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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Voltage-controlled color change in polymer light-emitting diodes via thermochromism

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Title
Voltage-controlled color change in polymer light-emitting diodes via thermochromism
Author
Park, SHKim, Jin YoungKim, HLee, K
Keywords
Color adjustability; Polymer light emitting diodes; Thermochromism
Issue Date
2005-04
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.46, no.4, pp.1049 - 1052
Abstract
We report a reversible color change in polymer light-emitting diodes (PLEDs) fabricated with a single layer of poly [2-methoxy, 5-(2' ethyl-hexyloxy)-1, 4-phenylene vinylene] (MEH-PPV). When we varied the applied voltage from 10 to 19 V, the devices changed their emission color from an orange-red (similar to 590 nm) to a, greenish-yellow (similar to 560 nm). Moreover, this process was reversible. We attribute this to an operating voltage-induced thermochromism in the PLEDs. At higher voltages, the temperatures of the devices were elevated due to Joule heating, which altered the conformation of the polymers from rod-like to coil-like. This conformational change resulted in a lesser degree of planarity of the polymer backbone, thereby broadening the pi - pi* gap of the polymers.
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ISSN
0374-4884
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