Physics > Applied Physics
[Submitted on 26 Sep 2022 (v1), last revised 15 Nov 2022 (this version, v3)]
Title:Origin of the injection-dependent emission blueshift and linewidth broadening of III-nitride light-emitting diodes
View PDFAbstract:III-nitride light-emitting diodes (LEDs) exhibit an injection-dependent emission blueshift and linewidth broadening that is severely detrimental to their color purity. Using first-principles multi-scale modelling that accurately captures the competition between polarization-charge screening, phase-space filling, and many-body plasma renormalization, we explain the current-dependent spectral characteristics of polar III-nitride LEDs fabricated with state-of-the-art quantum wells. Our analysis uncovers a fundamental connection between carrier dynamics and the injection-dependent spectral characteristics of light-emitting materials. For example, polar III-nitride LEDs offer poor control over their injection-dependent color purity due to their poor hole transport and slow carrier recombination dynamics, which forces them to operate at or near degenerate carrier densities. Designs that accelerate carrier recombination and transport and reduce the carrier density required to operate LEDs at a given current density lessen their injection-dependent wavelength shift and linewidth broadening.
Submission history
From: Nick Pant [view email][v1] Mon, 26 Sep 2022 15:06:28 UTC (1,479 KB)
[v2] Sun, 9 Oct 2022 09:51:05 UTC (1,164 KB)
[v3] Tue, 15 Nov 2022 16:41:52 UTC (1,565 KB)
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