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Latest discovery! Reversible hydrogen energy for high efficiency OLED
Adddate:2017-09-08 17:24????Hits:

 New research shows that molecules that alter their chemical structure slightly before and after launch can provide a novel and stable way to achieve efficient OLEDs.

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 Reversible mechanism research involving hydrogen atom transfer - transfer - transfer the cation from a nuclear atomic emission in the molecule to another atom in the same molecule, to have the benefit of thermally activated delayed fluorescence (TADF) environment.

The current molecular design of TADF materials is focused on the combination of donor and recipient units. But the Japanese Kyushu University organic Photonics and Electronics Research Center (OPERA) researchers put forward a kind of excited state intramolecular proton transfer (ESIPT) based on the method to realize the effective TADF, and is not dependent on the donor acceptor scheme.
When the emitting molecules are excited by light or electricity, spontaneous ESIPT occurs.
Quantum chemical calculations by researchers show that TADF is not possible until hydrogen atoms are transferred. After hydrogen is transferred to different atoms in the same molecule, it forms a molecular structure that produces TADF. After the molecule emits light, the hydrogen is transferred back to its initial atom. Then the molecule is ready to start repeating the process.
ESIPT leads to highest occupancy and lowest unoccupied molecular orbital separation, thus achieving TADF emission with luminous efficiency close to 60百分比. The high external electroluminescent quantum efficiency of OLEDs using this emitter TADF is as high as 14百分比, indicating that effective triplet harvesting effect can be achieved using ESIPT based material.
The researchers said it was the first demonstration of an efficient TADF that was observed inside and outside the device.
The molecules used in the study were originally synthesized for the production of light absorbing pigments.
This research could expand and speed up the development of various TADF materials for high-performance OLEDs.
It is only now beginning to explore the advantages of the design strategy, but one of the particularly promising areas is related to its stability. It is known that molecules similar to those studied in this study are highly resistant to degradation, so the researchers hope that these molecules will help improve the life of OLEDs.

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