TY - JOUR
T1 - Clarifying the mechanism of triplet–triplet annihilation in phosphorescent organic host–guest systems
T2 - A combined experimental and simulation study
AU - Zhang, L.
AU - van Eersel, H.
AU - Bobbert, P.A.
AU - Coehoorn, R.
PY - 2016/5/16
Y1 - 2016/5/16
N2 - At high brightness, triplet–triplet annihilation (TTA) reduces the efficiency of organic light-emitting diodes. Triplet diffusion may considerably enhance this effect, which is otherwise limited by the rate of long-range interactions. Although its role can be clarified by studying the emissive dye concentration dependence of the TTA loss, we demonstrate here the practical applicability of a more direct method, requiring a study for only a single dye concentration. The method uses transient photoluminescence yield measurements, for a wide initial excitation density range. The analysis is applied to an iridium complex and is supported by the results of kinetic Monte Carlo simulations.
AB - At high brightness, triplet–triplet annihilation (TTA) reduces the efficiency of organic light-emitting diodes. Triplet diffusion may considerably enhance this effect, which is otherwise limited by the rate of long-range interactions. Although its role can be clarified by studying the emissive dye concentration dependence of the TTA loss, we demonstrate here the practical applicability of a more direct method, requiring a study for only a single dye concentration. The method uses transient photoluminescence yield measurements, for a wide initial excitation density range. The analysis is applied to an iridium complex and is supported by the results of kinetic Monte Carlo simulations.
U2 - 10.1016/j.cplett.2016.04.043
DO - 10.1016/j.cplett.2016.04.043
M3 - Article
SN - 0009-2614
VL - 652
SP - 142
EP - 147
JO - Chemical Physics Letters
JF - Chemical Physics Letters
ER -