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A near-ultraviolet-excited green phosphor for non-contact temperature detectors

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

Active Publication Date: 2021-09-28
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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  • A near-ultraviolet-excited green phosphor for non-contact temperature detectors
  • A near-ultraviolet-excited green phosphor for non-contact temperature detectors
  • A near-ultraviolet-excited green phosphor for non-contact temperature detectors

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 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, 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 into...

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 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 pulverized into f...

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 a near-ultraviolet excited green fluorescent powder for a non-contact temperature detector and a preparation method thereof, belonging to the technical field of rare earth luminescent materials, and its chemical formula is SrLa (1‑x) Er x AlO 4 , where 0.01≤x≤0.07. In the present invention, strontium salt, lanthanum salt, aluminum-containing compound, and erbium oxide are used as raw materials, ammonium carbonate, ammonium oxalate, and ammonium bicarbonate are used as precipitating agents, and the chemical co-precipitation method is used to synthesize the precursor, and the target product is prepared in combination with a calcination process. The powder has strong absorption at 350-370nm, 370-390nm, and 475-490nm, and the emission spectrum peaks are located near 528nm and 548nm respectively. The relationship between the fluorescence intensity ratio corresponding to the two emission bands and the temperature change of the phosphor follows the fluorescence intensity ratio (FIR) Principle, in the range of 298K-573K, the luminous performance is good, and its sensitivity can reach 1.42%K ‑1 , is a near-ultraviolet excited green phosphor with potential application in non-contact temperature detectors.

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 Patents(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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