title: Quantum dot light-emitting devices with electroluminescence tunable over the entire visible spectrum.
abstract: Improvements in quantum dot light-emitting device (QD-LED) performance are achieved by the choice of organic charge transporting layers, by use of different colloidal QDs for the different parts of the visible spectrum, and by utilizing a recently demonstrated robust QD deposition method. Spectrally narrow electroluminescence of our QD-LEDs is tuned over the entire visible wavelength range from lambda = 460 nm (blue) to lambda = 650 nm (deep red). By printing close-packed monolayers of different QD types inside an identical QD-LED structure, we demonstrate that different color QD-LEDs with QDs of different chemistry can be fabricated on the same substrate. We discuss mechanisms responsible for efficiency increase for green (4-fold) and orange (30%) QD-LEDs as compared to previous reports and outline challenges associated with achieving high-efficiency blue QD-LEDs.
authors.affiliation: Laboratory of Organic Optics and Electronics, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge Massachusetts 02139, USA.
authors.forename: Polina O
authors.initials: PO
authors.lastname: Anikeeva
authors.forename: Jonathan E
authors.initials: JE
authors.lastname: Halpert
authors.forename: Moungi G
authors.initials: MG
authors.lastname: Bawendi
authors.forename: Vladimir
authors.initials: V
authors.lastname: Bulović
mesh_terms: D002104:Cadmium / Q000737:chemistry; D004563:Electrochemistry; D008027:Light; D008163:Luminescent Measurements / Q000295:instrumentation; D018625:Microscopy, Atomic Force; D045663:Quantum Dots; D012643:Selenium / Q000737:chemistry; D013455:Sulfur / Q000737:chemistry; D013499:Surface Properties; D015032:Zinc / Q000737:chemistry
chemical_list: D002104:Cadmium; D013455:Sulfur; D012643:Selenium; D015032:Zinc