Details

Autor(en) / Beteiligte

• Liang, Xiao
• Yan, Zhi‐Ping
• Han, Hua‐Bo
• Wu, Zheng‐Guang
• Zheng, You‐Xuan
• Meng, Hong
• Zuo, Jing‐Lin
• Huang, Wei

Titel

Peripheral Amplification of Multi‐Resonance Induced Thermally Activated Delayed Fluorescence for Highly Efficient OLEDs

Ist Teil von

• Angewandte Chemie (International ed.), 2018-08, Vol.57 (35), p.11316-11320

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Multi‐resonance induced by boron and nitrogen atoms in opposite resonance positions endows a thermally activated delayed fluorescence (MR‐TADF) emitter with a strikingly small full width at half maximum of only 26 nm and excellent photoluminescence quantum yield of up to 97.48 %. The introduction of a carbazole unit in the para position of the B‐substituted phenyl‐ring can significantly boost up the resonance effect without compromising the color fidelity, subsequently enhancing the performances of the corresponding pure blue TADF‐OLED, with an outstanding external quantum efficiency (EQE) up to 32.1 % and low efficiency roll‐off, making it one of the best TADF‐OLEDs in the blue region to date. Furthermore, utilizing this material as host for a yellow phosphorescent emitter, the device also shows a significantly reduced turn‐on voltage of 3.2 V and an EQEmax of 22.2 %. Strong enhancement of the multi‐resonance effect in thermally activated delayed fluorescence species by a peripheral carbazole unit substitution was applied for a material with a photoluminescent quantum yield of up to 97.48 %. The maximum luminance exceeded 16 000 cd m−2 and the highest external quantum efficiency was up to 32.1 %.