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Method for preparing single crystal wide-band gradient LED phosphor

A phosphor and gradient technology, which is applied in the field of LED solid-state lighting systems, can solve problems affecting the photoelectric conversion rate of broad-spectrum gradient phosphor quality and industrial production, application limitations, and difficulty in controlling the size of single crystal grains.

Inactive Publication Date: 2018-03-13
HUNAN SCI & TECH RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent specification CN103254901A discloses a kind of broadband gradient LED fluorescent powder and its preparation method, finds in the implementation process, the success rate of the manufacture of its micron-sized single crystal grain (seed crystal) is not high, single crystal grain (crystal seed) species) size is difficult to control
This shortcoming affects the quality and industrial production of wide-spectrum gradient phosphors with high photoelectric conversion rate and high color rendering index, and limits its application.

Method used

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  • Method for preparing single crystal wide-band gradient LED phosphor
  • Method for preparing single crystal wide-band gradient LED phosphor
  • Method for preparing single crystal wide-band gradient LED phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The present invention will be further described below in conjunction with the preparation of YAG series broadband gradient phosphors.

[0082] 1. The raw materials and reagents used in this example are as follows:

[0083] Yttrium oxide (Y 2 o 3 ≥99.99%) or yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O≥99.99%); cerium nitrate (Ce(NO) 3 ·6H 2 O, analytically pure); aluminum nitrate (Al(NO 3 ) 3 9H 2 O, analytically pure); gallium nitrate (Ga(NO 3 ) 3 9H 2 O, analytically pure), gadolinium nitrate (Gd(NO 3 ) 3 ·6H 2 O, analytically pure), concentrated nitric acid HNO 3 , analytically pure; absolute ethanol, C 2 h 5 OH, analytically pure; distilled water H 2 O; ammonium bicarbonate (NH 4 HCO 3 , analytically pure); ammonia water (NH 3 ·H 2 O, analytically pure); polyethylene glycol (PEG1000). 2. The experimental equipment used in this embodiment is as follows:

[0084]Conventional glass apparatus; dryer; pure water system; fully automatic electronic analytica...

Embodiment 2

[0130] BSS-A, BSS-B series broadband gradient phosphor preparation process such as Figure 7 and Figure 8 Shown:

[0131] 1 Raw materials and reagents:

[0132] Barium oxide (BaO≥99.99%) or barium nitrate (Ba(NO 3 ) 2 ≥99.99%); strontium oxide (SrO≥99.99%) or strontium nitrate (Sr(NO 3 ) 2 ≥99.99%); europium nitrate (Eu(NO 3 ) 3 6H2O, analytically pure); ethyl orthosilicate (Si(OC 2 h 5 ) 4 , analytically pure); concentrated nitric acid HNO 3 , analytically pure; absolute ethanol, C 2 h 5 OH, analytically pure; distilled water H 2 O; ammonium bicarbonate (NH 4 HCO 3 , analytically pure); ammonia water (NH 3 ·H 2 O, analytically pure); polyethylene glycol (PEG1000)

[0133] 2 experimental equipment

[0134] Conventional glass apparatus; dryer; pure water system; fully automatic electronic analytical balance; constant temperature magnetic stirrer; electric heating constant temperature water tank; pH acidity meter; Drying box; agate mortar; high-temperature g...

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Abstract

The invention relates to a method for preparing single crystal wide-band gradient LED phosphor. The method comprises preparing multiple types of pure-phase nanometer fluorescent powder with the same crystal structure and different compositions through a homogenous precipitation method, adding a dispersant, an adhesive and a fluxing agent into the nanometer fluorescent powder, preparing size-controllable spherical particles with different sizes through a granulation method, preparing spherical nano-aggregates with mesoporous structures through a rapid sintering process, carrying out sintering at a high temperature to obtain size-controllable single-crystal phosphor seed crystals, mixing micron-level phosphor crystals as seeds and the pure-phase nanometer fluorescent materials with the samestructure and different compositions, and orderly carrying out epitaxial growth at a high temperature step by step to obtain wide-band gradient LED phosphor. The wide-band gradient LED phosphor has controllable sizes, good dispersity, complete crystal lattice, high packing density, emission frequency wider than that of general phosphor, large scattering intensity and high luminous efficiency.

Description

technical field [0001] The invention relates to an LED solid-state lighting system and its application, in particular to a manufacturing method of a single crystal grain LED broadband gradient fluorescent powder. Background technique [0002] Since Nick Holonyak Jr. of General Electric Company developed the first practical visible light-emitting diode LED in 1962, especially the breakthrough of the third-generation semiconductor material GaN technology in the late 1990s triggered Since the third revolution in the field of lighting, after 50 years of development, LED has small size, high brightness, low power consumption (1 / 8 to 1 / 10 of incandescent bulbs, 1 / 2 of energy-saving fluorescent lamps), long life Long (more than 120,000 hours), high efficiency, low heat, environmental protection (no Hg, Pb and other pollution), low-voltage low-current start-up, fast response, shock and impact resistance, planar packaging, easy to develop into ultra-thin and short products and other ...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/80C09K11/59C30B1/02C30B29/28
CPCC09K11/02C09K11/7734C09K11/7774C30B1/023C30B29/28
Inventor 李廷凯李晴风陈建国张拥军唐冬汉谭丽霞李勇虞爱民
Owner HUNAN SCI & TECH RES & DEV CENT
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