Universität zu Köln

Schmidt, Ines, Olthof, Selina ORCID: 0000-0002-8871-1549, Xu, Hui ORCID: 0000-0002-2687-5388 and Meerholz, Klaus ORCID: 0000-0001-7450-4672 (2022). Phosphine Oxide Additives for High-Brightness Inorganic Perovskite Light-Emitting Diodes. Adv. Opt. Mater., 10 (3). WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 2195-1071

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Abstract

In the search for cost-efficient, simple, and solution processable light-emitting diodes, metal halide perovskites show encouraging developments. In particular, the purely inorganic CsPbBr3 is a promising material with outstanding optoelectronic properties. However, the poor solubility of Cs-salts leads to discontinuous film formation and a high density of defect states at the crystal surface. These problems are known to be reduced by Lewis base additives. In this work, a facile fabrication method using phosphine oxide ligands such as the trioctyl and triphenyl derivatives (TOPO and TPPO, respectively) is introduced. These additives reduce surface defect states, lead to an energetic confinement of charge carriers, and improve radiative recombination in the perovskite crystals. Using X-ray diffraction, changes in crystallinity are observed, in particular the crystallinity of the 3D phase CsPbBr3 is reduced by addition of TOPO, while changes to the 0D phase (Cs4PbBr6) are much smaller. Overall, TOPO and TPPO containing films result in current efficiencies as high as 14 and 10 cd A(-1) and an outstanding brightness of more than 57 800 and 18 300 cd m(-2) in a relatively simple device stack.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schmidt, Ines UNSPECIFIED UNSPECIFIED UNSPECIFIED Olthof, Selina UNSPECIFIED orcid.org/0000-0002-8871-1549 UNSPECIFIED Xu, Hui UNSPECIFIED orcid.org/0000-0002-2687-5388 UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-571746
DOI:	10.1002/adom.202101602
Journal or Publication Title:	Adv. Opt. Mater.
Volume:	10
Number:	3
Date:	2022
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	2195-1071
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ROOM-TEMPERATURE SYNTHESIS; QUANTUM DOTS; HALIDE PEROVSKITES; PERFORMANCE; STABILITY; POLYMER; NANOCRYSTALS; CSPBX3; FILMS Multiple languages Materials Science, Multidisciplinary; Optics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57174