Reducing the efficiency roll-off in organic light-emitting diodes at high currents under external magnetic fields
نویسندگان
چکیده
Singlet-polaron and triplet-polaron annihilation mechanisms are the most detrimental exciton quenching processes that lower efficiency of organic light-emitting diodes (OLEDs) at high current densities, causing so-called roll-off in these devices. These loss also critical obstacles towards realization electrically pumped semiconductor lasers, which require very densities to reach threshold. Herein, under a relatively large external magnetic field, we demonstrate europium (Eu 3 + )-based solution-processed OLEDs can be suppressed some extent while luminance is enhanced. We achieve this by reducing Förster-type exciton–polaron processes. Under applied show manipulation polaron-spin dynamics lead quantitative suppression. • Modified an field lanthanide-based OLEDs. Efficiency suppression due reduced quenching. Brightness enhancement field.
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ژورنال
عنوان ژورنال: Organic Electronics
سال: 2021
ISSN: ['1878-5530', '1566-1199']
DOI: https://doi.org/10.1016/j.orgel.2021.106231