Fluorescence lifetimes of molecular dye ensembles near interfaces

Danz, Norbert; Heber, Jörg; Bräuer, Andreas; Kowarschik, R.

doi:10.1103/physreva.66.063809

Cited by 27 publications

(24 citation statements)

References 38 publications

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“…This theoretical approach yields the electromagnetic field in each layer. The far field in substrate or cladding is calculated asymptotically by saddle-point integration [5,7] to describe measured radiation patterns. Due to the large bandwidth of emission, dispersion of every material has been measured separately by means of guided mode spectroscopy.…”

Section: Device Design and Fabricationmentioning

confidence: 99%

Micro-cavity organic light emitting diodes for biochip applications

Michelotti

Roma

Belardini

et al. 2006

Journal of Non-Crystalline Solids

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Section: Device Design and Fabricationmentioning

confidence: 99%

Micro-cavity organic light emitting diodes for biochip applications

Michelotti

Roma

Belardini

et al. 2006

Journal of Non-Crystalline Solids

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“…Examples of such systems are many different kinds of photonic materials, including metallic and dielectric mirrors, [5][6][7][8][9] cavities, 10 metallic films, 11,12 and two-, 13,14 and three-dimensional 15 photonic crystals. Figure 1 shows how observable parameters are related to the decay of an excited state X * to the ground state X.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of time-resolved emission from ensembles of semiconductor quantum dots: Interpretation of exponential decay models

et al. 2007

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We present a statistical analysis of time-resolved spontaneous emission decay curves from ensembles of emitters, such as semiconductor quantum dots, with the aim of interpreting ubiquitous non-single-exponential decay. Contrary to what is widely assumed, the density of excited emitters and the intensity in an emission decay curve are not proportional, but the density is a time integral of the intensity. The integral relation is crucial to correctly interpret non-single-exponential decay. We derive the proper normalization for both a discrete and a continuous distribution of rates, where every decay component is multiplied by its radiative decay rate. A central result of our paper is the derivation of the emission decay curve when both radiative and nonradiative decays are independently distributed. In this case, the well-known emission quantum efficiency can no longer be expressed by a single number, but is also distributed. We derive a practical description of non-single-exponential emission decay curves in terms of a single distribution of decay rates; the resulting distribution is identified as the distribution of total decay rates weighted with the radiative rates. We apply our analysis to recent examples of colloidal quantum dot emission in suspensions and in photonic crystals, and we find that this important class of emitters is well described by a log-normal distribution of decay rates with a narrow and a broad distribution, respectively. Finally, we briefly discuss the Kohlrausch stretched-exponential model, and find that its normalization is ill defined for emitters with a realistic quantum efficiency of less than 100%.

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“…We follow a slightly different description based on the well known Green's functions approach [5,16] originally adapted to simulate lifetime changes of emitters within planar geometries [17,18]. These classical electrodynamic approaches model the emitter by an oscillating electrical dipole, i.e., the molecular transition is assumed to appear from/to singlet electronic states.…”

Section: Theoretical Descriptionmentioning

confidence: 99%

OLED design: combined micro-and nanophotonics modeling, and routes to a complex optimization algorithm

2007

Self Cite

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The efficiency of organic light emitting diodes is known to be optically limited by different light trapping effects within the device structure. Several approaches have been suggested to enhance the transfer of radiation generated within the device into free space radiation. These approaches include nanoscale wave optical effects to optimize the stratified active media or to diffract guided modes travelling within the active system, as well as refractive or scattering elements to derange total internal reflection within the substrate. This paper deals with substrate emitting devices, where nano-or microscale structures enforce a "recycling" of light that originally would have been trapped within the system. An approach enabling for a combined treatment of ray-optical and thin-film-optimization is introduced and applied to the optimization of an example system. The results indicate an improved system design due to that complex optimization.

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Fluorescence lifetimes of molecular dye ensembles near interfaces

Cited by 27 publications

References 38 publications

Micro-cavity organic light emitting diodes for biochip applications

Micro-cavity organic light emitting diodes for biochip applications

Statistical analysis of time-resolved emission from ensembles of semiconductor quantum dots: Interpretation of exponential decay models

OLED design: combined micro-and nanophotonics modeling, and routes to a complex optimization algorithm

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