Thermally activated delayed fluorescence material with aggregation-induced emission properties for highly efficient organic light-emitting diodes

Zhao, Yaodong1; Wang, Weigao3; Gui, Chen4; Fang, Li1; Zhang, Xinlei1; Wang, Shujuan1; Chen, Shuming3; Shi, Heping1,2,4; Tang, Ben Zhong2,4

2018-03-21

10.1039/c7tc04934j

Journal of Materials Chemistry C   影响因子和分区

2050-7526

2050-7534

Luminescent materials with aggregation-induced emission (AIE) properties exhibit high solid state emission, while thermally activated delayed fluorescence (TADF) materials can fully harvest singlet and triplet excitons to achieve efficient electroluminescence (EL). Herein, the amalgamation of AIE and TADF properties, termed aggregation-induced emission and thermally activated delayed fluorescence (AIE-TADF), is a promising strategy to design novel desirable luminescent materials. In this paper, a new tailor-made material, DCPDAPM, is obtained based on carbazole as the skeleton, 9,9-dimethyl-9,10-dihydroacridine as the donor group and benzophenone as the acceptor group. Its structure is fully characterized by elemental analysis, NMR spectroscopy and mass spectrometry. Furthermore, its thermal stability, photophysical properties, and electrochemical properties are investigated systematically. The results show that this AIE-TADF compound exhibits good thermal stability, electrochemical stability and AIE and TADF properties. Ultimately, using DCPDAPM and DCPDAPM doped into CBP as light-emitting layers, a non-doped OLED (device A) and doped OLEDs (device B, device C and device D) were fabricated and studied. Device A displays green light with a turn-on voltage of 3.2 V, a maximum brightness of 123 371 cd m(-2), a maximum current efficiency of 26.88 cd A(-1), a maximum power efficiency of 15.63 lm W-1 and an external quantum efficiency of 8.15%. Among the doped OLEDs (device B, device C and device D), device D shows the best EL performance with a turn-on voltage of 3.6 V, a maximum brightness of 116100 cd m(-2), a maximum current efficiency of 61.83 cd A(-1), a maximum power efficiency of 40.45 lm W-1 and an external quantum efficiency of 19.67%. These results adequately demonstrate the practicability of combining AIE and TADF to explore new efficient emitters.

SCI ; EI

英语

通讯

Shenzhen Talent Peacock Plan[KGTD2015071710313656]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied

WOS:000428999300029

ROYAL SOC CHEMISTRY

20181204923396

Display devices ; Efficiency ; Electroluminescence ; Fluorescence ; Light ; Luminance ; Mass spectrometry ; Metals ; Nuclear magnetic resonance spectroscopy ; Organic light emitting diodes (OLED) ; Polymethyl methacrylates ; Thermodynamic stability

Thermodynamics:641.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Computer Peripheral Equipment:722.2 ; Light, Optics and Optical Devices:741 ; Light/Optics:741.1 ; Chemistry:801 ; Organic Polymers:815.1.1 ; Production Engineering:913.1 ; Quantum Theory; Quantum Mechanics:931.4

Web of Science

1.Shanxi Univ, Sch Chem & Chem Engn, Taiyuan 030006, Shanxi, Peoples R China
2.South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China
3.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Guangdong, Peoples R China
4.Hong Kong Univ Sci & Technol, State Key Lab Mol Neurosci, Inst Mol Funct Mat, Dept Chem,Inst Adv Study,Div Biomed Engn,Div Life, Kowloon, Hong Kong, Peoples R China

Zhao, Yaodong,Wang, Weigao,Gui, Chen,et al. Thermally activated delayed fluorescence material with aggregation-induced emission properties for highly efficient organic light-emitting diodes[J]. Journal of Materials Chemistry C,2018,6(11):2873-2881.

Zhao, Yaodong.,Wang, Weigao.,Gui, Chen.,Fang, Li.,Zhang, Xinlei.,...&Tang, Ben Zhong.(2018).Thermally activated delayed fluorescence material with aggregation-induced emission properties for highly efficient organic light-emitting diodes.Journal of Materials Chemistry C,6(11),2873-2881.

Zhao, Yaodong,et al."Thermally activated delayed fluorescence material with aggregation-induced emission properties for highly efficient organic light-emitting diodes".Journal of Materials Chemistry C 6.11(2018):2873-2881.