CONFERENCE PROCEEDINGS
Advanced Search >
Home > Proceedings > Volume 5214 > Article
Translator Disclaimer
16 February 2004 Organometallic triplet emitters for OLED applications: controlling emission properties by chemical variation
Hartmut Yersin
Author Affiliations +
Proceedings Volume 5214, Organic Light-Emitting Materials and Devices VII; (2004) https://doi.org/10.1117/12.510009
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States
Abstract
This contribution focuses on triplet emitters. They represent attractive OLED materials, since their efficiencies can in principle be by a factor of four higher than of (small) singlet emitter molecules. On the basis of introductory models, it is discussed how the exciton formation process can be visualized, how the emitter states are populated, and why the excitation energy is finally harvested in the lowest triplet state. Further, it is shown that essential photophysical properties of organometallic emitters depend systematically on the metal participation in the triplet states and on the effective spin-orbit coupling that control the amount of zero-field splitting (ZFS) of the triplet state into substates. Increase of ZFS corresponds to more metal character in the triplet state. High metal character reduces the energy difference between excited singlet and triplet states, enhances the singlet-triplet inter-system crossing rate, lowers the emission decay time, changes the vibrational satellite structure, decreases the excited state reorganization energy, etc. These effects will be discussed by referring to well characterized compounds. Based on a new ordering scheme presented for triplet emitter materials a controlled development of compounds with pre-defined photophysical properties becomes possible.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation Download Citation
Hartmut Yersin "Organometallic triplet emitters for OLED applications: controlling emission properties by chemical variation", Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004); https://doi.org/10.1117/12.510009
PROCEEDINGS
 9 PAGES
DOWNLOAD PDF SAVE TO MY LIBRARY
SHARE
GET CITATION
< Previous Article
|
Next Article >
Advertisement
Advertisement
KEYWORDS
RELATED CONTENT
Subscribe to Digital Library
Receive Erratum Email Alert
Back to Top