Quantum dot light-emitting diodes are promising light sources for applications in displays. However, to date, there have been no reports of devices that simultaneously offer both high brightness and high external quantum efficiency. Here, we report red, green and blue quantum dot light-emitting diodes based on CdSe/ZnSe core/shell structures that have these attributes. We demonstrate devices with maximum external quantum efficiencies of 21.6%, 22.9% and 8.05% for red, green and blue colours with corresponding brightness of 13,300 cd m–2, 52,500 cd m–2 and 10,100 cd m–2. The devices also offer peak luminance of 356,000 cd m–2, 614,000 cd m–2 and 62,600 cd m–2, respectively. We postulate that this high performance is due to the use of Se throughout the core/shell regions and the existence of alloyed bridging layers at the core/shell interfaces. This study suggests that in the future visible quantum dot light-emitting diodes will also be suitable for lighting applications.
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The data that support the plots within this paper and other findings of this study are available from the corresponding authors upon reasonable request.
Li, X. et al. Bright colloidal quantum dot light-emitting diodes enabled by efficient chlorination. Nat. Photon. 12, 159–164 (2018).
Dai, X. et al. Solution-processed, high-performance light-emitting diodes based on quantum dots. Nature 515, 96–99 (2014).
Zhang, H., Chen, S. & Sun, X. W. Efficient red/green/blue tandem quantum-dot light-emitting diodes with external quantum efficiency exceeding 21%. ACS Nano 12, 697–704 (2018).
Colvin, V. L., Schlamp, M. C. & Alivisatos, A. P. Light-emitting-diodes made from cadmium selenide nanocrystals and a semiconducting polymer. Nature 370, 354–357 (1994).
Coe, S., Woo, W. K., Bawendi, M. & Bulović, V. Electroluminescence from single monolayers of nanocrystals in molecular organic devices. Nature 420, 800–803 (2002).
Sun, Q. et al. Bright, multicoloured light-emitting diodes based on quantum dots. Nat. Photon. 1, 717–722 (2007).
Cho, K. S. et al. High-performance crosslinked colloidal quantum-dot light emitting diodes. Nat. Photon. 3, 341–345 (2009).
Qian, L., Zheng, Y., Xue, J. & Holloway, P. H. Stable and efficient quantum-dot light-emitting diodes based on solution-processed multilayer structures. Nat. Photon. 5, 543–548 (2011).
Shirasaki, Y., Supran, G. J., Bawendi, M. G. & Bulović, V. Emergence of colloidal quantum-dot light-emitting technologies. Nat. Photon. 7, 13–23 (2013).
Mashford, B. S. et al. High-efficiency quantum-dot light-emitting devices with enhanced charge injection. Nat. Photon. 7, 407–412 (2013).
Yang, Y. et al. High-efficiency light-emitting devices based on quantum dots with tailored nanostructures. Nat. Photon. 9, 259–266 (2015).
Li, Z. et al. Efficient and long-life green light-emitting diodes comprising tridentate thiol capped quantum dots. Laser Photon. Rev. 11, 1600227 (2017).
Ding, K. et al. Polyethylenimine insulativity-dominant charge-injection balance for highly efficient inverted quantum dot light-emitting diodes. ACS Appl. Mater. Interfaces 9, 20231–20238 (2017).
Kwak, J. et al. Bright and efficient full-color colloidal quantum dot light-emitting diodes using an inverted device structure. Nano Lett. 12, 2362–2366 (2012).
Shen, H. et al. High-efficiency, low turn-on voltage blue-violet quantum-dot based light-emitting diodes. Nano Lett. 15, 1211–1216 (2015).
Dabbousi, B. O. et al. (CdSe)ZnS core–shell quantum dots: synthesis and optical and structural characterization of a size series of highly luminescent materials. J. Phys. Chem. B 101, 9463–9475 (1997).
Wei, S. & Zunger, A. Calculated natural band offsets of all II–VI and III–V semiconductors: chemical trends and the role of cation d orbitals. Appl. Phys. Lett. 72, 2011–2013 (1998).
