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Near-Unity Photoluminescence Quantum Yield of Core-Only InP Quantum Dots via a Simple Postsynthetic InF₃ Treatment

Stam, M. (author), Gonçalves Pereira Fonseca DeAl, G.P.F. (author), Ubbink, R.F. (author), van der Poll, L.M. (author), Vogel, Y.B. (author), Chen, H. (author), Giordano, Luca (author), Schiettecatte, Pieter (author), Hens, Zeger (author), Houtepen, A.J. (author)

Indium phosphide (InP) quantum dots (QDs) are considered the most promising alternative for Cd and Pb-based QDs for lighting and display applications. However, while core-only QDs of CdSe and CdTe have been prepared with near-unity photoluminescence quantum yield (PLQY), this is not yet achieved for InP QDs. Treatments with HF have been used...

journal article 2024

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Shaping the nanoworld: From precursors to functional nanocrystals

Mulder, J.T. (author)

doctoral thesis 2023

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Traps in the spotlight: How traps affect the charge carrier dynamics in Cs₂AgBiBr₆ perovskite

Caselli, V.M. (author), Thieme, J. (author), Jöbsis, Huygen J. (author), Phadke, S.A. (author), Zhao, J. (author), Hutter, Eline M. (author), Savenije, T.J. (author)

Suitable optoelectronic properties of lead halide perovskites make these materials interesting semiconductors for many applications. Toxic lead can be substituted by combining monovalent and trivalent cations, such as in Cs₂AgBiBr₆. However, efficiencies of Cs₂AgBiBr₆-based photovoltaics are still...

journal article 2022

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The interaction of light with WS2 nanostructures

Komen, I. (author)

In this thesis we describe three results of the interaction between WS2 and light: photoluminescence, the formation of exciton-polaritons and Raman scattering. The chirality of the photoluminescence interaction between WS2 and light opens the way for applictions in nanophotonics and specifically valleytronics, the field of interacting with and...

doctoral thesis 2021

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Photon Recycling in CsPbBr₃All-Inorganic Perovskite Nanocrystals

van der Laan, M. (author), De Weerd, Chris (author), Poirier, Lucas (author), van de Water, O.P. (author), Poonia, D. (author), Gomez, Leyre (author), Kinge, S.S. (author), Siebbeles, L.D.A. (author), Koenderink, A. Femius (author)

Photon recycling, the iterative process of re-Absorption and re-emission of photons in an absorbing medium, can play an important role in the power-conversion efficiency of photovoltaic cells. To date, several studies have proposed that this process may occur in bulk or thin films of inorganic lead-halide perovskites, but conclusive proof of...

journal article 2021

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Photoluminescence and excited states dynamics of Tm²⁺-doped CsCa(Cl/Br)₃ and CsCa(Br/I)₃ perovskites

Plokker, M.P. (author), Biner, D. A. (author), Dusoswa, N. (author), Dorenbos, P. (author), Krämer, K. W. (author), van der Kolk, E. (author)

In this study, we systematically vary the Cl/Br and Br/I ratios in CsCaX₃:Tm²⁺ (X = Cl, Br, I) and hereby gradually shift the positions of the Tm²⁺ 4f¹²5d¹-levels as relative to the two 4f¹³ levels. At low temperatures up to five distinct Tm²⁺ 4f¹²5d<sup>1...

journal article 2021

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Experimental and numerical analysis of Tm²⁺ excited-states dynamics and luminescence in CaX₂ (X = Cl, Br, I)

Plokker, M.P. (author), van der Knijff, I.C. (author), de Wit, A.V. (author), Voet, B. (author), Woudstra, T. (author), Khanin, V. (author), Dorenbos, P. (author), van der Kolk, E. (author)

The prospect of using Tm²⁺-doped halides for luminescence solar concentrators (LSCs) requires a thorough understanding of the temperature dependent Tm²⁺ excited states dynamics that determines the internal quantum efficiency (QE) and thereby the efficiency of the LSC. In this study we investigated the dynamics in CaX<sub...

