Quantum dot light-emitting devices with electroluminescence tunable over the entire visible spectrum.
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.
Anikeeva
Polina O
PO
Laboratory of Organic Optics and Electronics, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge Massachusetts 02139, USA.
Halpert
Jonathan E
JE
Bawendi
Moungi G
MG
Bulović
Vladimir
V
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
D002104:Cadmium; D013455:Sulfur; D012643:Selenium; D015032:Zinc