Doped organic light emitting diodes having a 650-nm-thick hole transport layer
- 27 April 1998
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 72 (17), 2147-2149
- https://doi.org/10.1063/1.121304
Abstract
We have succeeded in fabricating a thick-film organic light emitting diode having a doped hole transport layer (DHTL). The basic cell structure is anode DHTL/emitter layer/cathode. The DHTL is composed of a hole transporting polycarbonate polymer (PC-TPB-DEG) and tris(4-bromophenyl)aminium hexachloroantimonate (TBAHA) as a dopant. As an emitter, we used tris(8-hydroxyquinoline) aluminum (Alq). With a 650-nm-thick DHTL, the device showed considerable reduction in cell resistance compared with an anode/nondoped HTL/Alq/cathode device with the same HTL thickness. Although the electroluminescent quantum efficiency ΦL was rather low in the doped device, we should be able to increase it by interposing a thin tetraphenylbendidine (TPB) layer between the DHTL and the emitter layer while keeping the driving voltage low. The anode/DHTL (650 nm)/TPB(50 nm)/Alq(50 nm)/cathode showed luminance of more than 4004 cd/m2 at 10.0 V and 220 mA/cm2.Keywords
This publication has 23 references indexed in Scilit:
- Polymer light-emitting electrochemical cells with frozen p-i-n junctionApplied Physics Letters, 1997
- Organic Electroluminescent DevicesScience, 1996
- Efficient blue light emitting devices based on rigid‐rod polyelectrolytesAdvanced Materials, 1996
- Efficient, fast response light-emitting electrochemical cells: Electroluminescent and solid electrolyte polymers with interpenetrating network morphologyApplied Physics Letters, 1996
- Voltage controlled two color light-emitting electrochemical cellsApplied Physics Letters, 1996
- Polymer Light-Emitting Electrochemical Cells: In Situ Formation of a Light-Emitting p−n JunctionJournal of the American Chemical Society, 1996
- Efficient Photoluminescence and Electroluminescence from a Soluble PolyfluoreneJournal of the American Chemical Society, 1996
- Polymer Light-Emitting Electrochemical CellsScience, 1995
- Multilayered organic electroluminescent device using a novel starburst molecule, 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine, as a hole transport materialApplied Physics Letters, 1994
- Polyaniline as a transparent electrode for polymer light-emitting diodes: Lower operating voltage and higher efficiencyApplied Physics Letters, 1994