Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Organic Electronics and Photovoltaics I: Light-Emitting Devices
HL 13.4: Talk
Monday, March 20, 2017, 11:45–12:00, ZEU 260
Orientation of Phosphorescent Dopants in Organic Vapor Phase Deposited Films — •Thomas Lampe1, Matthew J. Jurow3, Francisco F. Navarro2, John Facendola2, Tobias D. Schmidt1, Peter I. Djurovich2, Mark E. Thompson Thompson2, and Wolfgang Brütting1 — 1Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 2Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States — 3The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
Organic vapor phase deposition (OVPD) is an efficient film deposition technique for the preparation of organic thin films. However, the atmospheric conditions during deposition differ from the common thermal evaporation in high vacuum. To investigate the effects of these differences on heteroleptic phosphor orientation in organic guest-host systems we deposited films via OVPD while controlling the substrate temperature during deposition. The measurement of the alignment of the emissive transition dipole moments in samples deposited at room temperature leads to results comparable to preparation via thermal evaporation. Deposition of the film on a cooled substrate reveals a thermally activated behaviour of the molecular alignment process at low temperatures. The confirm an earlier model for the molecular alignment of heteroleptic phosphopors and give further insight into the physical properties of this phenomenon.
[1] M. Jurow, et. al.: Nature Mat. 15 (2015), 85-91