Publication Overview and Download | |
|
| |
|
W. Staroske, M. Pfeiffer, K. Leo, M. Hoffmann, Single-step triplet-triplet annihilation: An intrinsic limit for the high brightness efficiency of phosphorescent organic light emitting diodes Phys. Rev. Lett. 98 (2007), 197402. | |
|
| |
| Abstract | |
|
We investigate triplet-triplet-annihilation in molecular host-guest systems where triplets are localized on spatially
separated guest molecules. Our results indicate that the dominant mechanism of annihilation is single-step long-range
(Förster-type) energy transfer between two excited guests. This mechanism leads to a fundamental limit for the
efficiency of phosphorescent organic light emitting diodes at high luminance. Our model is confirmed by
photoluminescence decay experiments on 2,3,7,8,12,13,17,18-octaethylporphine platinum as guest in a host-matrix of
4,4'-N,N'-dicarbazole-biphenyl.
| |
|
| |
| DOI:10.1103/PhysRevLett.98.197402 (direct link to publisher) | |
| pdf file of manuscript version | |
|
| |
|
homepage M. Hoffmann | |
|
| |
| last updated: M. Hoffmann, Dec 2007 |