journal article 2021

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Effect of Structural Defects and Impurities on the Excited State Dynamics of 2D BA₂PbI₄ Perovskite

Gelvez Rueda, M.C. (author), Peeters, Sicco (author), Wang, Peng Cheng (author), Felter, K.M. (author), Grozema, F.C. (author)

In this work, we show that the quality of the precursor and the thin film preparation strongly affect the optoelectronic properties of the 2D perovskite BA₂PbI₄. 2D perovskites with alkylammonium organic cations such as butylammonium (BA) are relatively soft structures that exhibit large dynamic disorder and phase...

journal article 2020

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New insights into the complex photoluminescence behaviour of titanium white pigments

van Driel, B.A. (author), Artesani, A. (author), van den Berg, K.J. (author), Dik, J. (author), Mosca, S. (author), Rossenaar, B. (author), Hoekstra, J. (author), Davies, A. (author), Nevin, A. (author), Valentini, G. (author), Comelli, D. (author)

This work reports the analysis of the time-resolved photoluminescence behaviour on the nanosecond and microsecond time scale of fourteen historical and contemporary titanium white pigments. The pigments were produced with different production methods and post-production treatments, giving rise to a remarkable variability of titanium dioxide...

journal article 2018

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Crystal Phase Quantum Well Emission with Digital Control

Assali, S. (author), Lähnemann, J. (author), Vu, TTT (author), Jöns, K.D. (author), Gagliano, L (author), Verheijen, M. A. (author), Akopian, N. (author), Bakkers, E.P.A.M. (author), Haverkort, J. E.M. (author)

One of the major challenges in the growth of quantum well and quantum dot heterostructures is the realization of atomically sharp interfaces. Nanowires provide a new opportunity to engineer the band structure as they facilitate the controlled switching of the crystal structure between the zinc-blende (ZB) and wurtzite (WZ) phases. Such a...

journal article 2017

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Metal Halide Perovskite Polycrystalline Films Exhibiting Properties of Single Crystals

Brenes, Roberto (author), Guo, Dengyang (author), Osherov, Anna (author), Noel, Nakita K. (author), Eames, Christopher (author), Hutter, E.M. (author), Pathak, Sandeep K. (author), Niroui, Farnaz (author), Friend, Richard H. (author), Islam, M. Saiful (author), Snaith, Henry J. (author), Bulović, Vladimir (author), Savenije, T.J. (author), Stranks, Samuel D. (author)

Metal halide perovskites are generating enormous excitement for use in solar cells and light-emission applications, but devices still show substantial non-radiative losses. Here, we show that by combining light and atmospheric treatments, we can increase the internal luminescence quantum efficiencies of polycrystalline perovskite films from 1...

journal article 2017

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Morphology and photoluminescence of nanostructured oxides grown by copper passivation in aqueous potassium hydroxide solution

Stepniowski, W.J. (author), Stojadinović, Stevan (author), Vasilić, Rastko (author), Tadić, Nenad (author), Karczewski, Krzysztof (author), Abrahami, S.T. (author), Buijnsters, J.G. (author), Mol, J.M.C. (author)

Copper foil was anodized in 1 M KOH at potentials ranging from −400 to −100 mV vs. Ag|AgCl electrode. Cyclic voltammetry showed a distinct peak with a maximum at around −150 mV. For anodizing at −100 and −200 mV, nanowires with diameters of ca. 19 and 24 nm respectively were found to be grown. Moreover, photoluminescence and X-ray diffraction...

journal article 2017

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Scaling and Modelling Photoluminescence of Si Nanoparticles Embedded in Silicon Oxide

Quik, J. (author)

Silicon nanoparticles (NPs) embedded in a dielectric matrix, such as silicon oxide, pose a promising candidate for all-silicon multi-junction solar cells. This material is often analysed with photoluminescence (PL) measurements. In literature, the intensities of different PL measurements are either directly compared or normalized. Normalization...

master thesis 2016

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Optical properties of strained wurtzite gallium phosphide nanowires

