Efficient Green Spin Light-Emitting Diodes Enabled by Ultrafast Energy- and Spin-Funneling in Chiral Perovskites

Yao, Jingwen1,2,3; Wang, Zhiyu1; Huang, Yuling4; Xue, Jie1; Zhang, Dengliang5; Chen, Jiangshan5; Chen, Xihan4; Dong, Shou-Cheng2,3; Lu, Haipeng1,6

2024-05-10

10.1021/jacs.4c02821

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   影响因子和分区

0002-7863

1520-5126

Introducing molecular chirality into perovskite crystal structures has enabled the control of carrier spin states, giving rise to circularly polarized luminescence (CPL) in thin films and circularly polarized electroluminescence (CPEL) in LEDs. Spin-LEDs can be fabricated either through a spin-filtering layer enabled by chiral-induced spin selectivity or a chiral emissive layer. The former requires a high degree of spin polarization and a compatible spinterface for efficient spin injection, which might not be easily integrated into LEDs. Alternatively, a chiral emissive layer can also generate circularly polarized electroluminescence, but the efficiency remains low and the fundamental mechanism is elusive. In this work, we report an efficient green LED based on quasi-two-dimensional (quasi-2D) chiral perovskites as the emitting layer (EML), where CPEL is directly produced without separate carrier spin injection. The optimized chiral perovskite thin films exhibited strong CPL at 535 nm with a photoluminescence quantum yield (PLQY) of 91% and a photoluminescence dissymmetry factor (g(lum)) of 8.6 x 10(-2). Efficient green spin-LEDs were successfully demonstrated, with a large EL dissymmetry factor (g(EL)) of 7.8 x 10(-2) and a maximum external quantum efficiency (EQE) of 13.5% at room temperature. Ultrafast transient absorption (TA) spectroscopic study shows that the CPEL is generated from a rapid energy transfer accompanied by spin transfer from 2D to 3D perovskites. Our study not only demonstrates a reliable approach to achieve high performance spin-LEDs but also reveals the fundamental mechanism of CPEL with an emissive layer of chiral perovskites.

SCI ; EI

英语

其他

National Natural Science Foundation of China["ITS/046/22","GHP/004/20SZ"] ; Hong Kong Innovation and Technology Commission[26300721] ; Research Grants Council of Hong Kong via the Early Career Scheme["16302120","16306720"] ; General Research Fund["22205186","22103034"] ; Hong Kong University of Science and Technology (HKUST) School of Science (SSCI)[R9270]

Chemistry

Chemistry, Multidisciplinary

WOS:001226127500001

AMER CHEMICAL SOC

Web of Science

1.Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Hong Kong 999077, Peoples R China
2.Hong Kong Univ Sci & Technol, Inst Adv Study, Kowloon, Hong Kong 999077, Peoples R China
3.Hong Kong Univ Sci & Technol, State Key Lab Adv Displays & Optoelect Technol, Dept Elect & Comp Engn, Kowloon, Hong Kong 999077, Peoples R China
4.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Guangdong, Peoples R China
5.South China Univ Technol, Inst Polymer Optoelect Mat & Devices, Guangdong Prov Key Lab Luminescence Mol Aggregates, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China
6.Hong Kong Univ Sci & Technol, Energy Inst, Kowloon, Hong Kong 999077, Peoples R China

Yao, Jingwen,Wang, Zhiyu,Huang, Yuling,et al. Efficient Green Spin Light-Emitting Diodes Enabled by Ultrafast Energy- and Spin-Funneling in Chiral Perovskites[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2024,146(20).

Yao, Jingwen.,Wang, Zhiyu.,Huang, Yuling.,Xue, Jie.,Zhang, Dengliang.,...&Lu, Haipeng.(2024).Efficient Green Spin Light-Emitting Diodes Enabled by Ultrafast Energy- and Spin-Funneling in Chiral Perovskites.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,146(20).

Yao, Jingwen,et al."Efficient Green Spin Light-Emitting Diodes Enabled by Ultrafast Energy- and Spin-Funneling in Chiral Perovskites".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 146.20(2024).