Research briefing — 15 October 2026. A peer-reviewed study in Nature, published 14 October, reports that a common additive used to make perovskite light-emitting diodes changes chemically during solution preparation. By isolating its beneficial reaction product, researchers demonstrated near-infrared LEDs with 37.1% champion external quantum efficiency (EQE).
What changed?
5-aminovaleric acid (5AVA) can form two chemically distinct products: a helpful organoamidinium zwitterion and an unfavorable lactam. The researchers synthesized the useful species directly, separating its defect-passivation role from the unwanted reaction product. This makes the chemistry behind improved films clearer and potentially more reproducible.
Measured performance
The films reached 97.2% mean peak photoluminescence quantum yield. The best near-infrared LED achieved 37.1% peak external quantum efficiency (EQE), while the mean peak EQE was 32.8%. Photoluminescence yield measures light emitted following optical excitation. EQE relates emitted photons to injected charge. Neither metric alone establishes operating lifetime or total electrical power efficiency.
Why the chemistry matters
The study shows why precursor additives should not always be treated as chemically unchanged ingredients. Reaction products can affect crystal formation and electronic defects in the final semiconductor. Identifying the useful molecule, rather than adjusting an uncontrolled mixture, could make fabrication more reproducible. The authors also examined related additive chemistries and other emission colours, indicating possible broader relevance.
Potential applications
Near-infrared LEDs could eventually support optical sensing, spectroscopy, imaging and short-range optical communication. Other perovskite emitters are being investigated for display technology. These are prospective applications of the broader material family, not products validated by this particular study.
Development stage
The work remains a laboratory demonstration. Commercial devices would need proven operating lifetime, stability under heat and moisture, repeatable large-area manufacturing and suitable encapsulation. Peak EQE alone cannot establish commercial readiness.
Primary research
Baek and colleagues, “Hidden reaction pathways inform additive engineering for perovskite LEDs,” Nature, 14 October 2026. Original peer-reviewed article (DOI).
Element Folio research briefing. Laboratory metrics are not commercial product specifications.
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