Enhanced spontaneous emission in a photonic crystal light-emitting diode
M. Francardi, L. Balet, A. Gerardino, N. Chauvin, D. Bitauld, L.H. Li,, B. Alloing, and A. Fiore
TL;DR
This paper demonstrates enhanced spontaneous emission in a photonic crystal LED with quantum dots, showing faster emission rates and a well-defined emission peak, indicating improved light-emitting efficiency.
Contribution
The study provides direct experimental evidence of spontaneous emission enhancement in a photonic crystal LED with quantum dots, using time-resolved electroluminescence.
Findings
Enhanced emission rate observed at 1300nm
Faster switching times than bulk lifetimes
Clear emission peak from PhC cavity mode
Abstract
We report direct evidence of enhanced spontaneous emission in a photonic crystal (PhC) light-emitting diode. The device consists of p-i-n heterojunction embedded in a suspended membrane, comprising a layer of self-assembled quantum dots. Current is injected laterally from the periphery to the center of the PhC. A well-isolated emission peak at 1300nm from the PhC cavity mode is observed, and the enhancement of the spontaneous emission rate is clearly evidenced by time-resolved electroluminescence measurements, showing that our diode switches off in a time shorter than the bulk radiative and nonradiative lifetimes
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