Pinpointing the origin of the increased driving voltage during prolonged operation in a phosphorescent OLED based on an exciplex host

Regnat, Markus; Moon, Chang-Ki; Jenatsch, Sandra; Ruhstaller, Beat; Pernstich, Kurt P.

doi:10.1016/j.orgel.2022.106570

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-25133

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Pinpointing the origin of the increased driving voltage during prolonged operation in a phosphorescent OLED based on an exciplex host
Authors:	Regnat, Markus Moon, Chang-Ki Jenatsch, Sandra Ruhstaller, Beat Pernstich, Kurt P.
et. al:	No
DOI:	10.1016/j.orgel.2022.106570 10.21256/zhaw-25133
Published in:	Organic Electronics
Volume(Issue):	108
Issue:	106570
Issue Date:	2022
Publisher / Ed. Institution:	Elsevier
ISSN:	1566-1199
Language:	English
Subjects:	OLED degradation; OLED modeling; OLED characterization; OLED driving voltage
Subject (DDC):	621.3: Electrical, communications, control engineering
Abstract:	We report on the origin of the reduced power efficiency in a red phosphorescent OLED with an exciplex host after prolonged operation. The power efficiency is reduced solely by an increased driving voltage while the radiant flux remains constant. An electrical model describing the driving voltage increase is, thus, sufficient to explain the reduced power efficiency. The electrical model of the fresh OLED and at different stages of degradation was devised from four different measurement methods. Using multiple measurement methods to determine the model parameters results in a rather unique set of model parameters, despite the large number of model parameters (38) as revealed by a correlation analysis. The increase in driving voltage could be reproduced by modifying only 7 out of the 38 model parameters. A sensitivity analysis identified the parameters with the largest effect (66%) on the driving voltage increase to be the trap density and the mobility of the employed hole transporting layer. This work highlights the benefit of using multiple measurement methods to derive reliable model parameters and the use of a sensitivity analysis to pinpoint the origin of the investigated property.
URI:	https://digitalcollection.zhaw.ch/handle/11475/25133
Fulltext version:	Published version
License (according to publishing contract):	CC BY-NC-ND 4.0: Attribution - Non commercial - No derivatives 4.0 International
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Regnat, M., Moon, C.-K., Jenatsch, S., Ruhstaller, B., & Pernstich, K. P. (2022). Pinpointing the origin of the increased driving voltage during prolonged operation in a phosphorescent OLED based on an exciplex host. Organic Electronics, 108(106570). https://doi.org/10.1016/j.orgel.2022.106570

Regnat, M. et al. (2022) ‘Pinpointing the origin of the increased driving voltage during prolonged operation in a phosphorescent OLED based on an exciplex host’, Organic Electronics, 108(106570). Available at: https://doi.org/10.1016/j.orgel.2022.106570.

M. Regnat, C.-K. Moon, S. Jenatsch, B. Ruhstaller, and K. P. Pernstich, “Pinpointing the origin of the increased driving voltage during prolonged operation in a phosphorescent OLED based on an exciplex host,” Organic Electronics, vol. 108, no. 106570, 2022, doi: 10.1016/j.orgel.2022.106570.

REGNAT, Markus, Chang-Ki MOON, Sandra JENATSCH, Beat RUHSTALLER und Kurt P. PERNSTICH, 2022. Pinpointing the origin of the increased driving voltage during prolonged operation in a phosphorescent OLED based on an exciplex host. Organic Electronics. 2022. Bd. 108, Nr. 106570. DOI 10.1016/j.orgel.2022.106570

Regnat, Markus, Chang-Ki Moon, Sandra Jenatsch, Beat Ruhstaller, and Kurt P. Pernstich. 2022. “Pinpointing the Origin of the Increased Driving Voltage during Prolonged Operation in a Phosphorescent OLED Based on an Exciplex Host.” Organic Electronics 108 (106570). https://doi.org/10.1016/j.orgel.2022.106570.

Regnat, Markus, et al. “Pinpointing the Origin of the Increased Driving Voltage during Prolonged Operation in a Phosphorescent OLED Based on an Exciplex Host.” Organic Electronics, vol. 108, no. 106570, 2022, https://doi.org/10.1016/j.orgel.2022.106570.