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Updated: Jan 29, 2026

Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
Published on: November 7, 2025
Realizing high-efficiency TADF from a low-performing cyanopyridine emitter via symmetric coupling
Ashish K Mazumdar1, Bhaskar Chelleng1, Svadha Devi1
1Materials Research Centre, Indian Institute of Science, Bengaluru, Karnataka-560012, India. rajamalli@iisc.ac.in.
None:
A low-performing cyanopyridine-based emitter (tCzPyCN) is converted into a highly efficient TADF emitter using homo-coupling. A dual-core counterpart (2tCz2Py2CN) is achieved by symmetrically connecting the single-core emitter, which significantly reduces the singlet-triplet energy gap (ΔEST) from 0.21 eV to 0.08 eV. The EQEmax increases from 0.94% to 15.02% due to this near-degenerate energy landscape. The enhancement results from the suppression of competing non-radiative triplet decay pathways (kTnr = 0.11 × 105 s-1). This effective suppression of non-radiative loss is supported by PLQY, which nearly doubles from 33.40% to 59.10%. This study demonstrates that symmetric homo-coupling is an effective method for transforming underperforming emitters into high-performing TADF systems.
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