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A kind of fluorescent material and preparation method and application

A technology of fluorescent materials and fluorescent dopants, applied in the fields of luminescent materials, chemical instruments and methods, semiconductor/solid-state device manufacturing, etc., can solve the saturation threshold and efficiency reduction of luminescence, the low efficiency of two-photon excitation fluorescence, and the attenuation of luminous efficiency and other problems, to achieve the effect of extremely high quantum yield of photoluminescence, remarkable two-photon properties, and high degree of overlap

Active Publication Date: 2022-07-26
SHANDONG UNIV
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  • Abstract
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Problems solved by technology

However, the inventors found that compared with single-photon excitation of fluorescence, the efficiency of two-photon excitation of fluorescence is low, so the development of two-photon absorption materials with high efficiency and easy fabrication is an urgent problem to be solved at present.
[0005] In addition, when the injection energy intensity increases, the concentration of excitons and carriers increases. If the fluorescence lifetime is too long to emit light, saturation will occur due to triplet-triplet annihilation and triplet-polaron quenching mechanisms. The effect annihilates the excitons, resulting in uneven luminescence, poor spectral stability, and attenuation of luminous efficiency
The inventors also found that the current two-photon absorbing materials still have the problems of longer fluorescence lifetime, lower saturation threshold and reduced efficiency of luminescence

Method used

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  • A kind of fluorescent material and preparation method and application
  • A kind of fluorescent material and preparation method and application
  • A kind of fluorescent material and preparation method and application

Examples

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preparation example Construction

[0036] In one or more embodiments of the present invention, a method for preparing a fluorescent material includes the following steps:

[0037] The donor material, the acceptor material, and the fluorescent dopant material are mixed and dissolved in a benign solvent, and stirred evenly at room temperature to obtain a clear solution; then the mixed drop is cast on the carrier, and the temperature is raised for annealing. The preparation method is simple and efficient, and a sample film with a larger thickness can be prepared.

[0038] The benign solvent is selected from acetonitrile, dimethyl sulfoxide, N,N-dimethylformamide or tetrahydrofuran solution; preferably, it is tetrahydrofuran. In tetrahydrofuran solution, it is beneficial to achieve high dispersion of different materials, and will not lead to the denaturation of the material itself, which is beneficial to promote the uniform and efficient doping of fluorescent dopants in exciplexes, and is beneficial to play host, ...

Embodiment 1

[0045] Preparation of exciplex material systems without fluorescent dopants:

[0046] The donor material (TAPC), acceptor material (PBD), and benign solvent (tetrahydrofuran) provided in this example were directly purchased from a reagent company.

[0047] The preparation method is as follows:

[0048] 1) Weigh 62.6 mg (0.1 mol) of TAPC and 35.4 mg (0.1 mol) of PBD, mix them and dissolve them together in 10 ml of tetrahydrofuran solvent, add magnets and place them on a magnetic stirring table to stir overnight to obtain a clear mixture;

[0049] 2) After stopping stirring, take a clean quartz piece and place it horizontally, and use a dropper to cast the mixed droplet on the quartz piece;

[0050] 3) Place the quartz plate bearing the sample on a hot stage and anneal at 50° C. for 20 minutes to obtain an undoped exciplex material film, which is marked as TAPC / PBD.

Embodiment 2

[0052] Preparation of green fluorescent dopant-doped exciplex material system:

[0053] The donor material (TAPC), acceptor material (PBD), green fluorescent dopant (TTPA), and benign solvent (tetrahydrofuran) provided in this example were directly purchased from a reagent company.

[0054] The preparation method is as follows:

[0055] 1) Weigh out 62.6 mg (0.1 mol) of TAPC, 35.4 mg (0.1 mol) of PBD, and 2.0 mg of TTPA, wherein by mass fraction, TTPA / (TAPC+PBD+TTPA)=2%, mix them together Dissolve in 10ml of tetrahydrofuran solvent, add magnetron, put it on a magnetic stirring table and stir overnight to obtain a clear mixed solution;

[0056] 2) After stopping stirring, take a clean quartz piece and place it horizontally, and use a dropper to cast the mixed droplet on the quartz piece;

[0057] 3) Place the quartz plate bearing the sample on a hot stage and anneal at 50° C. for 20 minutes to obtain an exciplex film doped with a green fluorescent agent, which is marked as TA...

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Abstract

The invention belongs to the technical field of organic light-emitting materials, and relates to a fluorescent material, a preparation method and application thereof. The fluorescent material is an excimer compound doped with a fluorescent dopant; the fluorescent dopant is 9,10-bis[ N,N-bis-(p-tolyl)-amino]anthracene or 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethylgiuroni Quanyl-9-alkenyl)-4H-pyrene; the donor of the exciplex is 4,4'-cyclohexylbis[N,N-bis(4-methylphenyl)aniline]; the The receptor for the exciplex is 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole. The fluorescent material can achieve complete transfer of the luminescence peak with a very low concentration (<2wt.%) of dopants, the photoluminescence quantum yield is close to 100%, and can achieve strong up-conversion under the excitation of long-wavelength near-infrared laser light Two-photon fluorescence. At the same time, the fluorescence lifetime of the fluorescent material is shortened by nearly 90% compared with the prior art, which greatly improves the luminescence saturation effect and efficiency of the material, and is an important progress compared with the existing fluorescent material.

Description

technical field [0001] The invention belongs to the technical field of organic light-emitting materials, and relates to a fluorescent material and a preparation method and application thereof. Background technique [0002] The disclosure of information in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] An exciplex system is an excited state of intermolecular charge transfer formed between an electron donor molecule and an electron acceptor molecule. Compared with intramolecular charge transfer materials, exciplexes can easily modulate the energy levels of each other without chemical synthesis, resulting in thermally activated delayed fluorescence effect at room temperature. The thermally activated delayed fluorescence mechanism...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/06H01L51/54H01L51/50
CPCC09K11/06C09K11/02C09K2211/1011C09K2211/1029C09K2211/1088H10K85/653H10K85/615H10K85/631H10K85/6565H10K85/6572H10K50/12
Inventor 庞智勇杜慧恬韩圣浩
Owner SHANDONG UNIV
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