Directional light extraction from thin-film resonant cavity light-emitting diodes with a photonic crystal

Bergenek, K.; Wiesmann, Christopher; Zull, H.; Wirth, R.; Sundgren, P.; Linder, N.; Streubel, K.; Krauss, Thomas F.

doi:10.1063/1.3046130

Cited by 25 publications

(16 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, microcavities only a few wavelengths thick could also be a solution as they only support a few guided modes and some of these modes can be chosen to have optimum properties for diffraction by adjusting the overall thickness and the position of the active layer inside the LED. In the case of AlGaInP-based PhC RCLEDs enhancement factors compared to a flat reference of 2.6 are possible [22]. For the GaAs material system the extraction efficiency of a RCLED with a metallic grating has been calculated as 43% [6].…”

Section: D Part: Vertical Layer Stack and Etch Depthmentioning

confidence: 99%

Photonic crystal LEDs – designing light extraction

Wiesmann

Bergenek

Linder

et al. 2009

Laser & Photonics Reviews

Self Cite

244

192

View full text Add to dashboard Cite

Photonic crystals (PhCs) have attracted much attention during the last decade as a solution to overcome the low extraction efficiency of as-grown light-emitting diodes (LEDs). In this review we describe the underlying physics and summarize recent results obtained with PhC LEDs. Here, the main focus is on diffracting PhC. In order to quantify the benefit from the incorporation of PhCs for diffracting light a comparison by simulations between a PhC LED and a standard state-of-theart LED is carried out. Finally, the impact of the PhC on the LEDs emission characteristics will be discussed with respect tó etendue-limited applications.Azimuthal emission pattern of an InGaN/GaN LED with hexagonal PhC at a single wavelength. Background: SEM (scanning electron microscope) image of the PhC structure.

show abstract

Section: D Part: Vertical Layer Stack and Etch Depthmentioning

confidence: 99%

Photonic crystal LEDs – designing light extraction

Wiesmann

Bergenek

Linder

et al. 2009

Laser & Photonics Reviews

Self Cite

244

192

View full text Add to dashboard Cite

show abstract

“…1 Approaches based on the photonic crystal ͑PhC͒ have attracted much attention to achieve light extraction enhancement, polarization, and directional patterns from GaN LEDs. [2][3][4] Recently, an AlGaInP filmtransferred ͑FT͒ resonant cavity LED combined with PhC has been reported for enhancing directional light extraction 5 in the red wavelength, as well as GaN PhC FTLEDs in the blue wavelength range for light extraction enhancement. 6,7 Nevertheless, a blue GaN PhC FTLEDs with directional light extraction has not been studied in detail.…”

Section: Directional Light Extraction Enhancement From Gan-based Filmmentioning

confidence: 99%

Directional light extraction enhancement from GaN-based film-transferred photonic crystal light-emitting diodes

Lai

Chao

Kuo

et al. 2009

Applied Physics Letters

View full text Add to dashboard Cite

Articles you may be interested inHighly-directional emission patterns based on near single guided mode extraction from GaN-based ultrathin microcavity light-emitting diodes with photonic crystals Appl. Phys. Lett. 97, 013108 (2010); 10.1063/1.3459970 Enhancement of light extraction from GaN-based green light-emitting diodes using selective area photonic crystal Appl. Phys. Lett. 96, 251103 (2010); 10.1063/1.3454240 Measurement of extraction and absorption parameters in GaN-based photonic-crystal light-emitting diodes

show abstract

“…Similarly, the wavevectors of radiation transmitted from the medium with low refractive index will be confined to this cone in the medium of high refractive index. Then one can express, T H L as [10] where φ H denotes the azimuthal angle. The factor, cos θ H in Eq.…”

Section: Transmittance Through a Flat Surfacementioning

confidence: 99%

The Limits of Transmittance of an Interface and Their Effects on Light Extraction

Mishra

Piquette

2017

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

We have investigated the upper limit for transmittance of electromagnetic radiation through an interface between two materials of differing refractive indexes. This limit was previously established using thermodynamic arguments [A. Lenef, J. F. Kelso, and A. Piquette, Opt. Lett., 39, 3058 (2014)]. We show that this limit is absolute and can also be derived independently from classical electromagnetic theory. The maximum enhancement of transmittance through an interface is shown to be ∼4% compared to that of a perfectly flat surface for a Lambertian distribution of light. Using a semi-infinite slab enclosed by two surfaces, one of which is a mirror, we show how relatively unimportant the enhancement of the single-interface transmittance could be compared to other cavity-related effects for extracting a photon. Neither a planar reflecting surface nor a roughened surface could alone significantly improve the extraction efficiency. However, higher extraction efficiency could be achieved through a combination of reflection and roughened faces which allows a photon to escape ultimately because of multiple reflections and scattering. It is shown through numerical simulation using geometrical optics that the reflectance of the mirror and the absorption of the bulk material could be significantly more important than the surface transmittance in this case.

show abstract

Directional light extraction from thin-film resonant cavity light-emitting diodes with a photonic crystal

Cited by 25 publications

References 20 publications

Photonic crystal LEDs – designing light extraction

Photonic crystal LEDs – designing light extraction

Directional light extraction enhancement from GaN-based film-transferred photonic crystal light-emitting diodes

The Limits of Transmittance of an Interface and Their Effects on Light Extraction

Contact Info

Product

Resources

About