Details

Autor(en) / Beteiligte

• Wu, Xiugang
• Su, Bo-Kang
• Chen, Deng-Gao
• Liu, Denghui
• Wu, Chi-Chi
• Huang, Zhi-Xuan
• Lin, Ta-Chun
• Wu, Cheng-Ham
• Zhu, Mengbing
• Li, Elise Y.
• Hung, Wen-Yi
• Zhu, Weiguo
• Chou, Pi-Tai

Titel

The role of host–guest interactions in organic emitters employing MR-TADF

Ist Teil von

• Nature photonics, 2021-10, Vol.15 (10), p.780-786

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2021

Quelle

Nature

Beschreibungen/Notizen

• Research into organic light emitters employing multiple resonance-induced thermally activated delayed fluorescence (MR-TADF) materials is presently attracting a great deal of attention due to the potential for efficient deep-blue emission. However, the origins and mechanisms of successful TADF are unclear, as many MR-TADF materials do not show TADF behaviour in solution, but only as particular pure solids. Here, an investigation into a well-known MR-TADF material, DABNA-1, together with other new MR materials (9 H -quinolino[3,2,1- kl ]phenothiazin-9-one (QPO) and 9 H -quinolino-[3,2,1- kl ]-phenothiazin-9-one 5,5-dioxide (QP3O)), yields new insights regarding the origin of TADF. Although a material system may support the concept of MR, inefficiency in both forward and reverse intersystem crossings forbids TADF unless a suitable host material allows an exciplex-like host–emitter interaction that boosts TADF. This boosted-TADF mechanism can be generalized to any fluorescence dye that lacks TADF in the photoluminescence measurement but has a thermally accessible S 1 –T 1 energy gap, opening the way to high-performance organic light-emitting diodes. This study reveals the importance of host–guest interactions for effective multiple-resonance thermally activated delayed fluorescence in organic light emitters.