Defect-Mediated Efficient and Tunable Emission in van der Waals Integrated Light Sources at Room Temperature

Fu, Qiang1,2; Wang, Shixuan1,2; Zhou, Bojian3,4; Xia, Weiqiao1,2; Liu, Xiaoya1,2; Han, Xu5; Duan, Zhexing1,2; Liu, Tianqi1,2; Sun, Xudong1,2; Yuan, Xueyong1,2; Huang, Yuan5; Lin, Junhao3,4,6; Zhang, Qi1,2; Hu, Zhenliang1,2; Lu, Junpeng1,2,7; Ni, Zhenhua1,2,7,8

2024-10-01

10.1002/adfm.202414062

ADVANCED FUNCTIONAL MATERIALS   影响因子和分区

1616-301X

1616-3028

["Despite defect-mediated states in monolayer semiconductors have been considered as efficient emitters in cryogenic conditions, they are severely quenched at room temperature (RT) because of multiple thermal-induced non-radiative channels, hindering their practical use. Here, robust and tunable defect-mediated emissions at RT, designated as D1 (1.82 eV) and D2 (1.62 eV), are discovered in monolayer WS2 through argon plasma treatment, which, via multiple corroborative experiments, are attributed to distinct physical processes: bound excitons associated with sulfur vacancies (Vs) and the band-to-acceptor recombination, respectively. Remarkably, the defective sample exhibits over ten-fold increase in both photoluminescence quantum yield and full-width at half-maximum (FWHM) compared to its intrinsic counterpart. Leveraging these pronounced edges, light-emitting diodes (LEDs) functioning at RT achieve broadband (FWHM: 490 meV) and continuously tunable emission from 1.6 to 2.0 eV, as well as the highest electroluminescence (EL) external quantum efficiency (EQE) of approximate to 1.39% among transient LEDs based on monolayer semiconductors to date, thereby unveiling a new strategy for emission tailoring at the atomic-scale limit.","The authors demonstrate two newly discovered defect-mediated emissions from plasma irradiated monolayer WS2, which are even more efficient than the free exciton emissions at room temperature. By constructing integrated light sources driven by alternating currents, the defective sample shows an external quantum efficiency approximate to 1.39%, which is currently the highest among transient van der Waals LEDs at room temperature. image"]

2D materials bound excitons defects light-emitting diodes photoluminescence quantum yield

SCI

英语

通讯

Presidential Fund and Development and Reform Commission of Shenzhen Municipality["2023YFB3611400","2022YFF0609801","2021YFA1200700","2019YFA0308000"] ; National Key R&D Program of China["62225404","62174026","61927808","12304441","T2321002","12304465","62320106004"] ; National Natural Science Foundation of China[BK20230831] ; Natural Science Foundation of Jiangsu Province["BK20222007","BK20232044"] ; Major Project[2242023K30027] ; Fundamental Research Funds for the Central Universities[2019ZT08C044] ; Guangdong Innovative and Entrepreneurial Research Team Program[20200925161102001] ; Shenzhen Science and Technology Program[ZDSYS20190902092905285]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001327150800001

WILEY-V C H VERLAG GMBH

Web of Science

1.Southeast Univ, Sch Phys, Nanjing 211189, Peoples R China
2.Southeast Univ, Key Lab Quantum Mat & Devices, Minist Educ, Nanjing 211189, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, Shenzhen Key Lab Adv Quantum Funct Mat & Devices, Shenzhen 518055, Peoples R China
5.Beijing Inst Technol, Adv Res Inst Multidisciplinary Sci, Beijing 100081, Peoples R China
6.Quantum Sci Ctr Guangdong Hong Kong Macao Greater, Shenzhen 518045, Peoples R China
7.Southeast Univ, Sch Elect Sci & Engn, Nanjing 210096, Peoples R China
8.Purple Mt Labs, Nanjing 211111, Peoples R China

Fu, Qiang,Wang, Shixuan,Zhou, Bojian,et al. Defect-Mediated Efficient and Tunable Emission in van der Waals Integrated Light Sources at Room Temperature[J]. ADVANCED FUNCTIONAL MATERIALS,2024.

Fu, Qiang.,Wang, Shixuan.,Zhou, Bojian.,Xia, Weiqiao.,Liu, Xiaoya.,...&Ni, Zhenhua.(2024).Defect-Mediated Efficient and Tunable Emission in van der Waals Integrated Light Sources at Room Temperature.ADVANCED FUNCTIONAL MATERIALS.

Fu, Qiang,et al."Defect-Mediated Efficient and Tunable Emission in van der Waals Integrated Light Sources at Room Temperature".ADVANCED FUNCTIONAL MATERIALS (2024).