|Title||Quantum Dot Light-Emitting Devices with Electroluminescence Tunable over the Entire Visible Spectrum|
|Publication Type||Journal Article|
|Year of Publication||2009|
|Authors||Anikeeva, PO, Halpert, JE, Bawendi, MG, Bulovic, V|
|Pagination||2532 - 2536|
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 650 nm (deep red). By printing close-packed monolayers of different OD types inside an identical OD-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.