AUTHOR=Thomas Heidi , Haase Katherina , Achenbach Tim , Bärschneider Toni , Kirch Anton , Talnack Felix , Mannsfeld Stefan C. B. , Reineke Sebastian 

TITLE=Impact of Fabrication Processes of Small-Molecule-Doped Polymer Thin-Films on Room-Temperature Phosphorescence

JOURNAL=Frontiers in Physics

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.841413

DOI=10.3389/fphy.2022.841413

ISSN=2296-424X

ABSTRACT=The development of organic materials displaying room-temperature phosphorescence is a research field with growing interest over the last years. Here, the emitter molecule design is in the majority of research efforts in the focus of realizing an increase of phosphorescence lifetimes of host:emitter systems. Rarely, the overall thin-film system is optimized with respect to maximum triplet-state luminescence. Herein, the investigation of thin films consisting of N,N′-di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB) embedded in different polymer matrices is reported. Phosphorescence parameters such as phosphorescence lifetime, photoluminescence quantum yield and phosphorescence-to-luminescence ratio are determined and the importance of the film fabrication process is shown.