Microcavity enhanced vertical-cavity light-emitting diodes

Abstract

We systematically studied microcavity enhancement and mode-coupling effects in photo- and electroluminescence of an AlGaAs/GaAs vertical-cavity light-emitting diode (LED) by continuously changing the microcavity resonance with respect to the quantum well band gap. At mode overlap we obtained maximum photo- and electroluminescence intensities and a minimum emitted linewidth of 4.6 nm at 836 nm with a FWHM divergence of 62°. However, the electrical-to-optical efficiency was less than 1 μW/mA. Application issues for optical interconnects are presented.

<title>Planar substrate-emitting-microcavity light-emitting diodes with 20% external QE</title>

“…Microcavities have already shown large external QE's and directional light emission useful for fiberoptic applications. [2][3][4][5][6] We optimized the layer structure of a substrate emitting microcavity LED and found that the light extraction efficiency of a microcavity layer structure surrounded by air can be 30%. If this layer structure would be encapsulated by an epoxy, the light extraction efficiency might even exceed 50%.…”

<title>Planar substrate-emitting-microcavity light-emitting diodes with 20% external QE</title>

“…Microcavities have already shown large external QE's and directional light emission useful for fiberoptic applications. [2][3][4][5][6] We optimized the layer structure of a substrate emitting microcavity LED and found that the light extraction efficiency of a microcavity layer structure surrounded by air can be 30%. If this layer structure would be encapsulated by an epoxy, the light extraction efficiency might even exceed 50%.…”

<title>Planar substrate-emitting-microcavity light-emitting diodes with 20% external QE</title>

“…Microcavities have already shown large external QE's and directional light emission useful for fiberoptic applications. [2][3][4][5][6] We optimized the layer structure of a substrate emitting microcavity LED and found that the light extraction efficiency of a microcavity layer structure surrounded by air can be 30%. If this layer structure would be encapsulated by an epoxy, the light extraction efficiency might even exceed 50%.…”

<title>Planar substrate-emitting-microcavity light-emitting diodes with 20% external QE</title>

“…Microcavities have already shown large external QE's and directional light emission useful for fiberoptic applications. [2][3][4][5][6] We optimized the layer structure of a substrate emitting microcavity LED and found that the light extraction efficiency of a microcavity layer structure surrounded by air can be 30%. If this layer structure would be encapsulated by an epoxy, the light extraction efficiency might even exceed 50%.…”