Magnetic field effect in organic light emitting diodes based on donor-acceptor exciplexes showing thermally activated delayed fluorescence

S. Baniya; Z. Pang; D. Sun; T. Basel; Y. Zhai; O. Kwon; H. Choi; Z. V. Vardeny

doi:10.1117/12.2249508

23 September 2016 Magnetic field effect in organic light emitting diodes based on donor-acceptor exciplexes showing thermally activated delayed fluorescence

S. Baniya, Z. Pang, D. Sun, T. Basel, Y. Zhai, O. Kwon, H. Choi, Z. V. Vardeny

Author Affiliations +

Proceedings Volume 9941, Organic Light Emitting Materials and Devices XX; 99410H (2016) https://doi.org/10.1117/12.2249508
Event: SPIE Organic Photonics + Electronics, 2016, San Diego, California, United States

Abstract

A new type of organic light-emitting diode (OLED) has emerged that shows enhanced operational stability and large internal quantum efficiency approaching 100%, which is based on exciplexes in donor-acceptor (D-A) blends having thermally activated delayed fluorescence (TADF) when doped with fluorescent emitters. We have investigated magnetoelectroluminescence (MEL) and magneto-conductivity in such TADF-based OLEDs, as well as magnetophotoluminescence (MPL) in thin films based on the OLEDs active layers, with various fluorescence emitters. We found that both MEL and MPL responses are thermally activated with substantially lower activation energy compared to that in the pristine undoped D-A exciplex host blend. In addition, both MPL and MEL steeply decrease with the emitters’ concentration. This indicates the existence of a loss mechanism, whereby the triplet charge-transfer state in the D-A exciplex host blend may directly decay to the lowest, non-emissive triplet state of the additive fluorescent emitter molecules.

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S. Baniya, Z. Pang, D. Sun, T. Basel, Y. Zhai, O. Kwon, H. Choi, and Z. V. Vardeny "Magnetic field effect in organic light emitting diodes based on donor-acceptor exciplexes showing thermally activated delayed fluorescence", Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 99410H (23 September 2016); https://doi.org/10.1117/12.2249508

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KEYWORDS

Molecules

Organic light emitting diodes

Luminescence

Electroluminescence

Excitons

Magnetism

Fluorescence resonance energy transfer

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