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Near-ultraviolet excited green phosphor for non-contact temperature detector

A green phosphor, temperature detector technology, used in thermometers, luminescent materials, thermometers with physical/chemical changes, etc., can solve problems such as sensor damage, and achieve the effects of energy saving, high sensitivity, and low sintering temperature

Active Publication Date: 2020-02-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most temperature sensors need to be in direct contact with the target object, but when the temperature of the measured object is too high, the sensor will be damaged. Therefore, the optical temperature detector is famous for its non-contact, fast response, non-invasive operation and The advantages of anti-interference to strong electric field and strong magnetic field have become a hot spot of people's attention

Method used

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  • Near-ultraviolet excited green phosphor for non-contact temperature detector
  • Near-ultraviolet excited green phosphor for non-contact temperature detector
  • Near-ultraviolet excited green phosphor for non-contact temperature detector

Examples

Experimental program
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Effect test

Embodiment example 1

[0019] According to the chemical formula SrLa 0.01 Er 0.99 AlO 4 The stoichiometric ratio of each element in the 3 ) 2 , La(NO 3 ) 3 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, Er 2 o 3 , (NH 4 )HCO 3 ; Utilize (NH 4 )HCO 3 Prepare precipitant solution, concentration is 3mol / L; Er that takes by weighing 2 o 3 Dissolve with an appropriate amount of concentrated nitric acid, add a small amount of ultrapure water to configure the erbium nitrate solution; then add the weighed Sr(NO 3 ) 2 (A.R.), La(NO 3 ) 3 · 6H 2 O, Al(NO 3 ) 3 · 9H 2 O was dissolved in ultrapure water, stirred for 30 minutes to fully dissolve, and the prepared erbium nitrate solution was fully mixed with this solution; the precipitant was added dropwise to adjust pH=9 to form a suspension; after 24 hours, remove For the upper liquid, rinse the precipitate with ultrapure water until the nitrate ion disappears; put the precipitate in an oven and dry it thoroughly at 90°C. The dried sample was pulverized...

Embodiment example 2

[0021] According to the chemical formula SrLa 0.03 Er 0.97 AlO 4 The stoichiometric ratio of each element in the 3 ) 2 , La(NO 3 ) 3 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, Er 2 o 3 , (NH 4 )HCO 3 ; Utilize (NH 4 )HCO 3 Prepare precipitant solution, concentration is 3mol / L; Er that takes by weighing 2 o 3 Dissolve with an appropriate amount of concentrated nitric acid, add a small amount of ultrapure water to configure the erbium nitrate solution; then add the weighed Sr(NO 3 ) 2 (A.R.), La(NO 3 ) 3 · 6H 2 O, Al(NO 3 )3 · 9H 2 O was dissolved in ultrapure water, stirred for 30 minutes to fully dissolve, and the prepared erbium nitrate solution was fully mixed with this solution; the precipitant was added dropwise to adjust pH=9 to form a suspension; after 24 hours, remove For the upper liquid, wash the precipitate with ultrapure water until the nitrate ion disappears; put the precipitate in an oven and dry it thoroughly at 90°C. The dried sample was pulverized in...

Embodiment example 3

[0023] According to the chemical formula SrLa 0.07 Er 0.93 AlO 4 The stoichiometric ratio of each element in the 3 ) 2 (A.R.), La(NO 3 ) 3 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, Er 2 o 3 (99.99%), (NH 4 )HCO 3 ; Utilize (NH 4 )HCO 3 Prepare precipitant solution, concentration is 3mol / L; Er that takes by weighing 2 o 3 Dissolve with an appropriate amount of concentrated nitric acid, add a small amount of ultrapure water to configure the erbium nitrate solution; then weigh the Sr (NO 3 ) 2 (A.R.), La(NO 3 ) 3 · 6H 2 O, Al(NO 3 ) 3 · 9H 2 O was dissolved in ultrapure water, stirred for 30 minutes to fully dissolve, and the prepared erbium nitrate solution was fully mixed with this solution; the precipitant was added dropwise to adjust pH=9 to form a suspension; after 24 hours, remove For the upper liquid, wash the precipitate with ultrapure water until the nitrate ion disappears; put the precipitate in an oven and dry it thoroughly at 90°C. The dried sample was p...

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Abstract

The invention discloses near-ultraviolet excited green phosphor for a non-contact temperature detector and a preparation method of the near-ultraviolet excited green phosphor, and belongs to the technical field of rare earth light emitting materials. The chemical formula of the near-ultraviolet excited green phosphor is SrLa(1-x)ErxAlO4, wherein x is larger than or equal to 0.01 and smaller than or equal to 0.07. A precursor is synthesized by a chemical coprecipitation method with stronium salt, lanthanum, aluminum-containing compound and erbium oxide as raw materials and ammonium carbonate, ammonium oxalate and ammonium bicarbonate as precipitants, a target product is prepared in combination with a primary calcination process, the phosphor has higher absorption at 350-370 nm, 370-390 nm and 475-490 nm, has emitting spectrum peaks near 528 nm and 548 nm respectively, has relation between corresponding fluorescence intensity ratio of two emission bands and temperature change of phosphorfollowing fluorescence intensity ratio (FIR), has good light emitting performance in a range of 298-573 K and has sensitivity up to 1.42% K<-1>, and the near-ultraviolet excited green phosphor for the non-contact temperature detector has potentials.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials and fluorescence intensity ratio temperature detection, and in particular relates to a near-ultraviolet excited metaaluminate-based green fluorescent powder and a preparation method thereof. Background technique [0002] Both high precision and high sensitivity are necessary for temperature measurement. At present, most temperature sensors need to be in direct contact with the target object, but when the temperature of the measured object is too high, the sensor will be damaged. Therefore, the optical temperature detector is famous for its non-contact, fast response, non-invasive operation and The advantages of anti-interference to strong electric field and strong magnetic field have become a focus of attention. Generally, in optical thermometry, the excited state, luminous intensity, fluorescence intensity ratio (FIR), position and width of emission bands all change with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/50G01K11/20
CPCC09K11/7774G01K11/20H01L33/502
Inventor 朱达川岳成
Owner SICHUAN UNIV
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