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A kind of LED light source for spectrophotometer and preparation method thereof

A technology of LED light source and spectrophotometer, which is applied in the field of analytical instruments, can solve problems such as short service life, poor test results, and easy damage, and achieve the effects of simplifying instrument design, long service life, and improving stability

Active Publication Date: 2020-04-14
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This combination of light sources has obvious disadvantages when used: 1. These light sources are easily damaged and have a short service life; 2. When testing the spectrum covering the ultraviolet-visible wide spectral range, it is necessary to carry out two light source lamps. Switching, which not only brings additional troubles to the instrument design, but also leads to poor test results; 3. Although the combined light source of the deuterium lamp and the tungsten lamp has a certain output intensity at different positions in the entire spectral region, the different wavelength positions The intensity difference is obvious, and the intensity of a few wavelengths is too high or too low, which will lead to the deterioration of the signal-to-noise ratio in some spectral regions when performing absorption spectrum tests covering a wide range of ultraviolet-visible spectra, especially not suitable for multi-channel detectors such as Application of fiber optic spectrometer to fast spectral detection of novel spectrophotometer
But similarly, the main purpose of the white light LED obtained by this scheme is also illumination, and the luminous intensity is not uniform under different wavelengths in the ultraviolet-visible range, so it is difficult to be used as a light source for a spectrophotometer
[0012] In summary, there is still a lack of a white light LED that can emit uniformly in a wide wavelength range and has good stability and can be used as a light source for a spectrophotometer.

Method used

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  • A kind of LED light source for spectrophotometer and preparation method thereof
  • A kind of LED light source for spectrophotometer and preparation method thereof
  • A kind of LED light source for spectrophotometer and preparation method thereof

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preparation example Construction

[0051] The chemical formula of the near-infrared phosphor used is Ca 1.96 Mg 0.999 WO 6 :0.02Bi 3+ ,0.001Cr 3+ . The preparation method of the fluorescent powder comprises the following steps:

[0052] (1) Press Ca 1.96 Mg 0.999 WO 6 :0.02Bi 3+ ,0.001Cr 3+ stoichiometric ratio, accurately weigh the raw material CaCO 3 、WO 3 , MgO, Bi 2 o 3 and Cr(NO 3 ) 3 , placed in an agate mortar and thoroughly ground and mixed to obtain a raw material mixture;

[0053] (2) The raw material mixture obtained in step (1) is placed in a corundum crucible and moved into a muffle furnace. Raise the muffle furnace to 600°C and keep it at a constant temperature for 2h;

[0054] (3) After cooling the sample obtained in step (2), take out the sample and grind it again, then sinter at 1300°C for 5h, cool down to room temperature with the furnace, and grind the obtained sintered body into powder.

[0055] Its emission spectrum is as Figure 7 shown.

[0056] The emission wavelength...

Embodiment 1

[0058] A method for preparing an LED light source for a spectrophotometer, comprising the steps of:

[0059] (1) Mix 15 mg of blue phosphor, 40 mg of green phosphor, 1 mg of red phosphor and 600 mg of near-infrared phosphor, grind and mix them in an agate mortar to obtain a mixed phosphor;

[0060] (2) Take the container, add 1g of silica gel (Momentive, IVS4542) and stir with a glass rod for 5 minutes, then add the mixed fluorescent powder obtained in step (1), stir with a glass rod for 5 minutes, and vacuum defoam for 4 hours to obtain a mixed fluorescent colloid;

[0061] (3) Take 0.2 g of the mixed fluorescent colloid obtained in step (2) and apply it on the surface of the ultraviolet LED chip with a thickness of 0.1 cm;

[0062] (4) Curing: Bake the colloid-coated UV chip at 100°C for 1 hour, then raise the temperature to 150°C and bake for 3 hours to obtain the LED light source for the spectrophotometer. The resulting spectrophotometer uses an LED light source such as ...

Embodiment 2

[0064] A method for preparing an LED light source for a spectrophotometer, comprising the steps of:

[0065] (1) Mix 12 mg of blue phosphor, 35 mg of green phosphor, 0.8 mg of red phosphor and 500 mg of near-infrared phosphor, grind and mix them in an agate mortar to obtain a mixed phosphor;

[0066] (2) Take the container, add 1g of silica gel (Momentive, IVS4542), stir evenly with a glass rod for 5min, then add the mixed fluorescent powder obtained in step (1), stir evenly with a glass rod for 5min, and then vacuum defoam for 4h to obtain a mixed fluorescent colloid;

[0067] (3) Take 0.3 g of the mixed fluorescent colloid obtained in step (2) and apply it on the surface of the ultraviolet LED chip, with a thickness of 0.2 cm;

[0068] (4) Curing: Bake the colloid-coated UV chip at 100°C for 1 hour, then raise the temperature to 150°C and bake for 3 hours to obtain the LED light source for the spectrophotometer. Its emission spectrum is as Figure 5 shown.

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Abstract

The invention discloses an LED light source for a spectrophotometer and a preparation method of the LED light source. The LED light source for the spectrophotometer comprises an ultraviolet LED chip,and mixed fluorescent powder packaged on the ultraviolet LED chip, wherein the mixed fluorescent powder is prepared from blue fluorescent powder, green fluorescent powder, red fluorescent powder and near infrared fluorescent powder at the mass ratio of (12-18):(35-45):(0.8-1.2):(500-800), and the blue fluorescent powder, the green fluorescent powder, the red fluorescent powder and the near infrared fluorescent powder all can be excited by ultraviolet light emitted from the ultraviolet LED chip. The disadvantages that a traditional light source lamp (combination of a deuterium lamp and a tungsten lamp) is large in volume and short in life, and a light source needs to be switched in a wide spectrum range test are overcome; the LED light source has the advantages that the light source is noteasily damaged and the service life is long; and meanwhile, the luminous intensity of the LED light source at different wavelength positions within a wide spectrum range in an ultraviolet visible light region is similar, the LED light source is simple and fast when fast acquisition of an absorption spectrum is carried out by using a multichannel detector-based spectrophotometer, and the obtained absorption spectrum is good in signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the field of analytical instruments, and in particular relates to an LED light source for a spectrophotometer and a preparation method thereof. Background technique [0002] A spectrophotometer is a commonly used spectral instrument for analysis and testing. It is widely used in production and scientific research in the fields of agriculture, chemical industry, food, environment, materials, medicine and so on. An ideal light source for a spectrophotometer requires that the light emitted by the light source have a substantially constant intensity at different wavelengths throughout the measured spectral region. However, there is no light source that can meet the requirements of the ideal spectrum. [0003] At present, ordinary spectrophotometers usually use deuterium-tungsten combined light source. This combined light source contains two light source lamps, one is for the lamp in the ultraviolet region (deuterium lamp, mercury...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/48H01L33/50H01L33/00
CPCH01L33/005H01L33/48H01L33/504
Inventor 孟建新张琪黎婉雯许丹丹
Owner JINAN UNIVERSITY
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