Title :
Microcavity light-emitting devices based on colloidal semiconductor nanocrystal quantum dots
Author :
Xu, Jian ; Cui, Dehu ; Lewis, Bradley A. ; Wang, Andrew Y. ; Xu, Shengyong ; Gerhold, Michael
Author_Institution :
Dept. of Eng. Sci. & Mech., Pennsylvania State Univ., State College, PA, USA
Abstract :
This letter describes the design, fabrication, and characterization of a microcavity-electroluminescence (EL) device based on colloidal semiconductor nanocrystal quantum dots (NQDs). The device was fabricated by sandwiching a solution-cast film of light-emitting CdSe-CdS core-shell NQDs between two metal mirrors to form a resonant microcavity structure. We have observed a significant reduction in EL emission bandwidth from the fabricated device. Further improvement of the emission efficiency of the NQD-microcavity-EL devices can be achieved upon the minimization of the losses that are pertinent to metal mirrors.
Keywords :
II-VI semiconductors; cadmium compounds; cavity resonators; colloids; electroluminescence; light emitting devices; micro-optics; microcavities; mirrors; nanostructured materials; semiconductor quantum dots; CdSe-CdS; CdSe-CdS quantum dots; colloidal quantum dots; core-shell quantum dots; device characterization; device design; device fabrication; electroluminescence device; electroluminescence emission bandwidth; light-emitting devices; loss minimization; metal mirrors; microcavity devices; nanocrystal quantum dots; resonant microcavity; semiconductor quantum dots; solution-cast film; Bandwidth; Crystalline materials; Electrons; Excitons; Light sources; Microcavities; Mirrors; Nanocrystals; Quantum dots; US Department of Transportation; Electroluminescent devices; light sources; nanotechnology; optoelectronic devices; quantum dots;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.856398
