Prof. Wei-Cheng Liu Profile

Prof. Wei-Cheng Liu

at National Chung Cheng Univ

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Proceedings Article | 1 August 2021 Presentation

The magnetic filed effect of the singlet fission reaction in polycrystalline tetracene-based diodes

Tzung-Fang Guo, Shi-Hong Lou, Wei-Cheng Liu, Chien-Chih Wu

Proceedings Volume 11808, 118080A (2021) https://doi.org/10.1117/12.2594167

KEYWORDS: Diodes, Magnetism, Luminescence, Excitons, Electroluminescence

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We characterize the magneto photocurrent (MPC) response in polycrystalline tetracene-based diodes and magneto photoluminescence of the tetracene film and attribute the initially decreasing and then increasing MPC responses to the feature of the singlet fission (SF) reaction. The SF reaction in polycrystalline tetracene active layer is more evident when the device was irradiated with the short wavelength of irradiation. This observation indicates a possible route to utilize the excess exciting energy for the generation of extra excited states (triplet) to contribute the higher photocurrent. Additionally, through the measurement of magneto electroluminescence of tetracene-based diodes operated under the forward bias regime, we are able to characterize the reaction of triplet-triplet annihilation (TTA) to harvest the energy from triplet to singlet excitons in part contribute the emission of fluorescence especially in the high current density and low temperature regime.

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