Universität zu Köln

Archer, Emily ORCID: 0000-0001-8513-3918, Hillebrandt, Sabina, Keum, Changmin, Murawski, Caroline ORCID: 0000-0002-3496-4110, Murawski, Jan, Tenopala-Carmona, Francisco and Gather, Malte C. ORCID: 0000-0002-4857-5562 . Accurate Efficiency Measurements of Organic Light-Emitting Diodes via Angle-Resolved Spectroscopy. Adv. Opt. Mater.. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 2195-1071

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Abstract

The accurate characterization of thin-film light emitting diodes (LEDs)-including organic light emitting diodes (OLEDs), perovskite LEDs, and quantum dot LEDs-is crucial to the understanding of the factors that influence their efficiency and thus to the fabrication of LEDs with improved performance and stability. In addition, detailed information about the angular characteristics of LED emission is useful to assess the suitability of individual architectures, e.g., for display applications. Here, the implementation of a goniometer-based measurement system and corresponding protocol are described that allow to accurately determine the current-voltage-luminance characteristics, external quantum efficiency, and luminous efficacy of OLEDs and other emerging thin-film LEDs. The system allows recording of angle-resolved electroluminescence spectra and accurate efficiency measurements for devices with both Lambertian and non-Lambertian emission characteristics. A detailed description of the setup and a protocol for assembling and aligning the required hardware are provided. Drawings of all custom parts and the open-source Python software required to perform the measurement and to analyze the data are included.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Archer, Emily UNSPECIFIED orcid.org/0000-0001-8513-3918 UNSPECIFIED Hillebrandt, Sabina UNSPECIFIED UNSPECIFIED UNSPECIFIED Keum, Changmin UNSPECIFIED UNSPECIFIED UNSPECIFIED Murawski, Caroline UNSPECIFIED orcid.org/0000-0002-3496-4110 UNSPECIFIED Murawski, Jan UNSPECIFIED UNSPECIFIED UNSPECIFIED Tenopala-Carmona, Francisco UNSPECIFIED UNSPECIFIED UNSPECIFIED Gather, Malte C. UNSPECIFIED orcid.org/0000-0002-4857-5562 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-311931
DOI:	10.1002/adom.202000838
Journal or Publication Title:	Adv. Opt. Mater.
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	2195-1071
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EXTERNAL QUANTUM EFFICIENCY; DISPLAYS; EMISSION; DEVICES Multiple languages Materials Science, Multidisciplinary; Optics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/31193