McCaldin, J. O., McGill, T. C. & Mead, C. A. Correlation for III-V and II-VI semiconductors of the gold Schottky barrier energy with anion electronegativity. Phys. Rev. Lett. 36, 56–58 (1976).
Shen, H. et al. High-efficient deep-blue light-emitting diodes by using high quality ZnxCd1−xS/ZnS core/shell quantum dots. Adv. Funct. Mater. 24, 2367–2373 (2014).
Dong, Y. et al. Ultra-bright, highly efficient, low roll-off inverted quantum-dot light emitting devices (QLEDs). SID Symp. Digest Technical Papers 1, 46 (2015).
Zhang, L. et al. Ultra-bright and highly efficient inorganic based perovskite light-emitting diodes. Nat. Commun. 8, 15640–15647 (2017).
Zhang, H., Sun, X. & Chen, S. Over 100 cd A−1 efficient quantum dot light-emitting diodes with inverted tandem structure. Adv. Funct. Mater. 27, 1700610–1700617 (2017).
Scholz, S., Kondakov, D., Lussem, B. & Leo, K. Degradation mechanisms and reactions in organic light-emitting devices. Chem. Rev. 115, 8449–8503 (2015).
Lin, Q. et al. Nonblinking quantum-dot-based blue light-emitting diodes with high efficiency and a balanced charge-injection process. ACS Photon. 5, 939–946 (2018).
Zeng, J., Cui, P. & Zhang, Z. Half layer by half layer growth of a blue phosphorene monolayer on a GaN (001) substrate. Phys. Rev. Lett. 118, 046101 (2017).
Zhang, Z. & Lagally, M. G. Atomistic processes in the early stages of thin-film growth. Science 276, 377–383 (1997).
Mott, N. F. & Gurney, R. W. Electronic Processes in Ionic Crystals 1st edn (Oxford University Press, Oxford, 1940).
Pu, C. et al. Synthetic control of exciton behavior in colloidal quantum dots. J. Am. Chem. Soc. 139, 3302–3311 (2017).
Bozyigit, D. & Wood, V. Challenges and solutions for high efficiency quantum dot-based LEDs. MRS Bull. 38, 731–736 (2013).
Lv, B. et al. Photon antibunching in a cluster of giant CdSe/CdS nanocrystals. Nat. Commun. 9, 1536–1543 (2018).
Beane, G. A., Gong, K. & Kelley, D. F. Auger and carrier trapping dynamics in core/shell quantum dots having sharp and alloyed interfaces. ACS Nano 10, 3755–3765 (2016).
Zhang, Q. et al. Highly luminescent red emitting CdZnSe/ZnSe quantum dots synthesis and application for quantum dot light emitting diodes. Opt. Mater. Express 7, 3875–3884 (2017).
Shen, H. et al. High quality synthesis of monodisperse zinc-blende CdSe and CdSe/ZnS nanocrystals with a phosphine-free method. CrystEngComm 11, 1733–1738 (2009).
Okamoto, S. et al. Simple measurement of quantum efficiency in organic electroluminescent devices. Jpn. J. Appl. Phys. 40, L783–L784 (2001).
Forrest, S. R., Bradley, D. D. C. & Thompson, M. E. Measuring the efficiency of organic light-emitting devices. Adv. Mater. 15, 1043–1048 (2003).
We gratefully acknowledge the financial support from the National Natural Science Foundation of China (grant numbers 61474037, 61874039, 11634011, 61434002, 11722435, 11504357, 11404314 and 21671058), Key Project of National Natural Science Foundation of China (grant number U1604261), National Key Basic Research Programme of China (grant number 2017YFA0303500), and the Natural Science Foundation of Anhui Province (1708085MA06).
The authors declare no competing interests.
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Shen, H., Gao, Q., Zhang, Y. et al. Visible quantum dot light-emitting diodes with simultaneous high brightness and efficiency. Nature Photon 13, 192–197 (2019). https://doi.org/10.1038/s41566-019-0364-z
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