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A kind of up conversion fluorescent powder and its preparation method and application

A phosphor powder and calcination technology, applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., can solve the problems of affecting the application process, poor thermal stability, low luminous efficiency, etc., to improve the up-conversion efficiency, and the conditions are easy to control. , the effect of high external quantum efficiency

Active Publication Date: 2019-03-12
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low luminous efficiency seriously affects its application process
Sodium yttrium fluoride (NaYF 4 ), but due to the certain pollution to the environment during the preparation process, the thermal stability is slightly poor

Method used

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  • A kind of up conversion fluorescent powder and its preparation method and application
  • A kind of up conversion fluorescent powder and its preparation method and application
  • A kind of up conversion fluorescent powder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh gadolinium nitrate hexahydrate (Gd(NO 3 ) 3 *6H 2 O) 1.8750 g, ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 *4H 2 O) 1.3375 g, ytterbium nitrate hexahydrate (Yb(NO 3 ) 3 *6H 2 O) 0.3504 g, Thulium nitrate hexahydrate (Tm(NO 3 ) 3 *6H 2 O) 0.0232 g, holmium nitrate hexahydrate (Ho(NO 3 ) 3 *6H 2 O) 0.0230; dissolve in deionized water and heat to 80 °C with constant stirring. Add 7.9198 g of citric acid and continue to stir, slowly add ammonia water, and adjust the pH value to about 7. Continue to stir for half an hour, then be placed in drying oven air atmosphere at 130 DEG C and dry for 20 hours, then be placed on high-temperature box-type furnace 800 DEG C of constant temperature 2 hours. Cool naturally to room temperature. The sample is taken out to obtain the product, and the resulting phosphor material composition is: Gd 1.83 T m 0.01 Ho 0.01 Yb 0.15 (MoO 4 ) 3 .

[0025] The diffraction peak position of the obtained phosphor ma...

Embodiment 2

[0027] Weigh gadolinium nitrate hexahydrate (Gd(NO 3 ) 3 *6H 2 O) 1.8185 g, ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 *4H 2 O) 1.3375 g, ytterbium nitrate hexahydrate (Yb(NO 3 ) 3 *6H 2 O) 0.3504 g, Thulium nitrate hexahydrate (Tm(NO 3 ) 3 *6H 2 O) 0.0116 g, holmium nitrate hexahydrate (Ho(NO 3 ) 3 *6H 2 O) 0.0919 g; dissolved in deionized water and heated to 80 °C with constant stirring. Add 7.9198 g of citric acid and continue to stir, slowly add ammonia water, and adjust the pH value to about 7. Continue to stir for half an hour, then be placed in drying oven air atmosphere at 130 DEG C and dry for 20 hours, then be placed on high-temperature box-type furnace 800 DEG C of constant temperature 2 hours. Cool naturally to room temperature. The sample is taken out to obtain the product, and the resulting phosphor material composition is: Gd 1.805 T m 0.005 Ho 0.04 Yb 0.15 (MoO 4 ) 3 .

[0028] attached image 3 It is the emission spectrum of ...

Embodiment 3

[0030] Weigh gadolinium nitrate hexahydrate (Gd(NO 3 ) 3 *6H 2 O) 1.8185 g, ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 *4H 2 O) 1.3375 g, ytterbium nitrate hexahydrate (Yb(NO 3 ) 3 *6H 2 O) 0.3504 g, Thulium nitrate hexahydrate (Tm(NO 3 ) 3 *6H 2O) 0.0116 g, holmium nitrate hexahydrate (Ho(NO 3 ) 3 *6H 2 O) 0.0919 g; dissolved in deionized water and heated to 80 °C with constant stirring. Add 7.9198 g of citric acid and continue to stir, slowly add ammonia water, and adjust the pH value to about 7. Continue to stir for half an hour, then be placed in drying oven air atmosphere at 130 DEG C and dry for 20 hours, then be placed on high-temperature box-type furnace 800 DEG C of constant temperature 2 hours. Cool naturally to room temperature. The sample is taken out to obtain the product, and the resulting phosphor material composition is: Gd 1.93 T m 0.01 Ho 0.01 Yb 0.05 (MoO 4 ) 3 .

[0031] attached Figure 4 It is the emission spectrum of th...

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Abstract

The invention discloses an up-conversion phosphor. The general formula of the chemical composition of the up-conversion phosphor is Gd2-x-y-zTmxHoyYbz(MoO4)3, wherein Tm<3+> and Ho<3+> are active ions; Yb<3+> is a sensitive ion; and x is the mole percentage coefficient of Tm<3+> relative to Gd<3+>, y is the mole percentage coefficient of Ho<3+> relative to Gd<3+>, and z is the mole percentage coefficient of Yb<3+> relative to Gd<3+>. A molybdate ion MoO4<2-> is coupled with the sensitive ion Yb<3+> to form a MoO4<2->-Yb<3+> dimer, so higher-order excited state energy transfer up-conversion of the active ions Tm<3+> and Ho<3+> is realized, the non-radiative relaxation of the intermediate energy level of the active ions is reduced, and the up-conversion luminescence intensity is improved. A preparation method of the up-conversion phosphor has the advantages of simplicity, safety in operation, and easy control of conditions. The up-conversion phosphor has wide application prospect in the fields of illumination and display.

Description

technical field [0001] The invention belongs to the field of synthesis of up-conversion materials, and more specifically relates to an up-conversion phosphor and its preparation method and application. Background technique [0002] Using 980 nm semiconductor organ to excite rare-earth-doped up-conversion white light materials, potentially applied in white-light lasers, flat-panel displays, biosensors, backlights and lighting, etc. Compared with traditional white light sources, rare-earth-doped up-conversion white light has no photobleaching , easy to adjust color temperature, environmental protection, and effectively reduce ultraviolet pollution, so it has become a research hotspot. However, the low luminous efficiency seriously affects its application process. Sodium yttrium fluoride (NaYF 4 ), but due to the certain pollution to the environment during the preparation process, the thermal stability is slightly poor. It is particularly important to find an up-conversion m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7776H01L33/502
Inventor 李栋宇黄贞
Owner LINGNAN NORMAL UNIV
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