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Updated: May 12, 2025

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
Published on: October 24, 2017
Organic phosphorescence in Pt(II)-complexes linked to organic chromophores for blue-emitting organic light-emitting
Seong Woon Jeong1, Hyung Joo Lee1,2, Bum June Park3
1Department of Advanced Materials Chemistry, Korea University, Sejong, 30019, Republic of Korea.
Abstract:
Recently, organic persistent room-temperature phosphorescence (OPRTP), entailing triplet-state emission from purely organic units instead of luminescent heavy metal complexes, has emerged as a promising alternative for the development of emitting materials in organic light-emitting diodes (OLEDs). For OPRTP-based devices to achieve acceptable performances, the low emission efficiency caused by weak spin-orbit coupling and high sensitivity to external environmental factors, such as temperature, moisture, and oxygen must be overcome. Herein, four-coordinate N-heterocyclic carbene Pt(II) complexes bearing carbazole (Cz) or naphthalene (Np) groups were assembled and found to exhibit exothermic triplet-triplet energy transfer (TTET) from the high triplet metal-to-ligand charge transfer (3MLCT) state (T1 = 2.97 eV) of the Pt core to the lower triplet states (T1 = 2.58-2.87 eV) of the tethered organic Cz and Np moieties. The presented design strategy enables the persistent organic phosphorescence of organic molecules under ambient conditions and triplet electroluminescence of the organic group via TTET in OLED applications.
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