Long-range resonantly enhanced triplet formation in luminescent polymers doped with iridium complexes

Nature Materials
Carsten RotheAndrew P Monkman

Abstract

The current drive to produce cheap, flexible plastic displays has led to rapid improvements in device efficiency. Inclusion of highly phosphorescent heavy-metal organic complexes as dopants ensures that both singlet and triplet excitations formed on charge recombination can be used efficiently to emit light. However, the inclusion of these dopants affects the photophysics of the host in a surprising way, generating a ten- to twenty- fold instantaneous increase in the number of host triplet states, independent of host triplet energy, quenching up to 95% of all singlet states. Once created however, these triplets are only weakly quenched by the same mechanism. We ascribe this to a resonant, remote intermolecular heavy-atom effect that greatly increases the inter-system crossing rate of the host polymer arising through the strong overlap of the delocalized pi orbitals of the host and ligands. This mechanism competes effectively with Förster energy transfer, and operates over large distances.

References

Jul 18, 2001·Journal of the American Chemical Society·Z S RomanovaP Piotrowiak
Nov 20, 2004·The Journal of Chemical Physics·Simon KingAndy Monkman

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Citations

Feb 2, 2010·The Journal of Chemical Physics·S MukhopadhyayS Guha
Jul 16, 2014·Chemical Communications : Chem Comm·Marcus T M RoodFijs W B van Leeuwen
Mar 11, 2010·Advanced Materials·Kiran T KamtekarMartin R Bryce
Jun 8, 2017·Scientific Reports·Tzu-Hao Jen, Show-An Chen
Apr 18, 2009·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Sarah ScholsUllrich Scherf
Oct 10, 2006·Physical Review Letters·C RotheA P Monkman
Jan 28, 2009·The Journal of Physical Chemistry. a·Angelo MonguzziFrancesco Meinardi
Oct 7, 2008·The Journal of Physical Chemistry. a·Paul B Merkel, Joseph P Dinnocenzo
Mar 7, 2019·The Journal of Physical Chemistry Letters·Ran LiuGuozhen Zhang
May 9, 2014·The Journal of Physical Chemistry. a·A Batagin-NetoC F O Graeff

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