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The effect of annealing and photoactivation on the optical transitions of band–band and surface trap states of colloidal quantum dots in PMMA
Abstract
For optoelectronic applications, colloidal CdSe quantum dots (QDs) have been integrated into solid devices by using optically transparent polymer matrices that embedded the colloidal QDs. We systematically studied the effect of annealing and photoactivation on the band-band (BB) and surface trap state (STS) transitions of colloidal CdSe QDs embedded in polymethylmethacrylate (QDs-PMMA). The QDs-PMMA composites demonstrate enhancement of the STS emissions while their annealing leads to an intensity quench of both BB and STS emissions. The annealing process also causes the red shift of the BB emission. By contrast, photoactivation of QDs-PMMA composites results in the remarkable recovery of luminescence intensity accompanied by blue shift of the emissions. Furthermore, it is found in the photoactivation process that the STS emission can be saturated earlier than the BB emission, which renders it possible to tune the light color of the emissions. The combination of annealing and photoactivation could undoubtedly provide an effective way to precisely tune the colors of light-emitting devices that use colloidal CdSe QDs.
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“In the case of CdS QDs, a broad PL band is observed at around 620 nm that is attributed to carriers trapped at surface states [5].”
From Polymer/QDs Nanocomposites for Waveguiding Applications (2012) · cites this paper as [5]
In the citing paper
“We can also observe a broader and weaker PL band centered at around 620 nm corresponding PMMA/PbS PL counts (a.u.) 900 950 1000 1050 1100 1150 1200 Wavelength (nm) Figure 8: Waveguiding PL spectrum of a PMM/PbS waveguide obtained by end-fire coupling.”
From Polymer/QDs Nanocomposites for Waveguiding Applications (2012) · cites this paper as [5]
In the citing paper
“The PL tail observed at long wavelengths is associated to the surface states of CdS (see Figure 6).”
From Polymer/QDs Nanocomposites for Waveguiding Applications (2012) · cites this paper as [5]
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Polymer/QDs Nanocomposites for Waveguiding Applications
Gordillo, H., Suárez, I., Abargues, R., Rodríguez-Cantó, P., Albert, S., & Martínez-Pastor, J. P. (2012) · Journal of Nanomaterials · doi:10.1155/2012/960201 · Cited by 49
“The incorporation of optically active materials such as organic dyes [3], rare earth ions [4], semiconducting [5], and metal nanoparticles [6] into polymers has found multitude of applications in optical amplification [7], photovoltaics [8], photodetection [9], sensing [10], and plasmonics [11].”
Background
Metadata
- Authors
- Hu, L., Wu, H., Du, L., Ge, H., Chen, X., & Dai, N.
- Affiliations
- State Key Laboratory of Silicon Materials (CN)
- Chinese Academy of Sciences (CN)
- Venue
- Nanotechnology
- Publisher
- IOP Publishing
- Published
- 2011-02-14
- Volume
- 22
- Issue
- 12
- Pages
- 125202
- ISSN
- 0957-4484 (ISSN-L)
- 1361-6528
- OpenAlex
- W1983981466
- Cited by
- 38
- References
- 0
- Citations by year
- 2022: 1 · 2020: 1 · 2019: 5 · 2018: 5 · 2017: 5 · 2016: 1 · 2015: 1 · 2014: 5 · 2013: 7 · 2012: 4
- FWCI
- 2.98
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Nanotechnology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Quantum Dots Synthesis And Properties
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Semiconductor Quantum Structures and Devices
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Photonic Crystals and Applications
- Keywords
- colloidal quantum dots, CdSe quantum dots, poly(methyl methacrylate), annealing, photoactivation, surface trap states, luminescence quenching, luminescence recovery, emission color tuning, red shift, blue shift
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