LED (light-emitting diode) fluorescent powder with broadband gradient and preparation method thereof
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A phosphor, broadband technology, applied in the field of LED solid-state lighting system
Inactive Publication Date: 2013-08-21
HUNAN SCI & TECH RES & DEV CENT
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[0007] Table 1 Comparison of advantages and disadvantages of phosphor powder preparation methods
Method used
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Embodiment 1
[0092] Example 1 Preparation of YAG series broadband gradient phosphor powder
[0093] 1. Raw materials and reagents:
[0094] 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)
[0095] 2. Experimental equipment
[0096] 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 ...
Embodiment 2
[0142] BSS–A, BSS-B series broadband gradient phosphor preparation process such as Figure 7 and Figure 8 Shown:
[0143] 1 Raw materials and reagents:
[0144] 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)
[0145] 2 experimental equipment
[0146] 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 provides an LED (light-emitting diode) fluorescent powder with broadband gradient and a preparation method thereof. A single particle of the fluorescent powder sequentially comprises more than three layers of fluorescent materials with the same crystal structure and different chemical components from inside to outside. According to the preparation method, a microwave heating-homogeneous precipitation technology is adopted for preparing several pure phase micro nanoscale or nanoscale fluorescent powders with the same crystal structure and different components, and then the micro-sized fluorescent powder grain is taken as a seed crystal, the micro-sized fluorescent powder grain is mixed with the pure phase micro nanoscale or nanoscale fluorescent powder, epitaxial growth is conducted sequentially step by step at high temperature, or the micro-sized fluorescent power grain is taken as a seed crystal, a mononuclear multilayered shell structure precursor with the same crystal structure and different components is formed through liquid phase coprecipitation, epitaxial growth is conducted sequentially step by step at high temperature, and then the LED fluorescent powder with broadband gradient is obtained through grinding. The LED fluorescent powder with broadband gradient has a special structure and components, good dispersibility, high bulk density, strong 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 broadband gradient LED fluorescent powder and a preparation method thereof. Background technique [0002] Due to its small size, high brightness, low power consumption (1 / 8 to 1 / 10 of incandescent bulbs, 1 / 2 of energy-saving fluorescent lamps), long life (more than 120,000 hours), high efficiency, low heat, and environmental protection ( No Hg, Pb and other pollution), can start at low voltage and low current, fast response, shock resistance, planar packaging, easy to develop into ultra-thin and short products and other advantages. It has experienced 50 years of development since its invention and is widely used in construction. Landscape lighting, large-screen display, traffic lights, indicator lights, large and small backlights for TVs, mobile phones and digital cameras, solar LED lighting, automotive lighting, special lighting and military and many ot...
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