Details

Autor(en) / Beteiligte

• Shi, Yi‐Zhong
• Wang, Kai
• Li, Xing
• Dai, Gao‐Le
• Liu, Wei
• Ke, Ke
• Zhang, Ming
• Tao, Si‐Lu
• Zheng, Cai‐Jun
• Ou, Xue‐Mei
• Zhang, Xiao‐Hong

Titel

Intermolecular Charge‐Transfer Transition Emitter Showing Thermally Activated Delayed Fluorescence for Efficient Non‐Doped OLEDs

Ist Teil von

• Angewandte Chemie International Edition, 2018-07, Vol.57 (30), p.9480-9484

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A novel molecular model of connecting electron‐donating (D) and electron‐withdrawing (A) moieties via a space‐enough and conjugation‐forbidden linkage (D‐Spacer‐A) is proposed to develop efficient non‐doped thermally activated delayed fluorescence (TADF) emitters. 10‐(4‐(4‐(4,6‐diphenyl‐1,3,5‐triazin‐2‐yl) phenoxy) phenyl)‐9,9‐dimethyl‐9,10‐dihydroacridine (DMAC‐o‐TRZ) was designed and synthesized accordingly. As expected, it exhibits local excited properties in single‐molecule state as D‐Spacer‐A molecular backbone strongly suppress the intramolecular charge‐transfer (CT) transition. And intermolecular CT transition acted as the vital radiation channel for neat DMAC‐o‐TRZ film. As in return, the non‐doped device exhibits a remarkable maximum external quantum efficiency (EQE) of 14.7 %. These results prove the feasibility of D‐Spacer‐A molecules to develop intermolecular CT transition TADF emitters for efficient non‐doped OLEDs. Non‐doped OLEDs: A novel molecular model of connecting electron‐donating (D) and electron‐withdrawing (A) moieties through a conjugation‐forbidden spacer is proposed to develop efficient thermally activated delayed fluorescence emitters for non‐doped organic light‐emitting diodes. The structure shows intermolecular charge‐transfer (CT) transitions as the major radiative channel and a suppressed effect of photoluminescence concentration quenching.