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The chemical structures of the TF compounds.
EL spectra of devices based on the TF compounds in comparison with their thin-film PL spectra: (a) TPHF, (b) THPF.
EL efficiency vs applied voltage characteristics of devices A and B.
Luminance-voltage (square) and efficiency-voltage (star) characteristics of the device with structure of ITO/TCTA /rubrene /TPHF .
The electrochemical properties of the TF compounds and the EL characteristics of the devices.
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