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Down-conversion fluorescent powder Ba3EuAl2O7.5 with negative thermal quenching behavior and preparation method thereof

A ba3eual2o7.5, phosphor technology, applied in chemical instruments and methods, luminescent materials, inorganic chemistry, etc., can solve the problems of excitation energy loss, reduction of phosphor emission intensity, and reduction of phosphor luminous efficiency, and achieves simple process, Highly reproducible and productive results

Active Publication Date: 2022-07-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is due to the increase in the number of phonons as the temperature increases, leading to an increase in the probability of non-radiative relaxation, resulting in a decrease in the emission intensity of the phosphor
A large loss of excitation energy reduces the luminous efficiency of the phosphor
At the same time, in some types of phosphors, there is also the problem of unstable emission color with the increase of temperature.
As the requirements for the application of phosphors in various fields become more and more precise and strict, these defects will seriously limit the application and development scope of phosphors

Method used

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  • Down-conversion fluorescent powder Ba3EuAl2O7.5 with negative thermal quenching behavior and preparation method thereof
  • Down-conversion fluorescent powder Ba3EuAl2O7.5 with negative thermal quenching behavior and preparation method thereof
  • Down-conversion fluorescent powder Ba3EuAl2O7.5 with negative thermal quenching behavior and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example proposes a down-conversion phosphor Ba with negative thermal quenching behavior 3 EuAl 2 O 7.5 , belongs to the monoclinic crystal system, and the specific preparation steps are as follows:

[0029] Step 1: The raw material BaCO with a purity greater than 99.9% 3 , Eu 2 O 3 , Al(OH) 3 Weigh in a molar ratio of 6:1:4, specifically weigh 8.8803g of BaCO 3 , 2.6395g of Eu 2 O 3 and 2.3400g of Al(OH) 3 ;

[0030] Step 2: Put all the raw materials weighed in Step 1 into an agate mortar, add 30ml of anhydrous ethanol as a dispersion medium, fully grind and mix evenly to obtain a suspension;

[0031] Step 3: put the suspension obtained in step 2 into a drying box after standing for a period of time, set the drying temperature to 60°C, and dry for 8 hours to completely evaporate the absolute ethanol to obtain mixed raw materials;

[0032] Step 4: Grind the mixed raw materials obtained in step 3 again to make the mixing between the components more uniform...

Embodiment 2

[0035] This example proposes a down-conversion phosphor Ba with negative thermal quenching behavior 3 EuAl 2 O 7.5 , belongs to the monoclinic crystal system, and the specific preparation steps are as follows:

[0036] Step 1: The raw material BaCO with a purity greater than 99.9% 3 , Eu 2 O 3 , Al(OH) 3 Weigh in a molar ratio of 6:1:4, specifically weigh 8.8803g of BaCO 3 , 2.6395g of Eu 2 O 3 , 2.3400g of Al(OH) 3 ;

[0037] Step 2: Put all the raw materials weighed in Step 1 into an agate mortar, add 30ml of anhydrous ethanol as a dispersion medium, fully grind and mix evenly to obtain a suspension;

[0038] Step 3: put the suspension obtained in step 2 into a drying box after standing for a period of time, set the drying temperature to 60°C, and dry for 8 hours to completely evaporate the absolute ethanol to obtain mixed raw materials;

[0039] Step 4: Grind the mixed raw materials obtained in step 3 again to make the mixing between the components more uniform, ...

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Abstract

The invention provides down-conversion fluorescent powder Ba3EuAl2O7.5 with negative heat quenching behavior and a preparation method thereof, and belongs to the field of inorganic luminescent materials, the down-conversion fluorescent powder is prepared by a high-temperature solid phase method, and the preparation method specifically comprises the following steps: weighing raw materials according to the molar ratio of elements Ba, Eu and Al of 3: 1: 2, adding absolute ethyl alcohol, stirring, standing, drying, pressing to obtain a wafer, and sintering the wafer in a high-temperature muffle furnace at 1450-1550 DEG C for 250-420 minutes to obtain the down-conversion fluorescent powder Ba3EuAl2O7.5 with negative heat quenching behavior. The down-conversion fluorescent powder Ba3EuAl2O7.5 of a monoclinic system is obtained, the down-conversion fluorescent powder Ba3EuAl2O7.5 can emit strong orange red light under excitation of UV / NUV light, shows an obvious negative heat quenching behavior within 30-300 DEG C, namely, the luminous intensity is remarkably enhanced along with temperature rise, and has excellent thermal stability, a simple preparation process and a wide application prospect.

Description

technical field [0001] The invention belongs to the field of inorganic light-emitting materials, in particular to a down-conversion phosphor Ba with negative thermal quenching behavior 3 EuAl 2 O 7.5 and its preparation method. Background technique [0002] Inorganic light-emitting materials can emit different colors of light under external excitation, which makes them occupy an important position in various fields. Thermal stability is one of the important parameters for evaluating the performance of phosphors. Most fluorescent materials have thermal quenching behavior, that is, the emission intensity decreases with the increase of temperature. This is due to the increase in the number of phonons with increasing temperature, which leads to an increase in the probability of nonradiative relaxation, resulting in a decrease in the phosphor emission intensity. A large amount of excitation energy is lost, which reduces the luminous efficiency of the phosphor. At the same t...

Claims

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Application Information

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IPC IPC(8): C09K11/80C01F17/34
CPCC09K11/7734C01F17/34C01P2002/72Y02B20/00
Inventor 付浩边晓敏王若男李秋阳
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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