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Demonstration of the bipolar transport properties of NPB

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Demonstration of the bipolar transport properties of NPB Appl. Phys. Lett. 89, 262102 (2006) S.K. So and S.C. Tse Department of Physics and Centre for Advanced Luminescence Materials, HKBU, Hong Kong, China PS-C21 The seventh International Symposium on Functional π -Electron Systems Hong Kong Baptist University B. Electron only device A unipolar electron device was fabricated with configuration of ITO/BCP(20nm)/NPB(200nm)/Ca/Al. Fig.8 The EL spectra of devices (A), in black solid line; (B) in red dashed line. Blue dotted line is the PL of NPB. Devices energy diagram (in eV) were also shown. Fig.2 Configuration of the TOF setup and sample structure Experimental details A. Time-of-flight measurement Time-of-flight (TOF) measurement is the simple and clear technique to evaluate the carrier mobilities in the organic semiconductors. S.K. So e-mail: [email protected] & S.C. Tse e-mail: [email protected] Introduction & Aims N,N’-diphenyl-N,N’-bis(1-naphthyl)(1,1’-biphenyl)-4,4’diamine (NPB), an important organic hole transport for organic light-emitting diodes (OLEDs), is found to possess bipolar transport properties through: a) Time-of-flight (TOF) measurement b) Electron only device c)
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