Heterointerface Effects on Carrier Dynamics in Colloidal Quantum Dots and Their Application to Light-Emitting Diodes

Authors
Sung Hun KimJi-Yeon KimSon, Dong IckHong Seok Lee
Issue Date
2024-05
Publisher
American Chemical Society
Citation
ACS Applied Materials & Interfaces, v.16, no.19, pp.25511 - 25518
Abstract
Colloidal quantum dots (QDs) are promising candidates for next-generation display technology because of their unique optical properties and have already appeared in the market as a high-end product. On the basis of their extraordinary properties, QD emissions with a given chemical composition can be tailored in a wide spectral window due to quantum size effects, which constitutes a key advantage of QDs in the display field. Specifically, investigations of structure-dependent and composition-dependent characterizations outside the quantum confinement effect have become an important part of practical applications. Therefore, from the perspective of designing nanostructures with well-defined heterointerfaces, strong quantum confinement effects with effective carrier confinement are desirable. Our results show that the photoluminescence (PL) intensity of CdSe/CdZnS core?shell QDs was enhanced 5.7 times compared with that of the CdSe core QDs. Supplementary analytical techniques involving transmission electron microscopy revealed the heterointerface configuration and composition distribution of the core and shell materials. The effects of the heterointerface on carrier dynamics in core?shell QDs were revealed by monitoring wavelength-dependent time-resolved PL. To further develop the QD light-emitting diodes (QD-LEDs), we produced an all-solution processed inverted QD-LEDs using CdSe/CdZnS core?shell QDs as the emitter. The electroluminescence spectrum of deep-red emissive QD-LEDs with CIE chromaticity coordinates of (0.68, 0.32) exhibited a peak at 638 nm.
Keywords
heterointerface effects; wavelength dependent time-resolvedphotoluminescence; quantum dot light-emitting diodes; colloidal quantum dots; core-shell heterostructures
ISSN
1944-8244
URI
https://pubs.kist.re.kr/handle/201004/149812
DOI
10.1021/acsami.4c01325
Appears in Collections:
KIST Article > 2024
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