Impedance-based temperature measurement method for organic light-emitting diodes (OLEDs)

L.H.J. Raijmakers, M. Büchel, P.H.L. Notten

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
1 Downloads (Pure)

Abstract

This short communication presents a method to measure the integral temperature of organic light-emitting diodes (OLEDs). Based on electrochemical impedance measurements at OLEDs, a non-zero intercept frequency (NZIF) can be determined which is related to the OLED temperature. The NZIF is defined as the frequency at which the imaginary part of the impedance is equal to a predefined (non-zero) constant. The advantage of using an impedance-based temperature indication method through an NZIF is that no hardware temperature sensors are required and that temperature measurements can be performed relatively fast. An experimental analysis reveals that the NZIF is clearly temperature dependent and, moreover, also DC current dependent. Since the NZIF can readily be measured this impedance-based temperature indication method is therefore simple and convenient for many applications using OLEDs and offers an alternative for traditional temperature sensing.

Original languageEnglish
Pages (from-to)26-29
Number of pages4
JournalMeasurement: Journal of the International Measurement Confederation
Volume123
DOIs
Publication statusPublished - 1 Jul 2018

Fingerprint

Organic light emitting diodes (OLED)
Temperature measurement
temperature measurement
light emitting diodes
impedance
Temperature
temperature
indication
impedance measurement
temperature sensors
Temperature sensors
hardware
direct current
communication
Hardware
Communication

Keywords

  • Electrochemical impedance spectroscopy
  • Organic light emitting diode
  • Temperature measurement

Cite this

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abstract = "This short communication presents a method to measure the integral temperature of organic light-emitting diodes (OLEDs). Based on electrochemical impedance measurements at OLEDs, a non-zero intercept frequency (NZIF) can be determined which is related to the OLED temperature. The NZIF is defined as the frequency at which the imaginary part of the impedance is equal to a predefined (non-zero) constant. The advantage of using an impedance-based temperature indication method through an NZIF is that no hardware temperature sensors are required and that temperature measurements can be performed relatively fast. An experimental analysis reveals that the NZIF is clearly temperature dependent and, moreover, also DC current dependent. Since the NZIF can readily be measured this impedance-based temperature indication method is therefore simple and convenient for many applications using OLEDs and offers an alternative for traditional temperature sensing.",
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Impedance-based temperature measurement method for organic light-emitting diodes (OLEDs). / Raijmakers, L.H.J.; Büchel, M.; Notten, P.H.L.

In: Measurement: Journal of the International Measurement Confederation, Vol. 123, 01.07.2018, p. 26-29.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Impedance-based temperature measurement method for organic light-emitting diodes (OLEDs)

AU - Raijmakers, L.H.J.

AU - Büchel, M.

AU - Notten, P.H.L.

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AB - This short communication presents a method to measure the integral temperature of organic light-emitting diodes (OLEDs). Based on electrochemical impedance measurements at OLEDs, a non-zero intercept frequency (NZIF) can be determined which is related to the OLED temperature. The NZIF is defined as the frequency at which the imaginary part of the impedance is equal to a predefined (non-zero) constant. The advantage of using an impedance-based temperature indication method through an NZIF is that no hardware temperature sensors are required and that temperature measurements can be performed relatively fast. An experimental analysis reveals that the NZIF is clearly temperature dependent and, moreover, also DC current dependent. Since the NZIF can readily be measured this impedance-based temperature indication method is therefore simple and convenient for many applications using OLEDs and offers an alternative for traditional temperature sensing.

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