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Study of magneto-electroluminescence and magneto-conductance in polymer light-emitting electrochemical cells
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FIG. 1.

(Color online) (a) The current (solid squares) and light emission intensity (open circles) as a function of the charging time during the cell activation process. The upper inset shows the chemical structures of TMPTMA and LiCF3SO3; the lower inset shows the device structures, and the p-i-n junction formed following the cell activation. (b) The current-brightness-voltage curves of PLEC devices at room temperature, after the cell activation. The inset shows the photoluminescence spectrum of the SY-PPV polymer of which chemical structure is given.

Image of FIG. 2.

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FIG. 2.

(Color online) (a) MEL(B) and (b) MC(B) room temperature responses of the PLEC at various bias voltages, V up to B = 120 mT. The lines through the data points are fits using a modified Lorentzian model (see text). B 1/2 is the HFHM of the response, as indicated. The insets show the low-field response of MEL and MC up to B = 3 mT, where B min ≈ 0.75 mT.

Image of FIG. 3.

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FIG. 3.

(Color online) (a) The voltage dependencies of MEL and MC at B= 120 mT. (b) and (c) The voltage dependencies of the parameters B 1/2 and B 0 for the MEL and MC responses, extracted from Figs. 2(a) and 2(b), respectively. The lines through the data points are linear fits to guide the eye.

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/content/aip/journal/apl/98/26/10.1063/1.3605251
2011-06-30
2014-04-16

Abstract

Magneto-electroluminescence (MEL) and magneto-conductance (MC) have been investigated in polymer light-emitting electrochemical cells based on “super-yellow” poly-(phenylene vynilene) (SY-PPV). We measured positive MEL(B) and MC(B) responses that show a modified Lorentzian shape for B < 120 mT. At B < 2 mT, both MEL(B) and MC(B) responses show a second component, opposite in sign to the higher field response. We interpret the magnetic field response using the polaron pair model, from which we extract the hyperfine interaction constant of polarons in the SY-PPV polymer.

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Scitation: Study of magneto-electroluminescence and magneto-conductance in polymer light-emitting electrochemical cells
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/26/10.1063/1.3605251
10.1063/1.3605251
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