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Thermal active delay fluorescent (TADF) compound and applications thereof

A fluorescent compound, thermal activation delay technology, applied in the direction of silicon organic compounds, compounds of group 4/14 elements of the periodic table, luminescent materials, etc., can solve the problem of the reduction of the optical radiation transition rate of TADF materials, the device stability needs to be improved, The problem of limited material types can achieve the effect of increasing the electronic transition rate constant, improving the carrier balance, and improving the luminous performance

Inactive Publication Date: 2019-04-19
AAC TECH NANJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are still many deficiencies in such TADF-based materials and OLED devices, such as limited types of materials, and the stability of the devices needs to be improved.
For example, to achieve ΔE ST (The energy level difference between the singlet

Method used

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  • Thermal active delay fluorescent (TADF) compound and applications thereof
  • Thermal active delay fluorescent (TADF) compound and applications thereof
  • Thermal active delay fluorescent (TADF) compound and applications thereof

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[0039] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the various embodiments of the present invention will be described in detail below. However, a person of ordinary skill in the art can understand that, in each embodiment of the present invention, many technical details are proposed for the reader to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions required by the claims of the present invention can be realized.

[0040] Compound

[0041] The specific embodiment of the present invention provides a thermally activated delayed fluorescence compound, which has a structure represented by formula (I) or formula (II):

[0042]

[0043] among them,

[0044] X 1 , X 2 O or X 1 , X 2 Is S;

[0045] R 1 , R 2 Is a hydrogen atom;

[0046] D has the structure shown in formula (III):

[0047]

[0048] In for...

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Abstract

The invention relates to the technical field of organic electroluminescent devices, and discloses a thermal active delay fluorescent (TADF) compound and applications thereof. The energy level difference between the singlet state and triplet state of the provided TADF compound is less than or equal to 300 meV; the inverse gap crossing possibility from triplet exiton to singlet exiton is increased;furthermore, when a low energy level difference between the singlet state and triplet state is maintained, the TADF compound has high electron transition (S1 to S0) oscillator strength, thus TADF compound has high optical radiation transition rate, and the luminous efficiency of the TADF compound is improved.

Description

Technical field [0001] The present invention relates to the technical field of organic electroluminescence devices, in particular to a thermally activated delayed fluorescence compound and its application. Background technique [0002] Organic electroluminescence can be divided into fluorescence and phosphorescence electroluminescence. According to the theory of spin quantum statistics, the formation probability ratio of singlet excitons and triplet excitons is 1:3, that is, singlet excitons only account for 25% of "electron-hole pairs". Therefore, the fluorescence from the radiation transition of the singlet excitons only accounts for 25% of the total input energy, while the electroluminescence of phosphorescent materials can utilize the energy of all excitons through the heavy metal effect, which has greater advantages . Most of the current phosphorescent electroluminescent devices adopt a host-guest structure, that is, the phosphorescent luminescent material is doped into th...

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Application Information

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IPC IPC(8): C07D519/00C07F7/08C09K11/06H01L51/50H01L51/54
CPCC09K11/06C07D519/00C07F7/0816C09K2211/1007C09K2211/1029C09K2211/1088C09K2211/1092C09K2211/1096H10K85/6576H10K85/6574H10K85/6572H10K85/657H10K85/40H10K50/11
Inventor 谢再锋
Owner AAC TECH NANJING