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Drift‐Diffusion Study of the IQE Roll‐Off in Blue Thermally Activated Delayed Fluorescence OLEDs
Author(s) -
Rossi Daniele,
Palazzo Daniele,
Di Carlo Aldo,
Auf der Maur Matthias
Publication year - 2020
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.202000245
Subject(s) - oled , intersystem crossing , materials science , common emitter , optoelectronics , exciton , quantum efficiency , quenching (fluorescence) , fluorescence , singlet state , polaron , diode , diffusion , photochemistry , molecular physics , electron , atomic physics , excited state , chemistry , optics , physics , nanotechnology , condensed matter physics , layer (electronics) , thermodynamics , quantum mechanics
A detailed optical and electrical investigation of a blue thermally activated delayed fluorescence (TADF)‐based organic light emitting diode (OLED) is performed by drift‐diffusion simulations. Calculation of the charge transport of the different carrier populations in the device is used to predict and investigate the current–voltage characteristics and the resulting internal radiative emission profile. The explicit modeling of both singlet and exciton states of the TADF emitter combined with the inclusion of proper models for band‐to‐band transitions, bimolecular recombination mechanisms, and intersystem crossing allows to investigate the kinetics of fluorescence by thermal activation. The investigation provides insights into the role of triplet–triplet annihilation and triplet–polaron quenching for the roll‐off in internal quantum efficiency.