Emission characteristics of photonic crystal light-emitting diodes

Khokhar, Ali Z.; Parsons, Keith; Hubbard, Graham; Watson, I. M.; Rahman, Faiz; Macintyre, D.; Xiong, Chao; Massoubre, David; Gong, Zheng; Gu, Erdan; Johnson, Nigel P.; Rue, R.M. De La; Dawson, Martin D.; Abbott, Steven; Charlton, Martin D. B.; Tillin, Martin

doi:10.1364/ao.50.003233

Cited by 9 publications

(6 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, this is also a good fit for low cost optical lithography, so most nanoimprint lithography work has been on improving the performance of LEDs through the incorporation of nanoscale patterning. For example, many groups have demonstrated the integration of photonic crystals on top of LEDs by nanoimprint lithography, improving light output by as much as 25 % [10,44,45]. To limit etching damage, Truong et al directly imprinted titanium oxide photonic crystals using sol gel titania as an imprint resist with a soft poly[(3-mercaptopropyl) methylsiloxane] (PMMS) mold specifically designed to allow solvent diffusion through the mold during the curing process [46].…”

Section: Optical Devicesmentioning

confidence: 99%

Nanoimprint lithography for nanodevice fabrication

Barcelo¹,

Li²

2017

Nano Online

View full text Add to dashboard Cite

Nanoimprint lithography (NIL) is a compelling technique for low cost nanoscale device fabrication. The precise and repeatable replication of nanoscale patterns from a single high resolution patterning step makes the NIL technique much more versatile than other expensive techniques such as e-beam or even helium ion beam lithography. Furthermore, the use of mechanical deformation during the NIL process enables grayscale lithography with only a single patterning step, not achievable with any other conventional lithography techniques. These strengths enable the fabrication of unique nanoscale devices by NIL for a variety of applications including optics, plasmonics and even biotechnology. Recent advances in throughput and yield in NIL processes demonstrate the potential of being adopted for mainstream semiconductor device fabrication as well.

show abstract

Section: Optical Devicesmentioning

confidence: 99%

Nanoimprint lithography for nanodevice fabrication

Barcelo¹,

Li²

2017

Nano Online

View full text Add to dashboard Cite

show abstract

“…The enhancement of the extraction efficiency in LEDs by surface patterning requires an optimized design leading to the photonic crystal (PhC) structures that optimize the interaction of the guided modes with the photonic band gap (PBG) of PhCs. It was achieved by different patterning techniques in original papers [3][4][5][6][7][8][9][10][11][12][13]. For maximum extraction efficiency, there must be a strong coupling between the trapped waveguide modes and PhC structure.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the choice of two-dimensional (2D) PhC geometry plays important role in determining the far-field radiation pattern of the LED [12,13]. From the point of PhC shape and geometry, the wide variety of PhC and photonic quasicrystals were investigated.…”

Section: Introductionmentioning

confidence: 99%

Complex Analysis of Emission Properties of LEDs with 1D and 2D PhC Patterned by EBL

et al. 2020

View full text Add to dashboard Cite

In this paper, we present the optical and electrical properties of surface-patterned GaAs-based Multiquantum Well (MQW) light emitting diodes (LEDs) with one- and two-dimensional photonic crystal (PhC) structures. Optical properties were analyzed in the near and far field, measured by a near-field scanning optical microscope and with a goniophotometer. We demonstrated a strong effect of patterned PhC on the radiation properties and the light extraction efficiency. Enormous surface emission enhancement reaching 110% confirmed the strong effect of the patterned structure on the coupling of the guided modes into the surface emission. Additionally, the considerable effect of the PhC structure diffraction on radiation pattern was confirmed in the near and far field and is in good agreement with the simulated shape of the optical field.

show abstract

“…These properties have been used for a variety of applications including polarizers, filters [8], biosensors [9], optical communication components [10], displays, and lighting [11]. PCs have been incorporated into light emitting diodes (LEDs) in order to increase extraction efficiency [12], and to control the directionality of light output, either normal to the device or into angular sidelobes [13,14].…”

Section: Introductionmentioning

confidence: 99%

Region specific enhancement of quantum dot emission using interleaved two-dimensional photonic crystals

See

Naughton

et al. 2015

Appl. Opt.

View full text Add to dashboard Cite

The power efficiency, spectral characteristics, and output directionality of light emitting diodes (LEDs) used for lighting and video display may be tailored by integrating nanostructures that interact with photon emitters. In this work, we demonstrate an approach in which visible-wavelength-emitting quantum dots (QDs) are integrated within a polymer-based photonic crystal (PC) and excited by an ultraviolet-emitting LED. The PC design incorporates two interleaved regions, each with distinct periods in orthogonal directions. The structure enables simultaneous resonant coupling of ultraviolet excitation photons to the QDs and visible QD emission at two different wavelengths to efficiently extract photons normal to the PC surface. The combined excitation and extraction enhancements result in a 5.8X increase in the QD output intensity. Further, we demonstrate multiple QD-doped PCs combined on a single surface to optimally couple with distinct populations of QDs, offering a means for blending color output and directionality of multiple wavelengths. Devices are fabricated upon flexible plastic surfaces by a manufacturable replica molding approach.

show abstract

Emission characteristics of photonic crystal light-emitting diodes

Cited by 9 publications

References 28 publications

Nanoimprint lithography for nanodevice fabrication

Nanoimprint lithography for nanodevice fabrication

Complex Analysis of Emission Properties of LEDs with 1D and 2D PhC Patterned by EBL

Region specific enhancement of quantum dot emission using interleaved two-dimensional photonic crystals

Contact Info

Product

Resources

About