Eu-Nd-Yb jointly doped strontium aluminate efficient broadband quantum cutting luminescent material

A eu-nd-yb, luminescent material technology, applied in luminescent materials, electrical components, circuits, etc., can solve the problems of low actual utilization rate of solar spectrum, low conversion efficiency of sunlight, low energy transfer efficiency, etc. Conversion efficiency, broad-spectrum conversion utilization, and the effect of broadening the absorption cross section

Active Publication Date: 2018-06-22
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above work still has the following disadvantages: (1) Most of the quantum tailoring mechanism of rare earth ions belongs to cooperative energy transfer, resulting in low energy transfer efficiency and easy concentration quenching, so the conversion efficiency of sunlight is low
(2) Some rare earth ion pairs can perform two-step energy transfer (Nd 3+ -Yb 3+ 、Er 3+ -Yb 3+ 、Pr 3+ -Yb 3+ ), thus effectively improving the energy conversion efficiency, but these ions have a narrow absorption cross-section due to the 4f→4f transition, and the actual utilization of the solar spectrum is low

Method used

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  • Eu-Nd-Yb jointly doped strontium aluminate efficient broadband quantum cutting luminescent material
  • Eu-Nd-Yb jointly doped strontium aluminate efficient broadband quantum cutting luminescent material
  • Eu-Nd-Yb jointly doped strontium aluminate efficient broadband quantum cutting luminescent material

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preparation example Construction

[0025] The Eu-Nd-Yb co-doped SrAl 2 O 4 The preparation method of quantum tailored luminescent material includes the following steps:

[0026] Step 1: Weigh SrCO according to a certain mole percentage 3 (A.R.), Al 2 O 3 (A.R.), Eu 2 O 3 (99.9%), Nd 2 O 3 (99.9%), Yb 2 O 3 (99.9%), after that, place the weighed medicine in an agate mortar and grind for 1 to 3 hours to make the mixture uniform, and then place it in a corundum crucible for sintering;

[0027] Step 2. Put the corundum crucible containing the sample into the tube furnace, vacuum for 1~3 times to reduce the pressure in the furnace chamber to below 0.01MPa, and then pass argon until it is stable and then pass in hydrogen, adjust the gas flow rate to two The gas ratio is: 95% <Argon <100%, 1% <Hydrogen <5%, keep the sample in a reducing atmosphere;

[0028] Step 3. Turn on the tube furnace and heat up to 100°C for half an hour at a heating rate of 1°C~5°C per minute to remove the residual moisture in the sample, and then hea...

Embodiment 1

[0036] A Kind of Eu-Nd-Yb Co-doped SrAl 2 O 4 Quantum tailored luminescent material, its general formula is SrAl 2 O 4 :0.5mol% Eu 2+ , 0.5mol% Nd 3+ , 5.0mol% Yb 3+ .

[0037] The specific preparation steps are as follows:

[0038] Step 1. Use an electronic balance to accurately weigh strontium carbonate [SrCO 3 ] 5.4994g, alumina [Al 2 O 3 ] 4.0423g, Europium oxide [Eu 2 O 3 ] 0.0349g, neodymium oxide [Nd 2 O 3 ] 0.0310 g, Ytterbium oxide [Yb 2 O 3 ] 0.3904 g, grind in an agate mortar for 1.5 hours and mix evenly, then transfer the raw material powder obtained by grinding into a corundum crucible for use; after the mixed medicine is ground, the average particle size of the mixed medicine powder is tested 2μm; then put into 50 mL corundum crucible to be sintered;

[0039] Step 2. Put the corundum crucible containing the raw material powder in step one into the tube furnace, and evacuate the furnace to a pressure of 0.01 MPa. After that, argon is introduced until the flow is stable, ...

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Abstract

The invention provides an Eu-Nd-Yb jointly doped strontium aluminate efficient broadband quantum cutting luminescent material. The luminescent material takes SrAl2O4 as a substrate, the compositionalgeneral formula of the luminescent material is SrAl2O4: x Eu<2+>, y Nd<3+>, z Yb<3+>, wherein x is greater than or equal to 0.5*10<-2> and less than or equal to 1*10<-2>, y is greater than or equal to0.5*10<-2> and less than or equal to 2*10<-2>, and z is greater than or equal to 1*10<-2> and less than or equal to 10*10<-2>. According to the Eu-Nd-Yb jointly doped strontium aluminate efficient broadband quantum cutting luminescent material, Eu<2+> in the luminescent material system can effectively widen the absorption cross section of Nd<3+> through the sensitization effect of Eu<2+>, broadband absorption can be conducted on sunlight, and therefore efficient and broadband converting near infrared quantum cutting is achieved. Accordingly sufficient utilization of the sunlight is achieved,and the converting efficiency of crystalline silicon solar cells is improved.

Description

Technical field [0001] The present invention relates to the technical field of solid luminescent materials, in particular to a Eu-Nd-Yb co-doped SrAl with near-infrared quantum tailored down-conversion luminescence 2 O 4 High-efficiency wide-spectrum quantum tailored luminescent materials. Background technique [0002] In recent years, due to the global energy crisis and severe environmental pollution, renewable clean energy represented by solar energy has become the development direction of the new generation of energy system. Crystalline silicon solar cells are currently the most reasonable and effective device for using solar energy and are widely used. However, in actual production, the highest photoelectric conversion efficiency is only 19.0%, which is far below the maximum theoretical value of 31%. [0003] Spectral mismatch is an important reason for the low efficiency of crystalline silicon solar cells. In the solar spectrum (300~2500 nm) irradiated to the ground, only th...

Claims

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Application Information

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IPC IPC(8): C09K11/64H01L31/0264
CPCC09K11/7792H01L31/0264
Inventor 台玉萍柴元武李新忠刘红宇杜西刚杜锦屏黄新辉潘炳力
Owner HENAN UNIV OF SCI & TECH
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