High-efficiency blue and white electroluminescent devices based on non-Cd I-III-VI quantum dots

Title
High-efficiency blue and white electroluminescent devices based on non-Cd I-III-VI quantum dots
Authors
황준연홍승기윤석영김종훈김경혜한창열조정호조대연도영락양희선
Keywords
QLED; quantum dot; non Cd QD
Issue Date
2019-09
Publisher
Nano energy
Citation
VOL 63-103869-7
Abstract
Research direction of colloidal quantum dot (QD)-based LEDs (QLEDs), whose performance has substantially progressed over last two decades, has been oriented mostly to the fabrication of next-generation, high-color gamut display devices particularly based on Cd-containing QDs, while their extension to solid-state planar lighting application remains nearly unexplored. In this work, we report on all-solution-processed fabrication of group I– III– VI chalcogenide, non-Cd QDs-based high-efficiency white lighting electroluminescent (EL) devices. For this, using Zn– Cu– Ga– S (ZCGS) QD emitters having a high photoluminescence quantum yield (PL QY) of 80% a multilayered blue QLED consisting of poly(9-vinylcarbazole) hole transport layer (HTL) and Mg-alloyed ZnO nanoparticle electron transport layer (ETL) is first fabricated, showing a maximum external quantum efficiency (EQE) of 7.1%. Then, white QLEDs containing a mixture of blue ZCGS and yellow Cu– In– S QDs as a single emitting layer (EML) are constructed with the same HTL/ETL combination as above. White EL spectral distribution is facilely tunable simply by varying ZCGS-to-CIS QD content ratio in the EML of white EL device. The optimum white QLED not only generates the peak quantities of 2172  cd/m2 in luminance and 4.6% in EQE, corresponding to the record values ever reported in non-Cd white EL devices, but exhibits high color rendering index up to 82.
URI
http://pubs.kist.re.kr/handle/201004/69749
ISSN
2211-2855
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KIST Publication > Article
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