Multifunctional tris(triazolo)triazine-based emitter with dual-TADF, RTP, AIEE and AIDF properties

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2024-08, Vol.12 (34), p.13651-13664
• Main Authors: Ferreira, Marli, Decarli, Nícolas Oliveira, Nyga, Aleksandra, Erfurt, Karol, Lingagouder, Jaijanarthanan, de Sousa, Leonardo Evaristo, de Thieulloy, Laure, de Silva, Piotr, Data, Przemyslaw
• Format: Article
• Language: English
• Subjects: Emitters; Energy gap; Fluorescence; Organic light emitting diodes; Phosphorescence; Quantum efficiency; Room temperature
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d4tc00606b

Tremendous attention in recent years has been devoted to the design of multifunctional purely organic emitters owing to their diverse emissive mechanism and widespread applications in the luminescent field. Herein, we describe the synthesis and photophysical investigation of D 3 A-type tris(triazolo)triazine (TTT) multifunctional emitters with unprecedented dual thermally activated delayed fluorescence (TADF), room-temperature phosphorescence (RTP), aggregation-induced emission enhancement (AIEE), and aggregation-induced delayed fluorescence (AIDF). We demonstrate that the presence of methyl substituents at different positions of the emitter offers the possibility to switch between RTP and TADF processes by choosing appropriate hosts and controlling the singlet-triplet energy gap (Δ E ST ). TTT-PTZ , in particular, is a very strong TADF emitter (DF/PF ratio 9.3) in Zeonex®, even with a Δ E ST around 0.20 eV, displaying high external quantum efficiency (EQE) of up to 12.4% in solution-processed organic light-emitting diodes (OLEDs). Tremendous attention in recent years has been devoted to the design of multifunctional purely organic emitters owing to their diverse emissive mechanism and widespread applications in the luminescent field.