Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS
Volume 41, Issue 10A, Pages L1122-L1125Publisher
INST PURE APPLIED PHYSICS
DOI: 10.1143/JJAP.41.L1122
Keywords
carrier mobility; organic transporting materials; hydroxyquinoline aluminum
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Optical time-of-flight (TOF) technique was used to measure the electron mobility of tris(8-hydroxyquinoline) aluminium (Alq(3)) exposed to different gases. When freshly prepared Alq3 sample was exposed to air, the TOF signal vas observed to be highly dispersive. After annealing the sample to 370 K for 12 h, the signal became non-dispersive. The field dependence of the electron mobility was found to exhibit Poole-Frenkel form between 250-380 K. The effects of various ambient gases (N-2, O-2, H2O) to the electron mobility were examined. It is found that O-2 acts as an extrinsic dopant and induces electron traps in bulk Alq(3).
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