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Long-afterglow luminescent material based on quantum dot sensitization and application thereof

A long-lasting luminescence and quantum dot sensitization technology, which is applied in the direction of luminescent materials, applications, nanotechnology for materials and surface science, etc., can solve the difficult problems of efficient conduction of quantum dot energy and achieve good controllability Effect

Active Publication Date: 2020-06-19
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the construction of long afterglow materials based on semiconductor sensitization still faces many challenges, mainly because it is difficult to conduct the energy of quantum dots efficiently.

Method used

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  • Long-afterglow luminescent material based on quantum dot sensitization and application thereof
  • Long-afterglow luminescent material based on quantum dot sensitization and application thereof
  • Long-afterglow luminescent material based on quantum dot sensitization and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A long-lasting luminescent material based on quantum dot sensitization, which is represented by the following general formula:

[0034]Light absorbing agent (quantum dot)@(antenna molecule)||photochemical buffer||luminescent agent (luminescent molecule)

[0035] figure 1 It is a schematic diagram of the luminescent principle of the long-lasting luminescent material based on quantum dot sensitization in the embodiment of the present invention.

[0036] like figure 1 As shown, the luminescent principle of the long-lasting luminescent material based on quantum dot sensitization in the present invention is as follows: using the effective transfer of triplet energy between quantum dots and antenna molecules, the donor quantum The excited state energy of the point is transmitted through the antenna molecules, reacts with oxygen to produce singlet oxygen, and reacts with the photochemical buffer agent to store energy on the chemical bond, slowly release it to the luminescent...

Embodiment 2

[0045] A long-lasting luminescent material based on quantum dot sensitization, which coordinates PbS quantum dots with 5-TCA as a light absorbing agent, wherein PbS quantum dots are used as quantum dots, and 5-TCA is used as antenna molecules; the photochemical buffer is The luminescent agent is a Eu complex, and the specific structural formula is

[0046] figure 2 It is the afterglow spectrum diagram of PbS quantum dots with different emission wavelengths in Example 2 of the present invention.

[0047] like figure 2 As shown, PbS quantum dots with emission peaks at 951nm-1026nm can be used as light absorbing agents in the long-lasting luminescent material or luminescent system of this embodiment to achieve long-lasting luminescence, and the luminous intensity of PbS quantum dots emitted at 962nm is the highest. , this is related to the triplet energy level of the PbS quantum dots emitted at 962nm and the molecular energy level of the 5-TCA antenna. Therefore, the sensi...

Embodiment 3

[0066] A long-lasting light-emitting flexible polymer film, raw materials include PbS quantum dots, 5-carboxytetracene (5-TCA), photochemical buffering agent, Eu complex, methylene bis(4-cyclocarbonyl isocyanate) and polyester polyols. Wherein, the PbS quantum dots, the photochemical buffer and the Eu complex are the same as the PbS quantum dots, the photochemical buffer and the Eu complex selected in Example 2.

[0067] The preparation method of the long afterglow light-emitting flexible polymer film provided in this example is as follows:

[0068] S1, preparing a toluene solution of long-lasting luminescent materials, wherein the concentration of PbS quantum dots is 1×10 -6 mol / L, the concentration of 5-TCA is 3×10 -4 mol / L, the concentration of photochemical buffer is 5×10 -3 mol / L, the concentration of luminescent agent is 5×10 - 3 mol / L;

[0069] S2, add methylene bis(4-cyclocarbonyl isocyanate) and polyester polyol (toluene solution of long-lasting luminescent mate...

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Abstract

The invention provides a long-afterglow luminescent material based on quantum dot sensitization and an application thereof, and belongs to the field of luminescent materials. The long-afterglow luminescent material based on quantum dot sensitization, provided by the embodiment of the invention, comprises a light absorbing agent which comprises quantum dots and antenna molecules matched with the quantum dots in energy level and coordinated on the surfaces of the quantum dots and is used for interacting with oxygen to generate singlet oxygen under the action of exciting light, a photochemical buffer agent which is used for reacting with singlet oxygen and releasing energy, and a luminescence agent which is used for receiving energy and emitting light. The long-afterglow luminescent materialprovided by the invention can be excited by low-power-density light sources such as sunlight and fluorescent lamps to realize long-afterglow luminescence. The invention also provides an application ofthe long-afterglow luminescent material in a flexible film and a multicolor adjustable coding material. The invention also provides an application of the long-afterglow luminescent material in imaging in a living organism.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a long-lasting luminescent material based on quantum dot sensitization and its application. Background technique [0002] The luminescent principle of long-lasting luminescent materials belongs to photoluminescence, that is, when the excitation light source is removed, the excited state energy is slowly released in the form of light and presents a phenomenon of persistent luminescence (lifetime greater than 0.1s). Compared with traditional fluorescent materials, long afterglow materials still have the ability to continue to emit light after the excitation light stops exciting. This feature makes long afterglow materials widely used in the fields of night lighting instructions, energy storage, biological imaging and biological tracing. . [0003] Traditional long-lasting materials must be excited by high-energy ultraviolet rays or even X-rays, and ultraviolet rays or X-rays r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/00C09K11/02C09K11/06C09K11/66B82Y20/00B82Y30/00B82Y40/00C08L75/06C08K13/02C08K3/30C08K5/46C08K5/45C08J5/18C09D11/50C09D11/102G09F3/02B42D25/378
CPCB82Y20/00B82Y30/00B82Y40/00B42D25/378C08J5/18C08J2375/06C08K5/0091C08K5/46C08K13/02C08K2003/3009C09D11/102C09D11/50C09K11/00C09K11/025C09K11/06C09K11/661C09K11/665C09K2211/1007C09K2211/1011C09K2211/1088C09K2211/182G09F3/02
Inventor 李富友徐明周倩雯
Owner FUDAN UNIV
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