Non-Doped Blue AIEgen-Based OLED with EQE Approaching 10.3

Pengbo Han; Chengwei Lin; Erhan Xia; Jiawei Cheng; Qing Xia; Dezhi Yang; Anjun Qin; Dongge Ma; Ben Zhong Tang

doi:10.1002/anie.202310388

Non-Doped Blue AIEgen-Based OLED with EQE Approaching 10.3

Angew Chem Int Ed Engl. 2023 Oct 23;62(43):e202310388. doi: 10.1002/anie.202310388. Epub 2023 Sep 14.

Authors

Pengbo Han¹, Chengwei Lin¹, Erhan Xia¹, Jiawei Cheng¹, Qing Xia¹, Dezhi Yang¹, Anjun Qin¹, Dongge Ma¹, Ben Zhong Tang^{2

3

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Affiliations

¹ State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, Center for Aggregation-Induced Emission, South China University of Technology, Guangzhou, 510640, China.
² Center for Aggregation-Induced Emission, AIE Institute, South China University of Technology, Guangzhou, 510640, China.
³ School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong, Shenzhen (CUHK-Shenzhen), Guangdong, 518172, China.
⁴ Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and Reconstruction, The Hong Kong University of Science & Technology, Kowloon, 999077, Hong Kong, China.

PMID: 37668100
DOI: 10.1002/anie.202310388

Abstract

Aggregation-induced emission (AIE) luminogens (AIEgens) are attractive for the construction of non-doped blue organic light-emitting diodes (OLEDs) owning to their high emission efficiency in the film state. However, the large internal inversion rate (k_IC ^(Tn) ) between high-lying triplet levels (T_n ) and T_n-1 causes a huge loss of triplet excitons, resulting in dissatisfied device performance of these AIEgens-based non-doped OLEDs. Herein, we designed and synthesized a blue luminogen of DPDPB-AC by fusing an AIEgen of TPB-AC and a DMPPP, which feature hot exciton and triplet-triplet annihilation (TTA) up-conversion process, respectively. DPDPB-AC successfully inherits the AIE feature and excellent horizontal dipole orientation of TPB-AC. Furthermore, it owes smaller k_IC ^(Tn) than TPB-AC. When DPDPB-AC was applied in OLED as non-doped emitting layer, an outstanding external quantum efficiency of 10.3 % and an exceptional brightness of 69311 cd m^-2 were achieved. The transient electroluminescent measurements and steady-state dynamic analysis confirm that both TTA and hot exciton processes contribute to such excellent device performance. This work provides a new insight into the design of efficient organic fluorophores by managing high-lying triplet excitons.

Keywords: Aggregation Induced Emission; Blue Emission; Hot Excitons; Non-Doped Device; Organic Light Emitting Diode.

Abstract

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