Dresden 2020 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 76: Poster IIIC
HL 76.26: Poster
Donnerstag, 19. März 2020, 15:00–17:30, P2/4OG
Universal Pure Aromatic Hydrocarbon Hosts for High-Efficiency Phosphorescent Organic Light-Emitting Diodes — •Qiang Wang2,3, Fabien Lucas1, Cassandre Quinton1, Liang-Sheng Liao2, Zuo-Quan Jiang2, and Cyril Poriel1 — 1Univ Rennes, CNRS, ISCR- UMR 6226 35000 Rennes, France — 2Institute of Functional Nano & Soft Materials, Soochow University Suzhou 215123, P. R. China — 3Institut für Physik & IRIS Adlershof Humboldt-Universität zu Berlin 12489 Berlin, Germany
In the field of phosphorescent organic light-emitting diodes (PhOLEDs), heteroatoms are prescriptively used to design host materials with controlled optoelectronic properties. To date, all the very high-efficiency universal hosts reported incorporate heteroatoms. However, one of the inherent issues of heteroatom-based hosts is the fragile heteroatom bonds, which causes instability in device performance. Here, we show that pure aromatic hydrocarbons hosts designed with the spirobifluorene scaffold are highly efficient and versatile hosts for PhOLEDs. With external quantum efficiencies of 27.1%, 26.0% and 27.3% for red, green and blue PhOLEDs respectively, this work not only reports the first example of high-efficiency pure hydrocarbon host in RGB PhOLEDs but also among the highest performance reported universal host. The overall performance demonstrates that pure aromatic hydrocarbons can provide new perspectives in the design of functional materials for PhOLEDs.