High Internal Emission Efficiency of Silicon Nanoparticles Emitting in the Visible Range

Dam, Bart van; Osorio, Clara I.; Hink, Mark A.; Muller, Remmert; Koenderink, A. Femius; Dohnalová, Kateřina

doi:10.1021/acsphotonics.7b01624

Cited by 16 publications

(17 citation statements)

References 58 publications

(134 reference statements)

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“…With the distance-dependent lifetimes ( ), LDOS ( ) and QE , analogue to Ref. [30,31]. Accordingly, a change in LDOS is mediated by changing the mirror distance, which nally reveals the QE.…”

Section: Methodsmentioning

confidence: 93%

Direct measurement of quantum efficiency of single-photon emitters in hexagonal boron nitride

Nikolay

Mendelson

Özelci

et al. 2019

Optica

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Single photon emi ers in two-dimensional materials are promising candidates for future generation of quantum photonic technologies. In this work, we experimentally determine the quantum e ciency (QE) of single photon emi ers (SPE) in few-layer hexagonal boron nitride (hBN). We employ a metal hemisphere that is attached to the tip of an atomic force microscope to directly measure the lifetime variation of the SPEs as the tip approaches the hBN. is technique enables non-destructive, yet direct and absolute measurement of the QE of SPEs. We nd that the emi ers exhibit very high QEs approaching (87 ± 7) % at wavelengths of ≈ 580 nm, which is amongst the highest QEs recorded for a solid state single photon emi er.

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Section: Methodsmentioning

confidence: 93%

Direct measurement of quantum efficiency of single-photon emitters in hexagonal boron nitride

Nikolay

Mendelson

Özelci

et al. 2019

Optica

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“…We note that in many reports too little attention is paid in selecting the right function f (t) to fit to the data, as this is essential to adequately interpret nonexponential The widely adopted use of stretched exponentials to interpret nonexponential decay (see e.g., [128,116]) has a number of problems, notably regarding proper normalization, proper definition, and physical interpretation, see [126].…”

Section: Exponential Versus Non-exponential Decaymentioning

confidence: 99%

Classical antennas, quantum emitters, and densities of optical states

Barnes

Horsley

Vos

2020

J. Opt.

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We provide a pedagogical introduction to the concept of the local density of optical states (LDOS), illustrating its application to both the classical and quantum theory of radiation. We show that the LDOS governs the efficiency of a macroscopic classical antenna, determining how the antenna's emission depends on its environment. The LDOS is shown to similarly modify the spontaneous emission rate of a quantum emitter, such as an excited atom, molecule, ion, or quantum dot that is embedded in a nanostructured optical environment. The difference between the number density of optical states, the local density of optical states, and the partial local density of optical states is elaborated and examples are provided for each density of states to illustrate where these are required. We illustrate the universal effect of the LDOS on emission by comparing systems with emission wavelengths that differ by more than 5 orders of magnitude, and systems whose decay rates differ by more than 5 orders of magnitude. To conclude we discuss and resolve an apparent difference between the classical and quantum expressions for the spontaneous emission rate that often seems to be overlooked, and discuss the experimental determination of the LDOS. arXiv:1909.05619v1 [physics.optics] 12 Sep 2019Classical antennae, quantum emitters, and densities of optical states ‡ It is even more subtle: the two contributions are only equal under the assumption of a two level atom (see [2], chapter 4), but this is beyond the scope of the present article. § The excited-state lifetime τ is equivalent to the half-life t 1/2 that is well-known in nuclear physics: t 1/2 = τ ln(2).

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“…In view of this finding, it is instrumental to consider a hypothetical PL spectrum that would occur in case of a uniform exciton occupancy. We presume that the variation of the quantum yield with the size, which, as can be concluded from experimental observations, moderately depends on the SiQD diameter, can also be neglected in comparison to the decline in the number of large SiQD diameters present in the ensemble. According to ref ., such a spectrum is given by a shifted LN distribution similar to eq but with a new set of parameters: …”

Section: Resultsmentioning

confidence: 95%

“…In the following, we will reference the shifted log-normal distributions as corresponding to the optically excited dots. One should bare in mind that in these distributions, an account for the size dependence of the internal quantum efficiency (quantum yield) is also presumed , (see the Supporting Information for details. )…”

Section: Resultsmentioning

confidence: 99%

Quantum Confinement Explains Pump-Dependent Luminescence from Butyl-Terminated Si Quantum Dots

2019

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The origin of the luminescence of colloidal organically terminated silicon quantum dots is the topic of prime importance both from a fundamental point of view and in terms of various applications. In order to shed light on this topic, one should find out whether the basic principles of a particular theoretical approach are coherent with the experimental spectra and characteristics of real specimens with their inevitable imperfections. In this work, we develop a phenomenological semi-analytical method that matches (i) photoluminescence (PL) spectra of silicon colloidal quantum dots, (ii) size distribution of quantum dots, and (iii) excitation source characteristics. The method is based on the (i) log-normal size distribution of quantum dots, (ii) shifted log-normal distribution of optically excited dots, and (iii) influence of quantum confinement on emission and absorption. The formalism has been applied for the analysis of experimental PL spectra of butyl-terminated silicon quantum dots (reported in Dohnalová et al. Light: Sci. Appl. 2013, 2, e47), and it allowed quantitative description of experimentally observed phenomena such as (i) the blue shift of the PL peak position and its 2-fold widening with an increase of excitation photon energy and (ii) enhancement of the interval between the PL peak and excitation photon energy. The analysis has shown that the PL properties of butyl-terminated Si quantum dots are defined by core excitons while the surface effects play a minor role in contrast to the case of Si dots embedded into silica.

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High Internal Emission Efficiency of Silicon Nanoparticles Emitting in the Visible Range

Cited by 16 publications

References 58 publications

Direct measurement of quantum efficiency of single-photon emitters in hexagonal boron nitride

Direct measurement of quantum efficiency of single-photon emitters in hexagonal boron nitride

Classical antennas, quantum emitters, and densities of optical states

Quantum Confinement Explains Pump-Dependent Luminescence from Butyl-Terminated Si Quantum Dots

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