Changing inter-molecular spin-orbital coupling for generating magnetic field effects in phosphorescent organic semiconductors

• Author(s): Yan, Liang ; Shao, Ming ; Graeff, Carlos Frederico de Oliveira [UNESP] ; Hummelgen, Ivo ; Ma, Dongge ; Hu, Bin
• Date: 2014
• Persistent ID: http://hdl.handle.net/11449/8524
• Origin: Oasisbr
• Document Type: Journal article
• Language: English

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U.S. NSF

China NSF

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Phosphorescent organic semiconductors normally show negligible magnetic field effects in electronic and optic responses. These phenomena have been generally attributed to strong spin-orbital coupling which can dominate internal spin-dephasing process as compared with applied magnetic field. This paper reports both positive and negative magnetocurrents from phosphorescent organic semiconductors through dissociation and charge-reaction channels when the intermolecular spin-orbital coupling is changed based on materials mixing. Our experimental results indicate that inter-molecular spin-orbital coupling is essentially responsible for the generation of magnetic field effects in phosphorescent organic semiconductors. (C) 2012 American Institute of Physics. [doi:10.1063/1.3673561]

Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

Univ Estadual Paulista UNESP, Dept Fis FC, BR-17033360 Bauru, Brazil

Univ Fed Parana, Dept Fis, BR-81531980 Curitiba, Parana, Brazil

Changchun Inst Appl Chem, Changchun 130022, Peoples R China

Huazhong Univ Sci & Technol, Wu Han Natl Lab Optoelect, Wuhan, Peoples R China

Univ Estadual Paulista UNESP, Dept Fis FC, BR-17033360 Bauru, Brazil

NSF: ECCS-046645

U.S. NSF: OISE-0929566

China NSF: 50928302