High-performance organic light-emitting diodes comprising ultrastable glass layers

Joan Ràfols-Ribé, Paul Anton Will, Christian Hänisch, Marta Gonzalez-Silveira, Simone Lenk, Javier Rodríguez-Viejo, Sebastian Reineke

Research output: Contribution to journalArticleResearchpeer-review

47 Citations (Scopus)

Abstract

© 2018 The Authors. 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 LT70 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.
Original languageEnglish
Article numberY
JournalScience advances
Volume4
Issue number5
DOIs
Publication statusPublished - 25 May 2018

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