Increased Efficiency and Controlled Light Output from a Microstructured Light-Emitting Diode

Matterson, B.J.; Lupton, John M.; Safonov, Alexandr; Salt, Martin Guy; Barnes, William; Samuel, Ifor D. W.

doi:10.1002/1521-4095(200101)13:2<123::aid-adma123>3.0.co;2-d

Cited by 202 publications

(141 citation statements)

References 14 publications

(17 reference statements)

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“…By simulating and optically imaging this flow of light, new intuition is gained about the operation of optical antennas as compared with traditional far-field measurements of the angular distribution of the emission intensity. Our work also builds and expands on previous studies based on the use of metal gratings (without a central slit) to direct emission from quantum emitters [14][15][16] . Finally, the proposed antenna architecture allows for electrical manipulation of QD emission.…”

mentioning

confidence: 55%

Plasmonic beaming and active control over fluorescent emission

Jun

Huang²,

Brongersma³

2011

Nat Commun

194

185

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nanometallic optical antennas are rapidly gaining popularity in applications that require exquisite control over light concentration and emission processes. The search is on for highperformance antennas that offer facile integration on chips. Here we demonstrate a new, easily fabricated optical antenna design that achieves an unprecedented level of control over fluorescent emission by combining concepts from plasmonics, radiative decay engineering and optical beaming. The antenna consists of a nanoscale plasmonic cavity filled with quantum dots coupled to a miniature grating structure that can be engineered to produce one or more highly collimated beams. Electromagnetic simulations and confocal microscopy were used to visualize the beaming process. The metals defining the plasmonic cavity can be utilized to electrically control the emission intensity and wavelength. These findings facilitate the realization of a new class of active optical antennas for use in new optical sources and a wide range of nanoscale optical spectroscopy applications.

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mentioning

confidence: 55%

Plasmonic beaming and active control over fluorescent emission

Jun

Huang²,

Brongersma³

2011

Nat Commun

194

185

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show abstract

“…One method of enhancing the out-coupling efficiency is to use a high-refractiveindex glass substrate and a hemisphere microlens thereon [16][17][18] . Moreover, a Bragg diffraction grating (BDG), a low-index grid and an internal scattering structure of the organic layer have been introduced in these devices for the light extraction of the indium tin oxide (ITO)/organic WG mode [19][20][21][22][23][24] . However, BDGs fabricated using the electron-beam lithography 19 , nanoimprinting 20 and holographic methods [21][22][23] incur the high costs and require complex techniques.…”

mentioning

confidence: 99%

“…Moreover, a Bragg diffraction grating (BDG), a low-index grid and an internal scattering structure of the organic layer have been introduced in these devices for the light extraction of the indium tin oxide (ITO)/organic WG mode [19][20][21][22][23][24] . However, BDGs fabricated using the electron-beam lithography 19 , nanoimprinting 20 and holographic methods [21][22][23] incur the high costs and require complex techniques. In addition, it is difficult to extract at broad range of light emission using BDGs with regular periodic structures for white OLEDs because such a BDG extracts specific emission wavelengths in accordance with Bragg's law, depending on the specific grating period and angle.…”

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confidence: 99%

Highly efficient inverted polymer light-emitting diodes using surface modifications of ZnO layer

et al. 2014

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Organic light-emitting diodes have been recently focused for flexible display and solid-state lighting applications and so much effort has been devoted to achieve highly efficient organic light-emitting diodes. Here, we improve the efficiency of inverted polymer light-emitting diodes by introducing a spontaneously formed ripple-shaped nanostructure of ZnO and applying an amine-based polar solvent treatment to the nanostructure of ZnO. The nanostructure of the ZnO layer improves the extraction of the waveguide modes inside the device structure, and a 2-ME þ EA interlayer enhances the electron injection and hole blocking in addition to reducing exciton quenching between the polar-solvent-treated ZnO and the emissive layer. Therefore, our optimized inverted polymer light-emitting diodes have a luminous efficiency of 61.6 cd A À 1 and an external quantum efficiency of 17.8%, which are the highest efficiency values among polymer-based fluorescent light-emitting diodes that contain a single emissive layer.

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“…The interaction of modes guided in a substrate with a grating leads to a directional leakage of emission with 0 . [30][31][32] The grating diffraction in transmission was measured in LB films under the condition + ␣ = 76°͓Fig. 5͑d͔͒.…”

Section: Discussionmentioning

confidence: 99%

Modification of emission of CdTe nanocrystals by the local field of Langmuir–Blodgett colloidal photonic crystals

Romanov¹,

Bardosova

Povey

et al. 2008

Journal of Applied Physics

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A light source on the surface of a slab of 2+1-dimensional photonic crystal has been prepared by the Langmuir–Blodgett deposition of a colloidal crystal on top of a thin film containing CdTe nanocrystals. The directional enhancement of the light emission intensity in the spectral range of the photonic bandgap has been revealed through the comparative examination of the angle-resolved transmission, diffraction, and photoluminescence spectra of the prepared structures. Changes in the emission spectrum have been tentatively explained in terms of the acceleration of the radiative recombination due to the increase in the local field strength at photonic bandgap resonance and changes in the emission diagram—as arising from the wavelength dependence of the topology of the local field pattern.

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Increased Efficiency and Controlled Light Output from a Microstructured Light-Emitting Diode

Cited by 202 publications

References 14 publications

Plasmonic beaming and active control over fluorescent emission

Plasmonic beaming and active control over fluorescent emission

Highly efficient inverted polymer light-emitting diodes using surface modifications of ZnO layer

Modification of emission of CdTe nanocrystals by the local field of Langmuir–Blodgett colloidal photonic crystals

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