Light extraction from optically pumped light-emitting diode by thin-slab photonic crystals

High Extraction Efficiency of Spontaneous Emission from Slabs of Photonic Crystals

A thin slab of two-dimensional photonic crystal is shown to alter drastically the radiation pattern of spontaneous emission. More specifically, by eliminating all guided modes at the transition frequencies, spontaneous emission can be coupled entirely to free space modes, resulting in a greatly enhanced extraction efficiency. Such structures might provide a solution to the long-standing problem...

Spontaneous Emission Extraction and Purcell Enhancement from Thin-Film 2-D Photonic Crystals

Electromagnetic band structure can produce either an enhancement or a suppression of spontaneous emission from two-dimensional (2-D) photonic crystal thin films. We believe that such effects might be important for light emitting diodes. Our experiments were based on thin-film InGaAs/InP 2-D photonic crystals at ambient temperature, but the concepts would apply equally to InGaN thin films, for e...

Coupled optical and electronic simulations of electrically pumped photonic-crystal-based light-emitting diodes

We use coupled optical and electronic simulations to investigate design trade-offs in electrically pumped photonic-crystal-based light-emitting diodes. A finite-difference frequency-domain electromagnetic solver is used to calculate the spontaneous emission enhancement factor and the extraction efficiency as a function of frequency and of position of the emitting source. The calculated enhancem...

DOCTEUR DE L'ECOLE POLYTECHNIQUE Aurélien DAVID High-efficiency GaN-based light-emitting diodes: Light extraction by photonic crystals and microcavities

Design and Modeling for Enhancement of Light Extraction in Light-emitting Diodes with Archimedean Lattice Photonic Crystals

Light extraction efficiency of light-emitting diodes (LEDs) based on various photonic crystal (PhC) structures is investigated in this study. By using the plane wave method and the finite element method, the influence of several factors on the enhancement of light extraction is discussed, including lattice type, the density of states from a photonic band diagram, the ratio of cylinder radius an...