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Preparation method of broadband gradient LED (Light-emitting Diode) fluorescent film

A gradient, broadband technology applied in the field of LED solid-state lighting systems

Inactive Publication Date: 2013-08-14
HUNAN SCI & TECH RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Table 1 Comparison of advantages and disadvantages of phosphor powder preparation methods

Method used

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  • Preparation method of broadband gradient LED (Light-emitting Diode) fluorescent film
  • Preparation method of broadband gradient LED (Light-emitting Diode) fluorescent film
  • Preparation method of broadband gradient LED (Light-emitting Diode) fluorescent film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Example 1 Preparation of YAG series broadband gradient phosphor powder

[0113] 1. Raw materials and reagents:

[0114] 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)

[0115] 2. Experimental equipment

[0116] 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

[0163] BSS–A, BSS-B series broadband gradient phosphor preparation process such as Figure 7 and Figure 8 Shown:

[0164] 1 Raw materials and reagents:

[0165] 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)

[0166] 2 experimental equipment

[0167] 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...

Embodiment 3

[0186] Embodiment 3: the preparation method of LED broadband fluorescent film, such as Figure 18 As shown, the film can be directly coated on the LED chip; Figure 19 As shown, it can also be directly coated on the LED lampshade.

[0187] 1. The technical process of preparing YAG series fluorescent thin films by suspension method is as follows: Figure 20 As shown, the specific steps are as follows:

[0188] 1.1 Pour any YAG series phosphor powder prepared in Example 1 into methanol (METHANOL) or xylene (XYLENE) or 2-ethylhexanoic acid (2-ETHLHEXANOIC ACID) or their mixture to form Suspension with a mass concentration of about 5%;

[0189] 1.2 Preparation of YAG:Ce from the suspension 3+ Fluorescent film; directly deposit YAG:Ce on the LED chip or on the LED lampshade by the suspension coating method 3+ fluorescent film;

[0190] 1.3 Dry the prepared film, and heat-treat it in a hydrogen atmosphere at 380°C-420°C for 1-10 minutes to form a dense film of 5-30μm. This th...

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Abstract

The invention provides a preparation method of a broadband gradient LED (Light-emitting Diode) fluorescent film. The preparation method is characterized in that broadband gradient LED fluorescent powder serves as a raw material; a uniform multicolour (red, green, blue and the like) fluorescent material film is deposited on an LED device or an LED lampshade gasket by a suspension method or a sol-gel method; and the broadband gradient LED fluorescent film prepared by the method has uniform isotropic color temperatures. The preparation method can be used for manufacturing and massively producing high-performance white LEDs with same performance, and can be used for preparing white LED devices, which can emit light approximating to sunlight, with high photoelectric conversion rates and high color rendering indexes. The broadband gradient LED fluorescent powder has a special structure and composition, and is good in dispersity, high in stacking density, great in scattering intensity and high in light-emitting efficiency.

Description

technical field [0001] The invention relates to an LED solid-state lighting system and its application, in particular to the design and preparation method of a broadband gradient LED fluorescent film. 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 and low-current start-up, fast response, shock and impact resistance, planar packaging, easy to develop into ultra-thin and short products and other series ...

Claims

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Application Information

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IPC IPC(8): C09K11/80B22F9/24C23C20/08C09K11/59
Inventor 李廷凯李晴风张拥军陈建国唐冬汉虞爱民谭丽霞李勇
Owner HUNAN SCI & TECH RES & DEV CENT
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