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• W3137317810 abstract "Recent studies have shown that 2,3,5,6-tetrakis(3,6-diphenylcar-bazol-9-yl)-1,4-dicyanobenzene (4CzTPN-Ph) is a typical intramolecular charge-transfer (CT) material, and its magneto-electroluminescence (MEL) could be well applied to probe the microscopic mechanism of device luminescence. In this work, three kinds of devices were fabricated using the host materials of broadband gap electron donor 2,4,6-Tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (PO-T2T), broadband gap electron acceptor 4,4′,4′′-Tri(9-carbazoyl)triphenylamine (TCTA), and intermolecular CT state material (exciplex TCTA:PO-T2T) doped with the guest material 4CzTPN-Ph. The MEL curves at various temperatures, currents, and concentrations were measured. At room temperature, it was found that when the host materials were PO-T2T and TCTA, respectively, their MEL amplitude showed completely opposite current dependence. That is, the MEL amplitude of the former increased with the increase of current (abnormal current dependence), while the amplitude of the latter decreased with the increase of current (normal current dependence). When the intermolecular CT state material TCTA:PO-T2T was used as the host material, if the concentration of the guest 4CzTPN-Ph was small, the current-dependent MEL amplitude was consistent with the device whose host material was TCTA. When the 4CzTPN-Ph concentration was high, it was consistent with the device whose host material was PO-T2T. By fully analyzing the energy level structure of the three devices, the emission spectra of the host materials, and the absorption spectra of the guest material, we proposed that the current dependence of the MEL amplitude of these devices was caused by energy the transfer process and carrier trap effect. Moreover, for TCTA:PO-T2T as the host material of the device, the MEL amplitude at various concentrations of 4CzTPN-Ph at 20 K showed a similar current dependence to that obtained at room temperature. This further proved the correctness of the exciton emission mechanism proposed for this kind of CT device. Clearly, this study will be helpful to further understanding the evolutionary process of the microscopic mechanism for devices based on the 4CzTPN-Ph luminescence material." @default.
• W3137317810 created "2021-03-29" @default.
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• W3137317810 date "2019-11-21" @default.
• W3137317810 modified "2023-09-23" @default.
• W3137317810 title "Abnormal current-dependent behaviors of the magneto-electroluminescence from charge-transfer excitons" @default.
• W3137317810 doi "https://doi.org/10.1360/sst-2019-0096" @default.
• W3137317810 hasPublicationYear "2019" @default.
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