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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| Published in: | Synthetic metals Vol. 154; no. 1; pp. 137 - 140 |
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| Format: | Journal Article Conference Proceeding |
| Language: | English |
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| Abstract | 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. |
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| AbstractList | 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 410K. 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. 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. |
| Author | Cheun, H. Winokur, M.J. |
| Author_xml | – sequence: 1 givenname: H. surname: Cheun fullname: Cheun, H. organization: Department of Materials Science, University of Wisconsin, Madison, WI, 53706 USA – sequence: 2 givenname: M.J. surname: Winokur fullname: Winokur, M.J. email: mwinokur@wisc.edu organization: Department of Physics, University of Wisconsin, Madison, WI, 53706 USA |
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| Cites_doi | 10.1063/1.1596722 10.1063/1.1637431 10.1002/cphc.200300942 10.1038/16393 10.1088/0953-8984/14/42/307 10.1063/1.1328095 10.1016/S0379-6779(02)00697-5 10.1002/polb.10659 10.1002/1521-4095(20020404)14:7<477::AID-ADMA477>3.0.CO;2-9 10.1103/PhysRevB.67.184106 10.1002/1521-4095(20020205)14:3<206::AID-ADMA206>3.0.CO;2-J 10.1038/347539a0 10.1021/ma990741o 10.1063/1.1430503 10.1002/pola.1266 |
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| Keywords | Liquid crystalline phase Other conjugated and/or conducting polymers Electroluminescence Photoluminescence Voltage current curve Thermotropic state Aromatic polymer Thermal cycle Temperature effect Fluorene derivative polymer Experimental study Light emitting diode Conjugated polymer Liquid crystal polymers Optical properties Current time characteristic |
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| Snippet | Both electroluminescence (EL) and photoluminescence from conventional poly(di-
n-octylfluorene) (PF8) light emitting diodes (LEDs) has been monitored
in situ... Both electroluminescence (EL) and photoluminescence from conventional poly(di-n-octylfluorene) (PF8) light emitting diodes (LEDs) has been monitored in situ... |
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| SubjectTerms | 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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