Electroluminescence and photoluminescence in poly(di- n-octylfluorene) light-emitting diodes operated at elevated temperatures

Both electroluminescence (EL) and photoluminescence from conventional poly(di- n-octylfluorene) (PF8) light emitting diodes (LEDs) has been monitored in situ during thermal cycling at temperatures up to 410 K. Even after the PF8 polymer undergoes a thermotropic phase transition to a liquid crystal p...

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Veröffentlicht in:	Synthetic metals 2005-09, Vol.154 (1), p.137-140
Hauptverfasser:	Cheun, H., Winokur, M.J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Application fields Applied sciences Electroluminescence Electronics Exact sciences and technology Liquid crystalline phase Optoelectronic devices Other conjugated and/or conducting polymers Photoluminescence Polymer industry, paints, wood Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Technology of polymers
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container_title	Synthetic metals
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creator	Cheun, H. Winokur, M.J.
description	Both electroluminescence (EL) and photoluminescence from conventional poly(di- n-octylfluorene) (PF8) light emitting diodes (LEDs) has been monitored in situ during thermal cycling at temperatures up to 410 K. Even after the PF8 polymer undergoes a thermotropic phase transition to a liquid crystal phase these LEDs continue to operate although at reduced currents. This behavior is likely caused by changes in the hole transport layer and/or polymer interfaces and not by the phase transition itself. Overall EL output is diminished but PL measurements indicate no evidence of PF8 degradation. The step-wise thermal cycling of a working device produces a decrease in the relative EL efficiency at higher applied bias voltages but results in a pronounced EL efficiency increase at voltages near the device turn-on threshold. EL emission and measured device currents are both time- and temperature-dependent.
doi_str_mv	10.1016/j.synthmet.2005.07.035
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subjects	Application fields Applied sciences Electroluminescence Electronics Exact sciences and technology Liquid crystalline phase Optoelectronic devices Other conjugated and/or conducting polymers Photoluminescence Polymer industry, paints, wood Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Technology of polymers
title	Electroluminescence and photoluminescence in poly(di- n-octylfluorene) light-emitting diodes operated at elevated temperatures
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