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Influence of the Dielectric Constant around an Emitter on Its Delayed Fluorescence

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Despite the commercial success of organic emitters based on thermally activated delayed fluorescence (TADF), a general understanding of emitter-matrix interactions is still lacking. How does the dielectric constant around an… Click to show full abstract

Despite the commercial success of organic emitters based on thermally activated delayed fluorescence (TADF), a general understanding of emitter-matrix interactions is still lacking. How does the dielectric constant around an emitter impact its delayed fluorescence? The authors study the photophysical properties of three emitters in solution, showing that a higher excited triplet state at low dielectric constants can boost the efficiency of blue TADF emitters. Experiments are supported by state-of-the-art quantum simulations. The findings may be generalized to solid-state systems, pointing to tuning of host-guest architectures to improve the efficiency of TADF-based blue OLEDs.

Keywords: fluorescence; dielectric constant; delayed fluorescence; around emitter; influence dielectric; constant around

Journal Title: Physical Review Applied
Year Published: 2019

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