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1 de junho de 2016

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Assessoria de Comunicação – IFSC/USP

11 de abril de 2016

Seminário do Instituto de Física – USP

Reaching 100% Efficient OLEDs

Converting Triplet Excitons Into Singlet States Without Spin Orbit Coupling

Prof. Dr. Andy Monkman – Organic Electroactive Materials Research Group – Department of Physics, Durham University, England

Organic light emitting diodes are now a common place technology, but increasing their internal efficiency to near 100% is difficult.

The main reason for this is that on charge recombination, 75% of excited states formed have triplet character and are non emissive.

At present iridium containing phosphors are used to harvest these states to produced light, but a new type of emitter has been developed that can also convert triplet to singlet states but without the need for a heavy metal or spin orbit coupling, Thermally Activated Delay Fluorescence; ‘TADF’.

In his talk, Monkman will describe the mechanisms that drive TADF and show how molecular design and careful energy level tuning give rise to 22% external quantum efficiency deep blue OLEDs. Throughout, new time resolved photophysical measurements will be explained and used to elucidate the physics behind TADF.