title: Copper(I) Complexes for Thermally Activated Delayed Fluorescence: From Photophysical to Device Properties.
abstract: Molecules that exhibit thermally activated delayed fluorescence (TADF) represent a very promising emitter class for application in electroluminescent devices since all electrically generated excitons can be transferred into light according to the singlet harvesting mechanism. Cu(I) compounds are an important class of TADF emitters. In this contribution, we want to give a deeper insight into the photophysical properties of this material class and demonstrate how the emission properties depend on molecular and host rigidity. Moreover, we show that with molecular optimization a significant improvement of selected emission properties can be achieved. From the discussed materials, we select one specific dinuclear complex, for which the two Cu(I) centers are four-fold bridged to fabricate an organic light emitting diode (OLED). This device shows the highest efficiency (of 23 % external quantum efficiency) reported so far for OLEDs based on Cu(I) emitters.
authors: Institut für Physikalische Chemie, Universität Regensburg, Universitätsstr. 31, 93053, Regensburg, Germany.
authors: Markus J
authors: MJ
authors: Leitl
authors: Cynora GmbH, Werner-von-Siemensstraße 2-6, Building 5110, 76646, Bruchsal, Germany.
authors: Daniel M
authors: DM
authors: Zink
authors: Institut für Physikalische Chemie, Universität Regensburg, Universitätsstr. 31, 93053, Regensburg, Germany.
authors: Alexander
authors: A
authors: Schinabeck
authors: Cynora GmbH, Werner-von-Siemensstraße 2-6, Building 5110, 76646, Bruchsal, Germany.
authors: Thomas
authors: T
authors: Baumann
authors: Cynora GmbH, Werner-von-Siemensstraße 2-6, Building 5110, 76646, Bruchsal, Germany. volz@cynora.com.
authors: Daniel
authors: D
authors: Volz
authors: Institut für Physikalische Chemie, Universität Regensburg, Universitätsstr. 31, 93053, Regensburg, Germany. hartmut.yersin@ur.de.
authors: Hartmut
authors: H
authors: Yersin
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D049449:Luminescence; D011789:Quantum Theory; D013696:Temperature
chemical_list: D056831:Coordination Complexes; D003300:Copper
keywords: Copper; Cu(I); Electroluminescence; Emission properties; Emitter; Fluorescence; OLED; Phosphorescence; Singlet harvesting; TADF; Thermally activated delayed fluorescence; Triplet harvesting