Greil, J. (author), Assali, S. (author), Isono, Y. (author), Belabbes, A. (author), Bechstedt, F. (author), Valega MacKenzie, F. O. (author), Silov, A. Yu (author), Bakkers, E.P.A.M. (author), Haverkort, J.E.M. (author)

Wurtzite gallium phosphide (WZ GaP) has been predicted to exhibit a direct bandgap in the green spectral range. Optical transitions, however, are only weakly allowed by the symmetry of the bands. While efficient luminescence has been experimentally shown, the nature of the transitions is not yet clear. Here we apply tensile strain up to 6%...

journal article 2016

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Charge Injection, Charge Trapping and Charge Transfer in Quantum-Dot Solids

Boehme, S.C. (author)

This study reports on fundamental processes in Quantum-Dot Solids, after light absorption. Transient Absorption and Time-resolved Photoluminescence spectrocopy reveal the dynamics of charge transfer and charge trapping processes. Typically, both occur on a picosecond time scale and compete with each other. We find that the efficiency of these...

doctoral thesis 2015

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Efficiency enhancement calculations of state-of-the-art solar cells by luminescent layers with spectral shifting, quantum cutting, and quantum tripling function

Ten Kate, O.M. (author), De Jong, M. (author), Hintzen, H.T. (author), Van der Kolk, E. (author)

Solar cells of which the efficiency is not limited by the Shockley-Queisser limit can be obtained by integrating a luminescent spectral conversion layer into the cell structure. We have calculated the maximum efficiency of state-of-the-art c-Si, pc-Si, a-Si, CdTe, GaAs, CIS, CIGS, CGS, GaSb, and Ge solar cells with and without an integrated...

journal article 2013

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Ultrahigh throughput plasma processing of free standing silicon nanocrystals with lognormal size distribution

Dogan, I. (author), Kramer, N.J. (author), Westermann, R.H.J. (author), Dohnalova, K. (author), Smets, A.H.M. (author), Verheijen, M.A. (author), Greogorkiewicz, T. (author), Van de Sanden, M.C.M. (author)

We demonstrate a method for synthesizing free standing silicon nanocrystals in an argon/silane gas mixture by using a remote expanding thermal plasma. Transmission electron microscopy and Raman spectroscopy measurements reveal that the distribution has a bimodal shape consisting of two distinct groups of small and large silicon nanocrystals with...

journal article 2013

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Optical polarization properties of a nanowire quantum dot probed along perpendicular orientations

Bugarini, G. (author), Reimer, M.E. (author), Zwiller, V. (author)

We report on the optical properties of single quantum dots in nanowires probed along orthogonal directions. We address the same quantum dot from either the nanowire side or along the nanowire axis via reflection on a micro-prism. The collected photoluminescence intensity from nanowires lying on a substrate is improved 3-fold using the prism as...

journal article 2012

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Direct hole and delayed electron capture on a picosecond timescale by Eu2+ centers in CaGa2S4 monitored by synchroscan with horizontal blanking

Louwers, D.J. (author), Takizawa, T. (author), Hidaka, C. (author), Van der Kolk, E. (author)

A Eu2+ concentration and temperature dependent energy transfer study from the host lattice to Eu2+ luminescence centers in Ca(1–x)EuxGa2S4 (x = 0.001 to 0.05) was performed with a special streak camera that combines the high timing resolution of a conventional synchroscan operation (<2 ps) with the ability to study long lived states (10?ns???1...

journal article 2012

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Spontaneous emission control of single quantum dots in bottom-up nanowire waveguides

Bulgarini, G. (author), Reimer, M.E. (author), Zehender, T. (author), Hocevar, M. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, L.P. (author), Zwiller, V. (author)

Nanowire waveguides with controlled shape are promising for engineering the collection efficiency of quantum light sources. We investigate the exciton lifetime in individual InAsP quantum dots, perfectly positioned on-axis of InP nanowire waveguides. We demonstrate control over the quantum dot spontaneous emission by varying the nanowire...

journal article 2012