Carbon Nitride with Rationally Designed π-Conjugated Structure for Bright Blue-Violet Light-Emitting Diodes

He，Xingchen1; Meng，Lingqiang1; Liu，Yanliang2; Zhang，Xue1; Cheng，Ziqiang1; Huang，Hao1; He，Rui1; Pan，Hao1; Kang，Yihong1,3; Li，Jia1; Wang，Yiqing4; Chu，Paul K.5; Xu，Baomin2; Wang，Jiahong1; Yu，Xue Feng1

2022

10.1002/smll.202202969

Small   影响因子和分区

1613-6810

1613-6829

Carbon nitride consisting of the broken π-conjugated structure (bc-CN) is designed as the emitting layer in a blue-violet light emitting diode (LED). The bc-CN is prepared by a metal-oxide (MgO) template-assisted method, in which the low reaction temperature and nano MgO jointly control the degree of polymerization to form cyano groups and broken π-conjugation in the bc-CN nanosheets (bc-CN NS) which emit intense blue-violet photoluminescence at 412 nm. The broken π-conjugated heptazine-ring structure in the bc-CN NS mitigates non-radiation energy loss and promotes the d*–LP transition. As a result, a high quantum efficiency of 73.1% is achieved. The excellent dispersing ability of the bc-CN NS enables solution-based fabrication of the light emitting diode (LED). The LED exhibits intense electroluminescence of 236 cd m at 412 nm with an external quantum efficiency of 0.46%. The broken π-conjugation modulates the optical properties of the polymerized carbon nitride semiconductor giving rise to intense blue-violet electroluminescence, which is very desirable for printable and wide-color-gamut display devices.

2D materials blue-violet light emission carbon nitride light emitting diodes π-conjugated structure

SCI ; EI

英语

通讯

National Natural Science Foundation of China[21975280,12004108,62004091] ; Chinese Academy of Sciences Special Research Assistant Project["E15907","Y95909"] ; Youth Innovation Promotion Association Chinese Academy of Sciences[2020354] ; China Postdoctoral Science Foundation["2021T140692","2020M672872"] ; Guangdong Basic and Applied Basic Research Foundation["2020A1515111126","2020A1515110831","2019B1515120083"] ; Shenzhen Peacock Team Project[KQTD2015033110182370] ; Shenzhen Engineering R&D Center for Flexible Solar Cells Project funding[2019-126] ; City University of Hong Kong Strategic Research Grant[7005505]

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

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

WOS:000811136600001

WILEY-V C H VERLAG GMBH

20222412233557

Carbon nitride ; Electroluminescence ; Energy dissipation ; Metals ; Organic light emitting diodes (OLED) ; Quantum efficiency

Energy Losses (industrial and residential):525.4 ; Electricity: Basic Concepts and Phenomena:701.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Light, Optics and Optical Devices:741 ; Light/Optics:741.1 ; Quantum Theory; Quantum Mechanics:931.4

2-s2.0-85131807575

Scopus

1.Shenzhen Engineering Center for the Fabrication of Two-Dimensional Atomic Crystals,Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen,518055,China
2.Department of Materials Science and Engineering and Shenzhen Engineering Research and Development Center for Flexible Solar Cells,Southern University of Science and Technology,Shenzhen,518055,China
3.Wuhan Institute of Advanced Technology,Chinese Academy of Sciences,Wuhan,430000,China
4.College of Engineering and Applied Sciences,Nanjing National Laboratory of Microstructures,Nanjing University,Nanjing,210093,China
5.Department of Physics,Department of Materials Science and Engineering,and Department of Biomedical Engineering,City University of Hong Kong,Kowloon,Tat Chee Avenue,999077,Hong Kong

He，Xingchen,Meng，Lingqiang,Liu，Yanliang,et al. Carbon Nitride with Rationally Designed π-Conjugated Structure for Bright Blue-Violet Light-Emitting Diodes[J]. Small,2022,18.

He，Xingchen.,Meng，Lingqiang.,Liu，Yanliang.,Zhang，Xue.,Cheng，Ziqiang.,...&Yu，Xue Feng.(2022).Carbon Nitride with Rationally Designed π-Conjugated Structure for Bright Blue-Violet Light-Emitting Diodes.Small,18.

He，Xingchen,et al."Carbon Nitride with Rationally Designed π-Conjugated Structure for Bright Blue-Violet Light-Emitting Diodes".Small 18(2022).