Over a thousand-fold enhancement of the spontaneous emission rate for stable core−shell perovskite quantum dots through coupling with novel plasmonic nanogaps
Author:
Silalahi Vanna Chrismas1, Kim Dokyum2ORCID, Kim Minjun1, Adhikari Samir1, Jun Seongmoon3, Cho Yong-Hoon3, Lee Donghan14, Lee Chang-Lyoul2ORCID, Jang Yudong4ORCID
Affiliation:
1. Department of Physics , Chungnam National University , Daejeon 34134 , Republic of Korea 2. Advanced Photonics Research Institute (APRI) , Gwangju Institute of Science and Technology (GIST) , Gwangju 61005 , Republic of Korea 3. Department of Physics and KI for the NanoCentury , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea 4. Institute of Quantum Systems (IQS) , Chungnam National University , Daejeon 34134 , Republic of Korea
Abstract
Abstract
High Purcell enhancement structures and stable emitters are essential prerequisites for the successful development of novel fast-operating active devices. Furthermore, a uniform enhancement of the spontaneous emission rate is critical for practical applications. Despite considerable efforts being made to meet these requirements, achieving them still remains a challenging task. In this work, we demonstrate that placing stable core−shell perovskite quantum dots (PQDs) in the nanogap region of hole/sphere-based nanogap structures (HSNGs) can enhance the spontaneous emission rate by more than a thousand-fold (up to a factor of ∼1080) compared to PQDs in solution. This enhancement factor is the highest value reported using PQDs, exceeding previously reported values by two orders of magnitude. Notably, the enhancement factor of the emission rate in the HSNG maintains large values across the samples, with values ranging from ∼690 to ∼1080. Furthermore, the structural stabilities of the PQDs are remarkably enhanced with the incorporation of SiO2 shells, which is validated by monitoring the changes in photoluminescence intensities over time during continuous laser exposure. As a result, the HSNG with stable core−shell PQDs offers great potential for fast optical device applications that require high performance and long-term operational stability.
Funder
Gwangju Institute of Science and Technology Ministry of Science and ICT, South Korea
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
Reference27 articles.
1. T. B. Hoang, G. M. Akselrod, C. Argyropoulos, J. Huang, D. R. Smith, and M. H. Mikkelsen, “Ultrafast spontaneous emission source using plasmonic nanoantennas,” Nat. Commun., vol. 6, no. 1, p. 7788, 2015. https://doi.org/10.1038/ncomms8788. 2. G. M. Akselrod, et al.., “Probing the mechanisms of large Purcell enhancement in plasmonic nanoantennas,” Nat. Photonics, vol. 8, no. 11, pp. 835–840, 2014. https://doi.org/10.1038/nphoton.2014.228. 3. T. B. Hoang, G. M. Akselrod, and M. H. Mikkelsen, “Ultrafast room-temperature single photon emission from quantum dots coupled to plasmonic nanocavities,” Nano Lett., vol. 16, no. 1, pp. 270–275, 2016. https://doi.org/10.1021/acs.nanolett.5b03724. 4. E. M. Purcell, “Spontaneous emission probabilities at radio frequencies,” Phys. Rev., vol. 69, nos. 11–12, p. 681, 1946. https://doi.org/10.1007/978-1-4615-1963-8_40. 5. K. J. Vahala, “Optical microcavities,” Nature, vol. 424, no. 6950, pp. 839–846, 2003. https://doi.org/10.1038/nature01939.
|
|