Bright high-colour-purity deep-blue carbon dot light-emitting diodes via efficient edge amination

Deep-blue light-emitting diodes (LEDs) (emitting at wavelengths of less than 450 nm) are important for solid-state lighting, vivid displays and high-density information storage. Colloidal quantum dots, typically based on heavy metals such as cadmium and lead, are promising candidates for deep-blue L...

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Bibliographic Details
Published in:Nature photonics 2020-03, Vol.14 (3), p.171-176
Main Authors: Yuan, Fanglong, Wang, Ya-Kun, Sharma, Geetu, Dong, Yitong, Zheng, Xiaopeng, Li, Peicheng, Johnston, Andrew, Bappi, Golam, Fan, James Z., Kung, Hao, Chen, Bin, Saidaminov, Makhsud I., Singh, Kamalpreet, Voznyy, Oleksandr, Bakr, Osman M., Lu, Zheng-Hong, Sargent, Edward H.
Format: Article
Language:English
Subjects:
119/118
140/133
140/146
639/301/1019/1020
639/301/357/1017
Amination
Applied and Technical Physics
Cadmium
Carbon
Carbon dots
Color
Computer applications
Emission
Emissions
Heavy metals
Information storage
Light emitting diodes
Optical properties
Passivity
Photoluminescence
Photons
Physics
Physics and Astronomy
Purity
Quantum dots
Quantum efficiency
Quantum Physics
Structural analysis
Wavelengths
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Summary:Deep-blue light-emitting diodes (LEDs) (emitting at wavelengths of less than 450 nm) are important for solid-state lighting, vivid displays and high-density information storage. Colloidal quantum dots, typically based on heavy metals such as cadmium and lead, are promising candidates for deep-blue LEDs, but these have so far had external quantum efficiencies lower than 1.7%. Here we present deep-blue light-emitting materials and devices based on carbon dots. The carbon dots produce emission with a narrow full-width at half-maximum (about 35 nm) with high photoluminescence quantum yield (70% ± 10%) and a colour coordinate (0.15, 0.05) closely approaching the standard colour Rec. 2020 (0.131, 0.046) specification. Structural and optical characterization, together with computational studies, reveal that amine-based passivation accounts for the efficient and high-colour-purity emission. Deep-blue LEDs based on these carbon dots display high performance with a maximum luminance of 5,240 cd m −2 and an external quantum efficiency of 4%, notably exceeding that of previously reported quantum-tuned solution-processed deep-blue LEDs. Deep-blue high-colour-purity light-emitting materials are developed by using amine-based edge passivation. The light-emitting diodes based on the carbon dots exhibit a maximum luminance of 5,240 cd m –2 and an external quantum efficiency of 4%.
ISSN:1749-4885
1749-4893
DOI:10.1038/s41566-019-0557-5