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A high-efficiency green weak light upconversion system based on protic solvent

A protic solvent and low-light technology, applied in the field of nonlinear optical materials, can solve the problems of high toxicity and volatility, multiplication of synthesis steps, low cost performance, etc., to improve triplet energy level, improve up-conversion efficiency, and up-conversion high efficiency effect

Active Publication Date: 2017-08-11
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, organic up-conversion materials are usually only soluble in organic solvents (such as benzene, toluene, DMF, methylene chloride, acetonitrile, etc.), and these organic solvents are highly toxic and volatile, which severely limits their applications
On the other hand, in order to obtain a high-efficiency TTA-upconversion system, researchers are currently working on the development of new sensitizers with high triplet energy levels. good for the environment

Method used

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  • A high-efficiency green weak light upconversion system based on protic solvent
  • A high-efficiency green weak light upconversion system based on protic solvent
  • A high-efficiency green weak light upconversion system based on protic solvent

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Example 1 Preparation of PdTPP / DPA Upconversion System in Propanol / Ethylene Glycol (v / v, 2 / 1)

[0039] The metal porphyrin complex used for photosensitizer in the present embodiment is PdTPP, molecular structural formula is:

[0040]

[0041] The 9,10-disubstituted anthracene derivative used as the luminescent agent in this example is DPA, and its molecular structural formula is:

[0042]

[0043] Pipette 40 µL of photosensitizer solution (CHCl 3 , 1×10 -3 mol / L) and 240 μL of luminescent agent solution (DMF, 5×10 - 2 mol / L) into a 5mL volumetric flask, add propanol / ethylene glycol (v / v, 2 / 1) mixed solvent and carefully oscillate to mix, sonicate, and finally slowly add propanol / ethylene glycol (v / v, 2 / 1) dropwise v, 2 / 1) The mixed solvent was fixed to volume, and 5 mL of photosensitizer and luminescent agent were prepared into an upconversion mixed solution with a molar ratio of 1:300. Under weak light field (wavelength is 532 nm, excitation light energy den...

Embodiment 2

[0044] The preparation of PdTPP / DPA up-conversion system in the embodiment dipropanol / ethylene glycol (v / v, 1 / 1)

[0045] Pipette 40 µL of photosensitizer solution (CHCl 3 , 1×10 -3 mol / L) and 240 μL of luminescent agent solution (DMF, 5×10 - 2 mol / L) into a 5mL volumetric flask, add propanol / ethylene glycol (v / v, 1 / 1) mixed solvent and carefully oscillate to mix, sonicate, and finally add propanol / ethylene glycol (v / v, 1 / 1) dropwise slowly v, 1 / 1) The mixed solvent was fixed to volume, and 5 mL of photosensitizer and luminescent agent were prepared into an up-conversion mixed solution with a molar ratio of 1:300. Under weak light field (wavelength is 532 nm, excitation light energy density is 60 mW×cm -2 ) can obtain blue upconversion fluorescence, and its efficiency can reach 25.4%.

Embodiment 3

[0046] The preparation of PdTPP / DPA up-conversion system in the embodiment tripropanol / ethylene glycol (v / v, 1 / 2)

[0047] Pipette 40 µL of photosensitizer solution (CHCl 3 , 1×10 -3 mol / L) and 240 μL of luminescent agent solution (DMF, 5×10 - 2 mol / L) into a 5mL volumetric flask, add propanol / ethylene glycol (v / v, 1 / 2) mixed solvent and carefully shake and mix, sonicate, and finally slowly add propanol / ethylene glycol (v / v, 1 / 2) v, 1 / 2) The mixed solvent was fixed to volume, and 5mL of photosensitizer and luminescent agent molar ratio was prepared into an upconversion mixed solution of 1:300. Under weak light field (wavelength is 532 nm, excitation light energy density is 60 mW×cm -2 ) can obtain blue upconversion fluorescence, and its efficiency can reach 29.1%.

[0048] attached figure 1 For the above-mentioned photosensitizer PdTPP in the protic solvent propanol / ethylene glycol (v / v, 2 / 1), propanol / ethylene glycol (v / v, 1 / 1) and propanol / ethylene glycol (v / UV-Vis a...

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Abstract

The invention belongs to the field of nonlinear optical materials and particularly discloses an efficient green dim light upconversion system based on a protic solvent. The sensitizer triplet state energy level can be improved simply and efficiently through proton media. Under the excitation of low power density green rays (532 nm, 60mW.cm<-2>), blue upconversion fluorescence is obtained in a PdTPP / DPA / propanol / ethylene glycol (v / v, 1 / 2) (a protic solvent) system, and the upconversion efficiency (phi UC) is as high as 29.1%. The convenient thinking is provided for improving triplet state-triplet state annihilation upconversion conversion, the solvent micro-environment effect is utilized, and thus the complexity of an ordinary organic synthesis method and the disadvantage for ecological environmental protection are avoided. The efficient green dim light upconversion system can be used for photoelecrochemical hydrogen production and has potential application values in the techical fields such as photovoltaics, solar photocatalysis and environmental photochemistry.

Description

technical field [0001] The invention belongs to the field of nonlinear optical materials, and in particular relates to a high-efficiency weak-light upconversion system which uses a protic solvent as a medium and contains a certain proportion of a photosensitizer and a luminescent agent. Background technique [0002] Up-conversion based on organic photonic materials is the process of using organic molecules to absorb low-energy light and then emit high-energy light, so that the process of converting long-wavelength light to short-wavelength light is simply realized. Currently, there are two technologies for organic photon upconversion: one is Two-Photon-Absorption Upconversion (TPA-UC), and the other is triplet-triplet-annihilation upconversion (Triplet-Triplet-UC). AnnihilationUpconversion, TTA-UC). Since the intensity of TPA-UC fluorescence and TTA-UC fluorescence has a quadratic relationship with the intensity of excitation light, both TPA-UC and TTA-UC exhibit nonlinear ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06
Inventor 叶常青王筱梅朱赛江王晶晶郝荣康周立伟
Owner SUZHOU UNIV OF SCI & TECH
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