Organic electroluminescent material and application thereof
An electroluminescent material and luminescent technology, applied in luminescent materials, organic chemistry, circuits, etc., can solve the problems of unfavorable molecular luminescence efficiency, reduce the intensity of the light radiation transition constant array, increase, etc., and achieve the effect of a large radiation rate constant
Inactive Publication Date: 2019-06-07
AAC TECH NANJING
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Problems solved by technology
Although such traditional molecular design has obtained the ideal ΔE ST value, but the complete separation of HOMO and LUMO orbitals and the embedding of barrier units cause the integral of electron exchange between HOMO and LUMO in the molecule to approach 0, that is, the radiative transition rate constant Kr@S1->S in the molecule becomes smaller, Not conducive to the improvement of the luminous efficiency of molecules
In addition, the intermediate barrier unit makes the molecular structure more flexible, thereby reducing the light radiation transition constant of the molecule and the moment intensity during the transition (Kr is proportional to the moment intensity f)
Method used
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[0028] In order to make the purpose, technical solutions and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below. However, those of ordinary skill in the art can understand that in each implementation manner of the present invention, many technical details are proposed in order to enable readers to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed by each claim of the present invention can also be realized.
[0029] compound
[0030] The specific embodiment of the present invention provides an organic electroluminescent material, which has the structure shown in formula (I) or formula (II):
[0031]
[0032] in,
[0033] x 1 、X 2 Same as O or X 1 、X 2 Same as S;
[0034] R 1 , R 2 Each is independently a hydrogen atom, a deuterium atom, a halogen, a subst...
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Abstract
The invention relates to the technical field of organic light-emitting devices, and discloses an organic electroluminescent material and an application thereof. The organic electroluminescent materialprovided by the invention has a suitable hole transport rate and a suitable electron transport rate, and facilitates the balance of carriers in the OLEDs when used to produce the OLEDs. The organic electroluminescent material provided by the invention also has a high S1 to S0 electron transition oscillator strength which is equal to or more than 0.1 or even more than 2.0, so that the organic electroluminescent material has a higher optical radiation transition rate, and facilitates the improvement of the luminous efficiency of the devices.
Description
technical field [0001] The invention relates to the technical field of organic electroluminescent devices, in particular to an organic electroluminescent material and its application. Background technique [0002] Organic electroluminescent materials are classified into fluorescent electroluminescent materials and phosphorescent electroluminescent materials. Among them, phosphorescent electroluminescent materials can utilize the energy of all excitons through the heavy metal effect, so they have greater advantages. [0003] In 2009, a thermally activated delayed fluorescence material, namely TADF (Thermally activated delayed fluorescence) material, was proposed and applied in the technical field of organic electroluminescent devices. Under thermal excitation, this kind of fluorescent material can use the reverse gap crossing of triplet excitons to obtain 100% singlet excitons, which not only avoids the use of expensive heavy metal complexes, but also has a device efficiency...
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IPC IPC(8): C07D493/04C07D495/04C09K11/06H01L51/54
Inventor 谢再锋
Owner AAC TECH NANJING