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Weak light frequency upconversion o/w type microemulsion system

A microemulsion and frequency technology, applied in the field of nonlinear optical materials, can solve the problems that are not conducive to the practical application of weak light up-conversion process, reduce the up-conversion efficiency, quenching, etc., achieve stable up-conversion efficiency and increase frequency up-conversion intensity , high stability effect

Inactive Publication Date: 2014-11-19
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The triplet-triplet annihilation (TTA) upconversion efficiency depends on the triplet properties of the photosensitizer and luminescent agent; Quenching, usually frequency up-conversion needs to be obtained under the condition of isolating air (deoxygenation), which makes up-conversion very limited in practical applications
Since the photosensitizer and luminescent agent are wrapped into the polymer, the mutual contact and collision between the donor and acceptor molecules is limited, which greatly reduces the upconversion efficiency, and some are even lower than 1%, which is not conducive to the weak light upconversion process. practical application

Method used

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  • Weak light frequency upconversion o/w type microemulsion system
  • Weak light frequency upconversion o/w type microemulsion system
  • Weak light frequency upconversion o/w type microemulsion system

Examples

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Effect test

Embodiment 1

[0034] Example 1 Preparation of weak light frequency up-conversion o / w microemulsion system

[0035] In this example:

[0036] The molecular structure of the metalloporphyrin complex used for photosensitizer is as follows:

[0037]

[0038] The structural formula of the luminescent agent is one of the following structural formulas:

[0039]

[0040] The surfactant is: fatty acid glyceride or Tween homologue;

[0041]Benzene solvents are: toluene or xylene;

[0042] The mol ratio of water and benzene solvent is (1~10): 1;

[0043] The mol ratio of water and surfactant is (1~10): 1;

[0044] The molar ratio of the luminescent agent to the photosensitizer is (1-300):1.

[0045] Two-component microemulsion configuration: put a certain ratio of surfactant and deionized water mixed solution in a nitrogen atmosphere and stir to make it completely deoxidized, then add a benzene solvent solution containing a photosensitizer and a luminescent agent, After stirring, a transpa...

Embodiment 2

[0054] Example 2 Preparation of DNAMe / PdMeTPP systems with different luminescent agent concentrations

[0055] Stir the mixed solution of Tween-20 (10mL) and deionized water (18mL) in an atmosphere of nitrogen to make it completely deoxygenated, then add 2mL containing photosensitizer DNAMe (0.12mM) and luminescent agent PdMeTPP (1.2mM~ 48mM) toluene solution, after stirring, DNAMe / PdMeTPP microemulsion systems with different luminescent agent concentrations were obtained.

Embodiment 3

[0061] Example 3 Application of weak light frequency up-conversion o / w microemulsion system in ditungsten trioxide catalytic hydrogen production

[0062] Deposit tungsten trioxide on the surface of ITO glass as photoanode, platinum rod electrode as cathode, and 1.0M sulfuric acid aqueous solution as electrolyte. Photoanode WO 3 The effective area is 1cm 2 . Under the excitation of ultraviolet light, the tungsten trioxide photoanode undergoes oxidation reaction to generate photocurrent, and at the same time, hydrogen gas is generated on the cathode.

[0063] The up-conversion two-component solution (1cm optical path) placed near the working electrode is photoactivated, and the laser (diode-pumped solid-state type, emission wavelength: 532nm, 60mW / cm 2 ) is used as the excitation light source for the upconversion two-component, and produces photoelectrochemical upconversion, emits blue light, and drives tungsten trioxide to undergo electronic transitions to obtain photocurren...

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Abstract

The invention belongs to the field of nonlinear optical materials and particularly discloses a weak light frequency upconversion o / w type microemulsion system for triplet state annihilated weak light upconversion. When a medium contains a heavy metal porphyrin derivative as a photosensitizer which forms an upconversion microemulsion with a tri-substituted anthracene derivative as a luminescence reagent, the system is stable, nontoxic and simple to prepare. Particularly importantly, the technology is implemented without isolating air, so that the system has a practical value. Frequency upconversion fluorescence emitted by short waves activated by long waves can be obtained in a weak light field (less than 60mW*cm<-2>), and the upconversion efficiency can reach up to 32.14%. The system can be used for photo-electrochemical hydrogen preparation and has a potential application value in the fields of solar photovoltaic field, solar photocatalytic, environmental photo-chemical technologies and the like.

Description

technical field [0001] The invention belongs to the field of nonlinear optical materials, and in particular relates to a weak light frequency up-converting o / w microemulsion system which uses an o / w microemulsion as a medium and contains a photosensitizer and a luminescent agent. Background technique [0002] The emergence of high-energy pulsed lasers has confirmed that substances can undergo two-photon absorption under strong light fields, realize long-wave excitation and short-wave emission, and achieve frequency up-conversion (Up-conversion). Two-photon upconversion has shown high application value in high-tech fields such as three-dimensional optical storage, laser light limiting, upconversion lasing, three-dimensional fluorescence microscopy and photodynamic cancer treatment, which has aroused great interest in the scientific community. However, two-photon "upconversion" requires intense optical excitation with high peak power, with pulse intensities up to MW×cm -2 ~GW...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C09K11/02C25B5/00
Inventor 王筱梅叶常青王宝周宇扬丁平朱赛江梁作芹
Owner SUZHOU UNIV OF SCI & TECH
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