A fluorescent material with ultra-high quantum yield and its application

A fluorescent material and ion technology, applied in the field of luminescence, can solve the problem of not preparing rare earth ion clusters, etc., and achieve the effects of improving photoelectric conversion efficiency, improving spectral response, and improving quantum efficiency

Active Publication Date: 2015-11-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, three or more rare earth ion clusters with cooperative absorption and cooperative emission capabilities have not been prepared before.

Method used

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  • A fluorescent material with ultra-high quantum yield and its application
  • A fluorescent material with ultra-high quantum yield and its application
  • A fluorescent material with ultra-high quantum yield and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] CaF 2 : Preparation of xYb (x=0.1%, 0.5%, 2%, 10%, 30%, 50%) fluorescent cluster materials and their optical properties.

[0086] Weigh a certain amount of CaF according to the molar ratio 2 and YbF 3 , Grind it thoroughly to make it evenly mixed and put it into Al 2 o 3 Porcelain boats or other non-corrosive crucibles are placed in a vacuum environment at 1200°C for 2 hours and then taken out after cooling to room temperature naturally to obtain a white mixed crystal block material; grind the obtained white mixed crystal block material to obtain particles (powder )Material.

[0087] figure 1 for CaF 2 : XRD spectrum of 2% Yb fluorescent cluster material and absorption spectra of samples with different molar ratios. Under the irradiation of 266nm or 915nm ultraviolet light, CaF 2 : 1%Yb fluorescent cluster material can emit near-infrared light near 1μm, such as figure 2 and image 3 shown. The measurement results show that under the irradiation of 355nm ultr...

Embodiment 2

[0089] Ca 1-x Sr x f 2 : Preparation and optical properties of 0.5%Yb(x=0,0.5,1,2,3,5%) fluorescent cluster materials.

[0090] According to Ca 2+ with Sr 2+ The molar ratio of CaF was weighed respectively 2 and SrF 2 , the total amount of the mixture is 2mmol, fully ground to make it evenly mixed; then 0.04mmolYbF 3 Add it to the above mixture and continue to grind. After mixing evenly, put it into a porcelain boat, place it in a vacuum environment at 1200 ° C for 2 hours, and take it out after naturally cooling to room temperature. Under the irradiation of 980nm near-infrared light, 0.02mmol of divalent cation Sr 2+ The cooperative luminescent properties of fluorescent cluster materials such as Figure 9 As shown, it indicates that the material is a Yb fluorescent cluster material with cluster luminescence characteristics. Under the irradiation of 266nm or 355nm ultraviolet light, CaF 2 : 2%Yb / 1%Sr fluorescent cluster material can emit near-infrared light near 1μm,...

Embodiment 3

[0092] (CaF 2 ) 1-x (CaCl 2 ) x : Preparation and optical properties of 0.5%Yb(x=0,1,2,5,7,10%) fluorescent cluster materials. According to CaF 2 with CaCl 2 Weigh a certain amount of CaF in the molar ratio 2 and CaCl 2 , the total amount of the mixture is 2mmol, grind it well to make it evenly mixed. Then add 0.01mmolYbF 3 Add it to the above mixture and continue to grind. After mixing evenly, put it into a porcelain boat, place it in a vacuum environment at 1200 ° C for 2 hours, and take it out after naturally cooling to room temperature. Under the irradiation of 980nm near-infrared light, the monovalent anion Cl - The cooperative luminescent properties of fluorescent cluster materials such as Figure 14 As shown, it indicates that the material is a Yb fluorescent cluster material with cluster luminescence characteristics. Under 266nm or 355nm ultraviolet light irradiation, (CaF 2 ) 1-x (CaCl 2 ) x :0.5%Yb(x=0,1,2,5,7,10%) fluorescent cluster materials can emi...

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Abstract

The invention discloses a fluorescent material with an ultrahigh quantum yield and an application of the fluorescent material, belongs to the technical field of lighting, and particularly relates to a down-conversion fluorescent material and the application thereof, with an ultrahigh quantum yield, cooperatively absorbed by high-energy photon of lighting clusters composed of three or more Yb3+ions and discretely transmitted by a plurality of low-energy photons. The fluorescent material is composed of inorganic substrate materials and lanthanide-based ytterbium ion Yb3+ions which is doped in the inorganic substrate materials in the form of the clusters, and the molar concentration of the Yb3+ions is calculated to be from 0.01% to 20% on the basis that the sum of the molar concentration of whole metal positive ions is 100%. The number of the Yb3+ions in the clusters is three, four, five or more. The fluorescent material can be applied to improve photoelectric conversion efficiency of solar cells, and reduce ultraviolet irradiation intensity and photovoltaic cell thermalization loss.

Description

technical field [0001] The invention belongs to the field of luminescent technology, and in particular relates to a Yb compound comprising three or more than three 3+ A down-conversion fluorescent material with an ultra-high quantum yield of high-energy photon cooperative absorption of ions constituting a luminescent cluster and multiple low-energy photon discrete emission and its application. Background technique [0002] Quantum yield (English: quantumyield; also known as quantum efficiency, English: quantumefficiency) is one of the important indicators to measure the characteristics of fluorescent materials. In the field of luminescent materials and application technology, quantum yield is defined as the number of photons absorbed by the material (n a ) vs. the number of emitted photons (n e ), the reciprocal of the ratio, namely: the quantum yield The quantum yield thus defined is also called internal quantum yield (IQY) or internal quantum efficiency (IQE). The rat...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C09K11/61C09K11/55H01L31/055
CPCY02E10/52
Inventor秦伟平刘真育秦冠仕郑克志
OwnerJILIN UNIV