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White LED light source and manufacturing method of phosphor thereof

A technology of LED light source and phosphor, applied in the direction of light source, electric light source, optical element for changing the spectral characteristics of emitted light, etc. The problem of uneven thickness of the phosphor coating layer, etc., achieves the effects of stable luminous performance, low cost, and good mechanical properties.

Inactive Publication Date: 2011-07-13
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) Phosphor powder has obvious light decay, which causes white light to drift easily;
[0006] (2) The currently widely used phosphor coating process is manual dispensing coating, which is likely to cause uneven thickness of the phosphor coating layer, directly affects the uniformity of light output, and increases the complexity of the process;
[0007] (3) The rare earth luminescent centers commonly used in phosphors are mainly limited to Eu 2+ and Ce 3+ , their transitions in the blue light region are broadband f-d transitions, while other trivalent rare earth ions are narrow-band f-f transitions in the blue light region, which is not conducive to obtaining fluorescence emission with high external quantum efficiency, thus limiting the types of rare earth ions that can be selected;
[0008] (4) The epoxy resin material used for encapsulation has poor UV radiation resistance and temperature stability, which causes white LEDs to age easily and seriously reduces the service life of white LED light sources

Method used

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  • White LED light source and manufacturing method of phosphor thereof
  • White LED light source and manufacturing method of phosphor thereof
  • White LED light source and manufacturing method of phosphor thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The preparation method of phosphor 2 using borate as the parent body, its components and mole percentages are:

[0068] B 2 o 3 -30mol%,

[0069] ZnO-38mol%,

[0070] P 2 o 5 -30mol%,

[0071] AgNO 3 The doping amount is 2mol%.

[0072] First weigh B according to the above chemical dosage ratio 2 o 3 , P 2 o 5 , ZnO and AgNO 3 raw materials, and grind to mix well. Put the uniformly mixed raw materials into a corundum crucible, heat at 1100°C and keep the temperature constant for 30 minutes, pour the molten liquid onto the preheated copper mold, and after forming primary glass, anneal in an electric furnace at 550°C for 10-60 minutes respectively, then it can be Metallic silver nanoparticles are grown in the glass, and the number and particle size of the generated metallic silver nanoparticles can be adjusted by changing the annealing time. Finally, the final glass obtained is cut and polished to a size of 10×10×1mm 3 sample. Such as figure 2 Shown is the...

Embodiment 2

[0075] The preparation method of phosphor 2 using germanate as the matrix, its components and molar percentages are:

[0076] GeO 2 -60mol%,

[0077] PbO-20mol%,

[0078] BaO-10mol%,

[0079] K 2 O-9.8mol%,

[0080] AgNO 3 The doping amount is 0.2mol%.

[0081] First weigh GeO according to the above chemical dosage ratio 2 , PbO, BaO, K 2 CO 3 and AgNO 3 raw materials, and grind to mix well. Put the uniformly mixed raw materials into a corundum crucible, heat at ~1100°C and keep the temperature constant for 30 minutes, pour the molten liquid onto the preheated copper mold to form primary glass, anneal in an electric furnace at 450°C to grow metallic silver nanoparticles, Finally the resulting final glass is cut and polished to make 10×10×1mm 3 sample. The results of the absorption spectrum test show that the sample has a strong metallic silver nanoparticle plasmon resonance absorption peak at around 450nm in the blue light band. By changing GeO 2 , PbO, BaO and ...

Embodiment 3

[0084] The preparation method of phosphor 2 using borate as the parent body, its components and mole percentages are:

[0085] B 2 o 3 -80mol%,

[0086] ZnO-10mol%,

[0087] Na 2 O-9.8mol%,

[0088] AgNO 3 The doping amount is 0.2mol%.

[0089] First weigh B according to the above chemical dosage ratio 2 o 3 , ZnO, Na 2 CO 3 and AgNO 3 raw materials, and grind to mix well. Put the uniformly mixed raw materials into a corundum crucible, heat at ~1100°C and keep the temperature constant for 30 minutes, pour the molten liquid into the preheated copper mold to form primary glass, and then anneal in an electric furnace at 450°C to grow metallic silver nanoparticles , and finally cut and polish the resulting final glass to make 10×10×1mm 3 sample. The results of the absorption spectrum test show that the sample has a strong metal silver nanoparticle plasmon resonance absorption peak at around 420nm in the blue light band. by changing B 2 o 3 , ZnO and Na 2 The rati...

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Abstract

The invention discloses a white LED light source and a manufacturing method of a phosphor thereof. The light source comprises a blue LED and a phosphor, wherein the phosphor is a rare-earth ion doped glass body containing metal nano particles. In the invention, germinate and borate or tellurate are used as matrixes, AgNO3 is used as a raw material, silver is added into glass; the growth of metal silver nano particles is realized through a heat treatment process; Eu<3+>, Sm<3+> or Pr<3+> is used as a red emitting and doping center, and Tb<3+>, Er<3+> or Ho<3+> is used as a green emitting and doping center; and the ions are singly doped or jointly doped into a glass matrix to match with the blue LED chip to emit out white light. In the invention, a single glass phosphor is used for replacing a traditional white LED fluorescent powder and a packaging material, thus the packaging process can be simplified; the ageing problem of a white LED device can be solved, and the stability of the device can be improved; and the excitation efficiency of rare-earth ions can be improved so as to realize high-brightness fluorescence-emission.

Description

technical field [0001] The invention belongs to the technical field of LED light sources and rare earth luminescent materials thereof, and in particular relates to a preparation method of white light LED light sources and phosphors thereof. Background technique [0002] In the face of the increasingly tense energy crisis in the world, the development of new, environmentally friendly and energy-saving lighting equipment has become a topic of widespread concern. Solid-state lighting based on white light-emitting diodes (Light Emitting Diode, LED) has many advantages such as energy saving, environmental protection, stability and long life, and will become another leap in the history of human lighting after incandescent lamps and fluorescent lamps. The development of solid-state lighting dominated by white LEDs is of great significance to alleviating the energy crisis and building a resource-saving and harmonious society. [0003] At present, there are three main schemes for re...

Claims

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Application Information

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IPC IPC(8): F21S2/00F21V9/10C09K11/70C09K11/66C09K11/63F21K9/20F21K9/64F21V9/40F21Y115/10
CPCY02B20/181Y02B20/00
Inventor 李香萍陈宝玖仲海洋程丽红孙佳石张金苏
Owner DALIAN MARITIME UNIVERSITY
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