Photoluminescence Quenching and Photoconductivity in Devices Using 3,6-Diaryl-N-hexylcarbazole

Photocarrier generation mechanisms in 3,6-diaryl-N-hexylcarbazole (aryl = p-cyanophenyl and p-acetophenyl) were studied in single-layer, bilayer, and blend film devices in sandwich geometry between indium–tin oxide (ITO) and Al electrodes. Bilayer and blend film devices were made with N,N′-diphenyl-...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2012-01, Vol.116 (1), p.1298-1306
Main Authors: Ali, Farman, Periasamy, N, Patankar, Meghan P, Narasimhan, K. L
Format: Article
Language:English
Subjects:
Applied sciences
C: Electron Transport, Optical and Electronic Devices, Hard Matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Electronic transport in condensed matter
Electronics
Exact sciences and technology
Excitons and related phenomena
Materials
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Photoconduction and photovoltaic effects
photodielectric effects
Photoluminescence
Physics
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Summary:Photocarrier generation mechanisms in 3,6-diaryl-N-hexylcarbazole (aryl = p-cyanophenyl and p-acetophenyl) were studied in single-layer, bilayer, and blend film devices in sandwich geometry between indium–tin oxide (ITO) and Al electrodes. Bilayer and blend film devices were made with N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD). Photoluminescence (PL) was strongly quenched by electric field. The photocurrent versus electric field plots and photoresponse action spectra were used to identify the source of photocarrier generation (interface versus bulk) in the three devices. In blend devices, the photocurrent density is directly proportional to PL quenching efficiency, indicating efficient carrier generation and collection in these devices. PL quenching and photocurrent results were fitted to theoretical equations to obtain material parameters such as exciton binding energy, exciton dissociation rate at zero field, PL quenching efficiency at zero field, and carrier mobility-lifetime product. The device properties of the two carbazole derivatives are suitable for visible-blind UV photodetectors.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp209586r