Related Experiment Video
Updated: Feb 19, 2026
Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
Published on: November 16, 2018
Increased Electromer Formation and Charge Trapping in Solution-Processed versus Vacuum-Deposited Small Molecule Host
Yong Joo Cho1, Scott Taylor1, Hany Aziz1
1Department of Electrical & Computer Engineering and Waterloo Institute for Nanotechnology (WIN) and †Department of Chemistry, University of Waterloo , 200 University Avenue West, Waterloo, Ontario N2G 3G1, Canada.
Abstract:
We investigate and compare between organic light-emitting devices (OLEDs) fabricated by solution-coating versus vacuum-deposition. Electroluminescence, photoluminescence, and chromatographic measurements on typical OLED host materials reveal significant electromer formation in layers fabricated by solution-processing, pointing to stronger intermolecular interactions in these systems. Delayed electroluminescence measurements reveal that solution-processed layers also have increased charge traps. The findings provide insights on the morphological differences between solution-processed and vacuum-deposited materials and shed light on the root causes behind the lower electroluminescence stability of solution-processed OLEDs.
