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Dendritic polymer structure based triplet-triplet annihilation upconversion luminescent material

A triplet annihilation, luminescent material technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of low doping, inhibition, aggregation and diffusion of photosensitizers and annihilation agents, etc. Good capacitive effect

Active Publication Date: 2016-09-28
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, photosensitizers and annihilation agents are prone to aggregation in solids, resulting in very low doping levels; in addition, the diffusion of photosensitizers and annihilation agents in solids is greatly inhibited, which reduces the energy transfer efficiency and annihilation of photosensitizers and annihilation agents. The annihilation efficiency of the agent molecule ultimately leads to the fact that upconversion can only be realized above the glass transition temperature of the polymer, and the upconversion luminescence quantum efficiency is low, which greatly limits the practical application of TTA upconversion
[0006] In order to realize the practical application of TTA upconversion, it is necessary to solve the problem that the photosensitizer and annihilation agent are easy to aggregate and the diffusion in the solid is inhibited.

Method used

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  • Dendritic polymer structure based triplet-triplet annihilation upconversion luminescent material

Examples

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Embodiment 1

[0060] Doping preparation of triplet-triplet annihilation upconversion luminescent materials based on dendrimer structure:

[0061] 1. Synthesis of an annihilation agent G1-DPA with a dendritic structure of the first generation

[0062] (1) Synthesis of aryl ether dendrimer G1

[0063] Put 5.3g of 3,5-dihydroxybenzyl alcohol, 20g of bromobenzyl bromide, 35g of potassium carbonate and a catalytic amount of 18-C-6 in a 250mL three-necked flask, add about 150mL of dry acetone, and stir and reflux the reaction under a nitrogen atmosphere 10h. Stop the reaction and cool to room temperature, filter under reduced pressure to remove the solid potassium carbonate, and spin the filtrate to remove the solvent under reduced pressure. The spin-dried solid was dissolved in dichloromethane and washed with water to remove 18-C-6. The organic phase was dried with anhydrous magnesium sulfate and filtered, and the filtrate was spin-dried under reduced pressure to obtain a crude product. The c...

Embodiment 2

[0074] Doping preparation of triplet-triplet annihilation upconversion luminescent materials based on dendrimer structure:

[0075] 1. Synthesis of annihilation agent G2-DPA with 2nd generation dendritic structure

[0076] (1) Synthesis of aryl ether dendrimer G2

[0077] Take 1.0 equivalent of G1 prepared in Example 1 and place it in a three-necked flask, dissolve it with a minimum amount of redistilled THF, add 1.25 equivalents of carbon tetrabromide and 1.25 equivalents of triphenylphosphine under a nitrogen atmosphere, and Stir the reaction for 5 minutes, and monitor the progress of the reaction with TLC. If the raw materials are not completely reacted, add the same equivalent of carbon tetrabromide and triphenylphosphine until the raw materials are completely reacted. After the reaction was complete, water was added to the reaction solution to quench the reaction, the water phase was removed by liquid separation, the organic phase was dried with anhydrous magnesium sulfa...

Embodiment 3

[0086] Doping preparation of triplet-triplet annihilation upconversion luminescent materials based on dendrimer structure:

[0087] 1. Synthesis of annihilation agent G3-DPA with 3rd generation dendritic structure

[0088] (1) Synthesis of aryl ether dendrimer G3

[0089] Get G2 prepared in Example 2, prepare G2-Br according to the method for synthesizing G1-Br in Example 2, and the gained crude product is separated by column chromatography (eluent is dichloromethane / petroleum ether=1 / 1) , the white solid product G2-Br was finally obtained with a yield of 89%. 1 H NMR (400MHz, CDCl 3 ,ppm): δ=7.49(d,J=8.4Hz,8H),7.27(d,J=8.5Hz,8H),6.63(d,J=2.2Hz,4H),6.60(d,J=2.2Hz , 2H), 6.50(t, J=2.2Hz, 2H), 6.47(t, J=2.2Hz, 1H), 4.98(s, 8H), 4.95(s, 4H), 4.40(s, 2H).

[0090] G2-Br and 3,5-dihydroxybenzyl alcohol were prepared according to the method for synthesizing G1 in Example 1 to prepare G3. After the crude product was separated by column chromatography (eluent was dichloromethane),...

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Abstract

The invention discloses a dendritic polymer structure based triplet-triplet annihilation upconversion luminescent material, and relates to the technical field of photon upconversion. The upconversion luminescent material comprises a dendrite structure based annihilation agent formed by covalent modification of 9, 10-diphenylanthracene (DPA) on the periphery of an aromatic ether dendrite polymer. The upconversion luminescent material provided by the invention can realize the upconversion luminescence under the condition of low excitation light power density in a solution and solid, and is a novel upconversion luminescent material.

Description

technical field [0001] The invention relates to the technical field of photon up-conversion. More specifically, it relates to a triplet-triplet annihilation upconversion luminescent material based on a dendrimer structure. Background technique [0002] Photon up-conversion is a special technology that can convert low-energy photons into high-energy photons, that is, to achieve anti-Stokes shift luminescence. This special performance makes it important in the fields of biological imaging, solar cells, and photocatalysis. potential application value. At present, photon upconversion has been realized in organic two-photon absorbing dyes, rare earth doped nanocrystals, and triplet-triplet annihilation upconversion systems. However, due to the small absorption cross-section of two-photon absorbing dyes, coherent light sources with high power density (laser light sources, ~10 6 W / cm 2 ) to achieve up-conversion; rare earth-doped nanocrystals have a small absorption cross-secti...

Claims

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Application Information

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IPC IPC(8): C09K11/06C09K11/02C08G83/00
CPCC08G83/003C09K11/025C09K11/06C09K2211/1416C09K2211/1433C09K2211/185
Inventor 李嫕高佳敏曾毅陈金平于天君
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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