Electroluminescence from a mixed red-green-blue colloidal quantum dot monolayer

TitleElectroluminescence from a mixed red-green-blue colloidal quantum dot monolayer
Publication TypeJournal Article
Year of Publication2007
AuthorsAnikeeva, PO, Halpert, JE, Bawendi, MG, Bulovic, V
JournalNano Letters
Volume7
Issue8
Pagination2196 - 2200
Date Published2007/08//
Abstract

We demonstrate light emitting devices (LEDs) with a broad spectral emission generated by electroluminescence from a mixed-monolayer of red, green, and blue emitting colloidal quantum dots (QDs) in a hybrid organic/inorganic structure. The colloidal QDs are reproducibly synthesized and yield high luminescence efficiency materials suitable for LED applications. Independent processing of the organic charge transport layers and the QD luminescent layer allows for precise tuning of the emission spectrum without changing the device structure, simply by changing the ratio of different color QDs in the active layer. Spectral tuning is demonstrated through fabrication of white QD-LEDs that exhibit external quantum efficiencies of 0.36% (Commission Internationale de I'Eclairage) coordinates of (0.35, 0.41) at video brightness, and color rendering index of 86 as compared to a 5500 K blackbody reference.