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Method for preparing ordered cubic phase up-conversion material by laser-induced phase transformation

A technology for converting materials and lasers, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve problems such as limited material application, reduced luminous efficiency, energy loss, etc., and achieve strong luminous intensity, improved quantum efficiency, and less anharmonic vibration Effect

Inactive Publication Date: 2016-11-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to the above principles, NaYF 4 :M 3+ The luminescence of the material is realized by the energy transfer between the light-absorbing center and the luminescent center, but a lot of energy loss will occur during the energy transfer process, resulting in a decrease in luminous efficiency, which greatly limits the application of this type of material
Analyzing the cause of energy loss, on the one hand, when the distance between the light absorption center and the luminescence center is far away, the long-distance transfer of energy causes an increase in loss; on the other hand, there is an energy relaxation phenomenon when the energy is transferred over a short distance, and the reason for the energy relaxation is Thanks to NaYF 4 :M 3+ The anharmonic phonon vibrations in the material lattice cause the rapid consumption of excited virtual states, resulting in a large loss of energy
Currently there is no single method that can effectively reduce NaYF 4 :M 3+ Based on the energy loss of materials during up-conversion luminescence, it is urgent to develop a simple and effective method to prepare NaYF with less energy loss and higher luminous efficiency. 4 :M 3+ up-conversion luminescent material

Method used

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  • Method for preparing ordered cubic phase up-conversion material by laser-induced phase transformation
  • Method for preparing ordered cubic phase up-conversion material by laser-induced phase transformation
  • Method for preparing ordered cubic phase up-conversion material by laser-induced phase transformation

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Embodiment 1

[0027] Embodiment 1: Preparation of ordered cubic phase NaYF 4 :Yb 3+ (18mol%), Er 3+ (2 mol%) upconversion material.

[0028] Preparation of Hexagonal NaYF with a Size of 200nm by Hydrothermal Method 4 :Yb 3+ (18mol%), Er 3+ (2 mol%) upconversion material. Set the stirring speed to 450r / min, dissolve 0.5g NaOH in 10mL deionized water while stirring, then add 5mL oleic acid until it is completely gelled, then add 15mL methanol, and continue stirring until the solution is completely transparent.

[0029] Take 800 μL 1M YCl 3 solution, 180 μL 1M YbCl 3 solution and 200 μL 0.1M ErCl 3 solution, mixed evenly to prepare a mixed rare earth ion chloride solution, and added to the above solution.

[0030] Then add 2.75mL of 2M NaF solution, the molar ratio of the amount of NaF to the total amount of rare earth ions in the solution is 5.5, after fully stirring for 30min, transfer the mixture into a 50mL polytetrafluoroethylene reactor, and react at 160°C for 3 days The reacto...

Embodiment 2

[0038] Embodiment 2: Preparation of ordered cubic phase NaYF 4 :Er 3+ (2 mol%) upconversion material.

[0039] Preparation of Hexagonal NaYF with a Size of 300nm by Hydrothermal Method 4 :Er 3+ (2 mol%) upconversion material. Set the stirring speed to 450r / min, dissolve 0.5g NaOH in 10mL deionized water while stirring, then add 5mL oleic acid until gelling, then add 15mL methanol, and continue stirring until the solution is transparent.

[0040] Take 980 μL 1M YCl 3 solution and 200 μL 0.1M ErCl 3 The solutions are mixed evenly to prepare a mixed rare earth ion chloride solution, which is then added to the above solution.

[0041] Then add 2.25mL 2M NaF solution, the molar ratio of the amount of NaF to the total amount of rare earth ions in the solution is 4.5, after stirring for 30min, transfer the mixture into a 50mL polytetrafluoroethylene reactor, and react at 210°C for 3.5 days Finally, the reactor was taken out and down to room temperature, and the obtained sample...

Embodiment 3

[0045] Embodiment 3: Preparation of ordered cubic phase NaYF 4 :Yb 3+ (20mol%),Tm 3+(0.2mol%)up-conversion material

[0046] Preparation of Hexagonal NaYF with a Size of 400nm by Hydrothermal Method 4 :Yb 3+ (20mol%),Tm 3+ (0.2 mol%) upconversion material. Set the stirring speed to 450r / min, dissolve 0.5g NaOH in 10mL deionized water while stirring, then add 5mL oleic acid until gelling, then add 15mL methanol, and continue stirring until the solution is transparent.

[0047] Take 798 μL 1M YCl 3 solution, 200 μL 1M YbCl 3 solution and 200 μL 0.01M TmCl 3 The solutions are mixed evenly to prepare a mixed rare earth ion chloride solution, which is then added to the above solution.

[0048] Then add 2.5mL 2M NaF solution, the molar ratio of the amount of NaF to the total amount of rare earth ions in the solution is 5, after stirring for 30min, transfer the mixture into a 50mL polytetrafluoroethylene reactor, and react at 200°C for 5 days The reactor was taken out to co...

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Abstract

The invention discloses a method for preparing an ordered cubic phase up-conversion material by laser-induced phase transformation. The method is characterized in that a hexagonal-phase NaYF4:M<3+> up-conversion material is prepared by a hydrothermal method; the hexagonal-phase NaYF4:M<3+> up-conversion material is dried and grounded to powder; and the material is placed onto a substrate and irradiated by 400-600 W cm<-2> near-infrared laser until luminous intensity of the hexagonal-phase NaYF4:M<3+> up-conversion material is no longer enhanced such that an ordered cubic phase hexagonal-phase up-conversion material NaYF4:M<3+> up-conversion material is formed. Luminous intensity of the ordered cubic phase NaYF4: M<3+> up-conversion material prepared by the method is stronger than luminous intensity of the material before phase transformation. Quantum efficiency is raised to 8.14%. In addition, the implementation process is simpler and more feasible and safer.

Description

technical field [0001] The invention belongs to the technical field of preparation of luminescent materials, and in particular relates to the preparation of ordered cubic phase NaYF by using near-infrared laser-induced phase transition 4 :M 3+ Method for upconverting material. Background technique [0002] According to the British "Nature" magazine ("Nature", 2010, Vol. 463, p. 1061) and the British "Chemical Society Reviews", the British "Chemical Society Reviews", 2009, Vol. 38, p. 976), the up-conversion luminescence is a reflection -Stokes luminescence, which can convert long-wavelength near-infrared light into shorter-wavelength visible light by absorbing one or a few photons, has great application potential in the fields of biological imaging, therapeutics, photonics, and solar optoelectronics. But so far this phenomenon only exists in the up-conversion luminescent material doped with rare earth ions. At present, the up-conversion luminescent material with wide appli...

Claims

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Application Information

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IPC IPC(8): C09K11/85
CPCC09K11/7772
Inventor 熊宇杰王瑶王利民江俊李正全
Owner UNIV OF SCI & TECH OF CHINA
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