Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 22, Pages 12011-12016Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4038068
Keywords
light-emitting diodes; shell thickness; quantum dot; electroluminescence; core-shell
Funding
- National Natural Science Foundation of China [21071041, 21201055]
- Program for Changjiang Scholars and Innovative Research Team in University [PCS IRT1126]
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In this paper, we use a simple device architecture based on solution-processed ZnO nanoparticles (NPs) as the electron injection/transport layer and bilayer structure of poly(ethylenedioxythiophene) :polystyrene sulfonate (PEDOT:PSS)/poly[9,9-dioctylfluorene-co-N44-(3-methylpropyl)]-diphenylamine] (TFB) as the hole injection/transport layer to assess the effect of shell thickness on the properties of quantum-dot-based light emitting diodes (QD-LEDs), comprising CdSe/CdS/ZnS core-shell QDs as the emitting layer. QDs with varying shell thickness were assessed to determine the best option of shell thickness, and the best improvement in device performance was observed when the shell thickness was 2.1 nm. Thereafter, different emissions of QDs, but with optimized same shell thickness (,2.1 nm), were selected as emitters to be fabricated into same structured QD-LEDs. Highly bright orange-red and green QD-LEDs with peak luminances up to --,30 000 and -,52 000 cd I11-2, and power Im respectively, were demonstrated successfully. These results may demonstrate a striking commercialization of QD-based displays and solid-state lightings. efficiencies of 16 and 19.7 basic prototype for the
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