High-performance organic light-emitting diodes comprising ultrastable glass layers
Ràfols-Ribé, Joan (Universitat Autònoma de Barcelona. Departament de Física)
Will, Paul-Anton (Technische Universität Dresden. Dresden Integrated Center for Applied Physics and Photonic Materials)
Hänisch, Christian (Technische Universität Dresden. Dresden Integrated Center for Applied Physics and Photonic Materials)
González Silveira, Marta (Universitat Autònoma de Barcelona. Departament de Física)
Lenk, Simone (Technische Universität Dresden. Dresden Integrated Center for Applied Physics and Photonic Materials)
Rodríguez-Viejo, Javier (Universitat Autònoma de Barcelona. Departament de Física)
Reineke, Sebastian (Technische Universität Dresden. Dresden Integrated Center for Applied Physics and Photonic Materials)

Date:	2018
Abstract:	Organic light-emitting diodes with ultrastable glass emission layers show increased efficiency and device stability. Organic light-emitting diodes (OLEDs) are one of the key solid-state light sources for various applications including small and large displays, automotive lighting, solid-state lighting, and signage. For any given commercial application, OLEDs need to perform at their best, which is judged by their device efficiency and operational stability. We present OLEDs that comprise functional layers fabricated as ultrastable glasses, which represent the thermodynamically most favorable and, thus, stable molecular conformation achievable nowadays in disordered solids. For both external quantum efficiencies and LT lifetimes, OLEDs with four different phosphorescent emitters show >15% enhancements over their respective reference devices. The only difference to the latter is the growth condition used for ultrastable glass layers that is optimal at about 85% of the materials' glass transition temperature. These improvements are achieved through neither material refinements nor device architecture optimization, suggesting a general applicability of this concept to maximize the OLED performance, no matter which specific materials are used.
Grants:	European Commission 679213 European Commission 646259 Ministerio de Economía y Competitividad MAT2013-40986-P Ministerio de Economía y Competitividad MAT2014-57866-REDT Ministerio de Economía y Competitividad MAT2016-79579-R
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Science advances, Vol. 4, Issue 5 (May 2018) , art. eaar833, ISSN 2375-2548

DOI: 10.1126/sciadv.aar8332
PMID: 29806029

9 p, 920.5 KB

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