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Light Converting Polymer/Si Nanocrystal Composites with Stable 60-70% Quantum Efficiency and their Glass Laminates
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
(Micro and Nanosystems)ORCID-id: 0000-0003-4322-6192
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
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2017 (Engelska)Ingår i: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252Artikel i tidskrift, Letter (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2017.
Nyckelord [en]
Si nanocrystals, polymers, photoluminescence, photovoltaics, hybrids, laminates, OSTE
Nationell ämneskategori
Nanoteknik
Identifikatorer
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
Anmärkning

QC 20170831

Tillgänglig från: 2017-08-31 Skapad: 2017-08-31 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
Ingår i avhandling
1. Polymer Components for Photonic Integrated Circuits
Öppna denna publikation i ny flik eller fönster >>Polymer Components for Photonic Integrated Circuits
2017 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2017. s. 60
Serie
TRITA-FYS, ISSN 0280-316X ; 2017:66
Nyckelord
integrated photonics, polymers, optical communications, microfabrication, optical waveguides, microring resonators, silicon, Si nanocrystals, photoluminescence
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
Fysik
Identifikatorer
urn:nbn:se:kth:diva-219556 (URN)978-91-7729-576-1 (ISBN)
Disputation
2017-11-24, Sal C, Isafjordsgatan 22, Stockholm, 14:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20171207

Tillgänglig från: 2017-12-07 Skapad: 2017-12-07 Senast uppdaterad: 2017-12-07Bibliografiskt granskad

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Av författaren/redaktören
Marinins, AleksandrsZandi Shafagh, Rezavan der Wijngaart, WouterHaraldsson, TommyLinnros, JanPopov, SergeiSychugov, Ilya
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