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Light Converting Polymer/Si Nanocrystal Composites with Stable 60-70% Quantum Efficiency and their Glass Laminates
KTH, School of Engineering Sciences (SCI), Applied Physics.
(Micro and Nanosystems)ORCID iD: 0000-0003-4322-6192
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics.
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2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252Article in journal, Letter (Refereed) Published
Abstract [en]

Thiol-ene polymer/Si nanocrystal bulk hybrids were synthesized from alkyl-passivated Si nanocrystal (Si NC) toluene solutions. Radicals in the polymer provided a co-passivation of “dark” Si NCs, making them optically active and leading to a substantial ensemble quantum yield increase. Optical stability over several months was confirmed. The presented materials exhibit the highest photoluminescence quantum yield (~65%) of any solid-state Si NC hybrid reported to date. The broad tunability of thiol-ene polymer reactivity provides facile glass integration, as demonstrated by a laminated structure. This, together with extremely fast polymerization, makes the demonstrated hybrid material a promising candidate for light converting applications.

Place, publisher, year, edition, pages
2017.
Keywords [en]
Si nanocrystals, polymers, photoluminescence, photovoltaics, hybrids, laminates, OSTE
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-213457DOI: 10.1021/acsami.7b09265ISI: 000411043600006Scopus ID: 2-s2.0-85029458862OAI: oai:DiVA.org:kth-213457DiVA, id: diva2:1137463
Note

QC 20170831

Available from: 2017-08-31 Created: 2017-08-31 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Polymer Components for Photonic Integrated Circuits
Open this publication in new window or tab >>Polymer Components for Photonic Integrated Circuits
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Optical polymers are a subject of research and industry implementation for many decades. Optical polymers are inexpensive, easy to process and flexible enough to meet a broad range of application-specific requirements. These advantages allow a development of cost-efficient polymer photonic integrated circuits for on-chip optical communications. However, low refractive index contrast between core and cladding limits light confinement in a core and, consequently, integrated polymer device miniaturization. Also, polymers lack active functionality like light emission, amplification, modulation, etc. In this work, we improved a performance of integrated polymer waveguides and demonstrated active waveguide devices. Also, we present novel Si QD/polymer optical materials.

In the integrated device part, we demonstrate optical waveguides with enhanced performance. Decreased radiation losses in air-suspended curved waveguides allow low-loss bending with radii of only 15 µm, which is far better than >100 µm for typical polymer waveguides. Another study shows a positive effect of thermal treatment on acrylate waveguides. By heating higher than polymer glass transition temperature, surface roughness is reflown, minimizing scattering losses. This treatment method enhances microring resonator Q factor more than 2 times. We also fabricated and evaluated all-optical intensity modulator based on PMMA waveguides doped with Si QDs.

We developed novel hybrid optical materials. Si QDs are encapsulated into PMMA and OSTE polymers. Obtained materials show stable photoluminescence with high quantum yield. We achieved the highest up to date ~65% QY for solid-state Si QD composites. Demonstrated materials are a step towards Si light sources and active devices.

Integrated devices and materials presented in this work enhance the performance and expand functionality of polymer PICs. The components described here can also serve as building blocks for on-chip sensing applications, microfluidics, etc.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 60
Series
TRITA-FYS, ISSN 0280-316X ; 2017:66
Keywords
integrated photonics, polymers, optical communications, microfabrication, optical waveguides, microring resonators, silicon, Si nanocrystals, photoluminescence
National Category
Engineering and Technology
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-219556 (URN)978-91-7729-576-1 (ISBN)
Public defence
2017-11-24, Sal C, Isafjordsgatan 22, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20171207

Available from: 2017-12-07 Created: 2017-12-07 Last updated: 2017-12-07Bibliographically approved

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