DocumentCode :
3180
Title :
Enhanced Charge Transfer of QDs/Polymer Hybrid LED by Interface Controlling
Author :
Byoung-Ho Kang ; Sang-won Lee ; Sung-woo Lim ; Tae-Yang You ; Se-Hyuk Yeom ; Kyu-Jin Kim ; Dae-Hyuk Kwon ; Shin-Won Kang
Author_Institution :
Center for Functional Devices Fusion Platform, Kyungpook Nat. Univ., Daegu, South Korea
Volume :
34
Issue :
5
fYear :
2013
fDate :
May-13
Firstpage :
656
Lastpage :
658
Abstract :
We propose a quantum dots (QDs)/poly(N-vinylcarbazole) (PVK) hybrid light-emitting diode (LED) to improve the electron and hole confinement in the QDs layer. QDs used as monochromatic emitters are dispersed in a PVK matrix with a wide bandgap for quantum wells. The HOMO and LUMO level of the PVK can act as a hole transport buffer and an electron-blocking buffer in the hybridized layer. We fabricate an LED using a simplified QDs/PVK hybrid emissive layer (EML) and compare its performance with that of the hybrid LED with controlled QDs concentration. From the result, it is found that the 1.0 wt% QDs within the PVK hybrid LED show the best performance among the compared LEDs, with a luminance of 5989 cd/m2 and an efficiency of 4.2 cd/A. The efficient energy transfer and performance of the QDs/PVK hybrid EML are highly depended on the doping concentration of the QDs.
Keywords :
light emitting diodes; polymers; quantum dots; quantum well devices; EML; HOMO level; LUMO level; PVK matrix; QD-polymer hybrid LED; controlled QD concentration; doping concentration; electron confinement; electron-blocking buffer; enhanced charge transfer; hole confinement; hole transport buffer; hybrid emissive layer; hybrid light-emitting diode; interface controlling; monochromatic emitters; poly(N-vinylcarbazole); quantum dots; quantum wells; wide bandgap; Energy transfer; hybrid; light-emitting diode (LED); poly(N-vinylcarbazole) (PVK); quantum dots (QDs);
fLanguage :
English
Journal_Title :
Electron Device Letters, IEEE
Publisher :
ieee
ISSN :
0741-3106
Type :
jour
DOI :
10.1109/LED.2013.2252416
Filename :
6491439
Link To Document :
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