Determination of the Kinetic Rates and Intrinsic Nonradiative Losses in Organic Thermally Activated Delayed Fluorescence Emitters.

ABSTRACT: Knowledge of kinetic rates of intersystem crossing (ISC) k_ISC, reverse ISC k_rISC, singlet k_S, and triplet k_T relaxation processes, respectively, is indispensable for material design as well as understanding of the operation of organic light-emitting diodes (OLEDs) based on organic emitters with thermally activated delayed fluorescence (TADF). Typically, the various rate constants are obtained by numerically fitting of the photoluminescence (PL) decay, but it is overlooked whether or not the solution of such a fit is unique. Using an analytical model, it is demonstrated that for typical TADF emitters only the sum of k_S and k_ISC, and the sum of k_T and k_rISC can be uniquely obtained from the transient PL d

SUBMITTER: Zhou X 

PROVIDER: S-EPMC12463001 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature