, and discloses a preparation method of a high-color-purity red luminescent material for blue light excitation. The high-color-purity red luminescent material for blue light excitation comprises the following chemical constitutions: M<II>Ge(1-x)F6:xMn<4+>, wherein M<II> is selected from one or more of alkaline earth metal ions Ba<2+>, Sr<2+>, Ca<2+> and Mg<2+>; x is a molar percentage coefficient of the correspondingly doped Mn<4+> to Ge<4+> ions; x is larger than or equal to 0 and smaller than or equal to 0.10. The high-color-purity red luminescent material for blue light excitation is prepared with a hydrothermal method. The red florescent powder can be excited by blue light to irradiate 634 nm of red light with the high luminous efficiency and the good color purity.

Description

technical field [0001] The present invention relates to a high-color-purity red luminescent material suitable for blue light excitation and a preparation method thereof, in particular to a red luminescent material for a blue light semiconductor chip (LED) and a preparation method thereof. It belongs to the field of preparation of inorganic functional materials. Background technique [0002] Compared with traditional lighting technologies (such as incandescent lamps, fluorescent lamps, etc.), white light-emitting diode (W-LED, white-light-emitting diode) solid-state lighting has the advantages of energy saving, high luminous efficiency, wide applicability, good stability, and environmental friendliness. Many advantages, has become a research hotspot. At present, commercialized white LEDs still use the blue light (about 460 nm) emitted by GaN-based LED chips to excite the yellow rare earth phosphor YAG:Ce 3+ White light is obtained by compounding, but this type of white LED ...

Claims

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Application Information

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IPC IPC(8): C09K11/66
Inventor 汪正良周强周亚运刘永杨慧郭俊明袁明龙
Owner YUNNAN MINZU UNIV
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