The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.
High-Efficiency, Low Turn-on Voltage Blue-Violet Quantum-Dot-Based Light-Emitting Diodes
Abstract
We report high-efficiency blue-violet quantum-dot-based light-emitting diodes (QD-LEDs) by using high quantum yield ZnCdS/ZnS graded core-shell QDs with proper surface ligands. Replacing the oleic acid ligands on the as-synthesized QDs with shorter 1-octanethiol ligands is found to cause a 2-fold increase in the electron mobility within the QD film. Such a ligand exchange also results in an even greater increase in hole injection into the QD layer, thus improving the overall charge balance in the LEDs and yielding a 70% increase in quantum efficiency. Using 1-octanethiol capped QDs, we have obtained a maximum luminance (L) of 7600 cd/m(2) and a maximum external quantum efficiency (ηEQE) of (10.3 ± 0.9)% (with the highest at 12.2%) for QD-LEDs devices with an electroluminescence peak at 443 nm. Similar quantum efficiencies are also obtained for other blue/violet QD-LEDs with peak emission at 455 and 433 nm. To the best of our knowledge, this is the first report of blue QD-LEDs with ηEQE > 10%. Combined with the low turn-on voltage of ∼2.6 V, these blue-violet ZnCdS/ZnS QD-LEDs show great promise for use in next-generation full-color displays.
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Citations
Cites
Bright, multicoloured light-emitting diodes based on quantum dots
Sun, Q., Wang, Y. A., Li, L. S., Wang, D., Zhu, T., Xu, J., Yang, C., & Li, Y. (2007) · Nature Photonics · doi:10.1038/nphoton.2007.226 · Cited by 1,147
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Cited by
Spectroscopic and Device Aspects of Nanocrystal Quantum Dots
Pietryga, J. M., Park, Y.-S., Lim, J., Fidler, A. F., Bae, W. K., Brovelli, S., & Klimov, V. I. (2016) · Chemical Reviews · doi:10.1021/acs.chemrev.6b00169 · Cited by 1,040
Li, Y., Hou, X., Dai, X., Yao, Z., Lv, L., Jin, Y., & Peng, X. (2019) · Journal of the American Chemical Society · doi:10.1021/jacs.8b12908 · Cited by 422
Perovskite Quantum Dots and Their Application in Light‐Emitting Diodes
Wang, H., Bao, Z., Tsai, H., Tang, A., & Liu, R. (2018) · Small · doi:10.1002/smll.201702433 · Cited by 355
On the degradation mechanisms of quantum-dot light-emitting diodes
Chen, S., Cao, W., Liu, T., Tsang, S.-W., Yang, Y., Yan, X., & Qian, L. (2019) · Nature Communications · doi:10.1038/s41467-019-08749-2 · Cited by 299
Self-citationA Bioinspired Stretchable Sensory‐Neuromorphic System
Kim, S. H., Baek, G. W., Yoon, J., Seo, S., Park, J., Hahm, D., Chang, J. H., Seong, D., Seo, H., Oh, S., et al. (2021) · Advanced Materials · doi:10.1002/adma.202104690 · Cited by 142
Metadata
- Authors
- Shen, H., Cao, W., Shewmon, N. T., Yang, C., Li, L. S., & Xue, J.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-01-13
- Volume
- 15
- Issue
- 2
- Pages
- 1211-1216
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2328886960
- Cited by
- 421
- References
- 1
- FWCI
- 24.11
- Type
- journal article
- Language
- en
- Open access
- closed
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