Impact of temperature on the efficiency of organic light emitting diodes

I.R. De Moraes; S. Scholz; M. Hermenau; M.L. Tietze; T. Schwab; S. Hofmann; M.C. Gather; K. Leo

doi:10.1016/j.orgel.2015.07.032

Impact of temperature on the efficiency of organic light emitting diodes

I.R. De Moraes, S. Scholz, M. Hermenau, M.L. Tietze, T. Schwab, S. Hofmann, M.C. Gather, K. Leo

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

Organic light emitting devices (OLEDs) are known to heat up when driven at high brightness levels required for lighting and bright display applications. This so called Joule heating can in the extreme case lead to a catastrophic failure (breakdown) of the device. In this work, we compare the effect of Joule heated and externally heated OLEDs by their electrical and optical response. A reduction in resistance is observed at elevated temperatures, both, for Joule heating, and for externally heated samples driven at low current density. In both cases, we attribute the change in resistance to a higher mobility of charge carriers at the elevated temperatures. Additionally, we observe a quenching of the emission efficiency in heated single layers as well as in OLEDs, treated with an external heat source as well as on Joule heated samples.

Original language	English
Pages (from-to)	158-163
Number of pages	6
Journal	Organic Electronics
Volume	26
Early online date	24 Jul 2015
DOIs	https://doi.org/10.1016/j.orgel.2015.07.032
Publication status	Published - Nov 2015

Keywords

OLED
Temperature
Efficiency

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10.1016/j.orgel.2015.07.032

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title = "Impact of temperature on the efficiency of organic light emitting diodes",

abstract = "Organic light emitting devices (OLEDs) are known to heat up when driven at high brightness levels required for lighting and bright display applications. This so called Joule heating can in the extreme case lead to a catastrophic failure (breakdown) of the device. In this work, we compare the effect of Joule heated and externally heated OLEDs by their electrical and optical response. A reduction in resistance is observed at elevated temperatures, both, for Joule heating, and for externally heated samples driven at low current density. In both cases, we attribute the change in resistance to a higher mobility of charge carriers at the elevated temperatures. Additionally, we observe a quenching of the emission efficiency in heated single layers as well as in OLEDs, treated with an external heat source as well as on Joule heated samples.",

keywords = "OLED, Temperature, Efficiency",

author = "{De Moraes}, I.R. and S. Scholz and M. Hermenau and M.L. Tietze and T. Schwab and S. Hofmann and M.C. Gather and K. Leo",

note = "This work has been funded by the BMBF under contract No. 13N 9872, project acronym {\textquoteleft}{\textquoteleft}OPA{\textquoteright}{\textquoteright} ",

year = "2015",

month = nov,

doi = "10.1016/j.orgel.2015.07.032",

language = "English",

volume = "26",

pages = "158--163",

journal = "Organic Electronics",

issn = "1566-1199",

publisher = "Elsevier",

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TY - JOUR

T1 - Impact of temperature on the efficiency of organic light emitting diodes

AU - De Moraes, I.R.

AU - Scholz, S.

AU - Hermenau, M.

AU - Tietze, M.L.

AU - Schwab, T.

AU - Hofmann, S.

AU - Gather, M.C.

AU - Leo, K.

N1 - This work has been funded by the BMBF under contract No. 13N 9872, project acronym ‘‘OPA’’

PY - 2015/11

Y1 - 2015/11

N2 - Organic light emitting devices (OLEDs) are known to heat up when driven at high brightness levels required for lighting and bright display applications. This so called Joule heating can in the extreme case lead to a catastrophic failure (breakdown) of the device. In this work, we compare the effect of Joule heated and externally heated OLEDs by their electrical and optical response. A reduction in resistance is observed at elevated temperatures, both, for Joule heating, and for externally heated samples driven at low current density. In both cases, we attribute the change in resistance to a higher mobility of charge carriers at the elevated temperatures. Additionally, we observe a quenching of the emission efficiency in heated single layers as well as in OLEDs, treated with an external heat source as well as on Joule heated samples.

AB - Organic light emitting devices (OLEDs) are known to heat up when driven at high brightness levels required for lighting and bright display applications. This so called Joule heating can in the extreme case lead to a catastrophic failure (breakdown) of the device. In this work, we compare the effect of Joule heated and externally heated OLEDs by their electrical and optical response. A reduction in resistance is observed at elevated temperatures, both, for Joule heating, and for externally heated samples driven at low current density. In both cases, we attribute the change in resistance to a higher mobility of charge carriers at the elevated temperatures. Additionally, we observe a quenching of the emission efficiency in heated single layers as well as in OLEDs, treated with an external heat source as well as on Joule heated samples.

KW - OLED

KW - Temperature

KW - Efficiency

UR - http://www.sciencedirect.com/science/article/pii/S1566119915300549#appd002

U2 - 10.1016/j.orgel.2015.07.032

DO - 10.1016/j.orgel.2015.07.032

M3 - Article

AN - SCOPUS:84937398548

SN - 1566-1199

VL - 26

SP - 158

EP - 163

JO - Organic Electronics

JF - Organic Electronics

ER -

Impact of temperature on the efficiency of organic light emitting diodes

Abstract

Keywords

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