P‐59: The Linewidth Gaps for Quantum Dots and Micro LEDs

Abstract

The emission linewidth of light emitters such as quantum dots and µLEDs significantly affect their performance in displays, but the gaps between experimental data and the fundamental limits have not been clearly quantified. Here, a survey of experimental data and simple theoretical models are used to delineate large linewidth gaps for both QDs and µLEDs for visible wavelengths. For CdSe QDs the linewidth gap is ~1.5‐3 times the fundamental limit. For InP QDs the linewidth gap is ~2‐4 times the fundamental limit. For GaN‐based µLEDs the gap is ~1.5‐3 times the fundamental linewidth limit. It is also shown that both state‐of‐the‐art OLEDs and GaN LEDs have similar linewidths over the visible wavelength range. Moreover, it is found that one of the value propositions of using inorganic GaN µLEDs (better color gamut) is yet to be demonstrated, and QDs as color conversion for red and green will likely prove beneficial until the “ideal state” of GaN based µLEDs can be proven/solved.