Solution-Processed White Light-Emitting Diode Utilizing Hybrid Polymer and Red-Green-Blue Quantum Dots

Title
Solution-Processed White Light-Emitting Diode Utilizing Hybrid Polymer and Red-Green-Blue Quantum Dots
Authors
권병욱손동익박동희최헌진최원국
Keywords
whiter lighting LED; QD-hybrid polymer; Electroluminescene; low workfunction
Issue Date
2012-10
Publisher
Japanese journal of applied physics
Citation
VOL 51, NO 9, 09MH03-1-09MH03-4
Abstract
A hybrid polymer-quantum dots (QDs) white light-emitting diode (WLEDs) device with a multi-layer structure by all solution processing is simply fabricated by using a spin coating technique. From transmission electron microscopy (TEM) study, red–green–blue (RGB) CdSe/ZnS QDs are mainly distributed along with the circumference of poly(N-vinylcarbazole) (PVK) surfaces, resulting in core–shell hybrid polymer-QDs of [RGB CdSe/ZnS QDs]/PVK. The Al/Cs2CO3/[RGB CdSe/ZnS QDs+PVK]/poly[(N,N0-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine)] (poly-TPD)/ poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/indium–tin-oxide (ITO)/glass WLEDs shows electroluminescence (EL) centered at around 474, 544, and 629nm with CIE coordinates, ð0:44; 0:32Þ at the forward bias +11 V, which clearly reveals that CdSe/ZnS QDs existing at the interface between PVK plays as a recombination center of exciton.
URI
http://pubs.kist.re.kr/handle/201004/43153
ISSN
00214922
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