In this work, a simple method to prepare white light emissive diodes based on quantum dot (QD) colloidal solutions using mixed carbon QDs (CQDs) and CsPbI3 perovskite (PQDs) is reported. The right combination generates emission across the entire visible spectrum upon ultraviolet excitation. The white light emission of the final films provides high and stable color rendering index of 92%, tuning the chromaticity coordinates of the emission through the applied voltage. By varying the CsPbI3 QD concentration, a mixture is obtained that emits the “warm”, “neutral”, and “cold” white light sought for many indoor lighting applications, or to approximate the visible region of the solar spectrum, respectively. Remarkably, the material syntheses are low cost and truly scalable. In addition, colloidal mixtures of CQDs and CsPbI3 PQDs show a facile deposition for light‐emitting diode (LED) application, showing white electroluminescence, indicating that both kinds of QDs are stable during LED operation. Last but not least, the photoluminescence quantum yield of the colloidal mixtures is higher (up to 75%) than single white emitters, showing itself as a promising system for white emission with tunable properties.
We
describe the use of carbon dots (C-Dots) as selective contacts
for electronic holes in inverted hybrid light-emitting diodes. Moreover,
we have studied the effect of the C-Dots’ amine-derivative
surface ligands and their impact on the device performance. The different
surface ligands affect not only the optical properties of the C-Dots
but also the device turn-on voltage and the luminance parameters despite
not forming part of the emissive layer. For instance, the C-Dots capped
with the aromatic ring p-phenylenediamine show unfavorable
effects, whereas the effect of nonaromatic capping ligands depends
upon the length of their molecular backbone.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.