TY - JOUR
T1 - Layer Number-Dependent Enhanced Photoluminescence from a Quantum Dot Metamaterial Optical Resonator
AU - Takekuma, Haruka
AU - Leng, Junfu
AU - Tateishi, Kazutaka
AU - Xu, Yang
AU - Chan, Yinthai
AU - Ryuzaki, Sou
AU - Wang, Pangpang
AU - Okamoto, Koichi
AU - Tamada, Kaoru
N1 - Funding Information:
This work was supported by JSPS KAKENHI grant number 19H05627 in Japan. This work was performed under the Singapore-Japan joint research project (JSPS/NUS).
Funding Information:
This work was supported by JSPS KAKENHI grant number 19H05627 in Japan. This work was performed under the Singapore–Japan joint research project (JSPS/NUS).
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/1/26
Y1 - 2021/1/26
N2 - High-density colloidal quantum dot (QD) thin films are promising materials for optoelectronic devices. Our experimental data revealed a unique layer number-dependent photoluminescence (PL) from multilayered QDs on a gold substrate. Compared with the PL intensity of QDs on glass substrates, the PL intensity of CdSe/ZnS QD multilayers on the gold substrate was enhanced approximately 10-fold with 6 layers (film thickness: 42 nm). This phenomenon was simply and reasonably explained by an optical simulation using the finite-difference time-domain method with the effective medium approximation, where the light confinement effect of the high-refractive index QD film acting as a "metamaterial optical resonator"was considered together with a long-range exciton-surface plasmon coupling and mirror effects. This result explains the QD film properties from both quantum physics and optical metamaterial viewpoints. This finding is important for the design of high-luminescence thin-film displays composed of condensed QD films.
AB - High-density colloidal quantum dot (QD) thin films are promising materials for optoelectronic devices. Our experimental data revealed a unique layer number-dependent photoluminescence (PL) from multilayered QDs on a gold substrate. Compared with the PL intensity of QDs on glass substrates, the PL intensity of CdSe/ZnS QD multilayers on the gold substrate was enhanced approximately 10-fold with 6 layers (film thickness: 42 nm). This phenomenon was simply and reasonably explained by an optical simulation using the finite-difference time-domain method with the effective medium approximation, where the light confinement effect of the high-refractive index QD film acting as a "metamaterial optical resonator"was considered together with a long-range exciton-surface plasmon coupling and mirror effects. This result explains the QD film properties from both quantum physics and optical metamaterial viewpoints. This finding is important for the design of high-luminescence thin-film displays composed of condensed QD films.
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U2 - 10.1021/acsaelm.0c01011
DO - 10.1021/acsaelm.0c01011
M3 - Article
AN - SCOPUS:85099931462
SN - 2637-6113
VL - 3
SP - 468
EP - 475
JO - ACS Applied Electronic Materials
JF - ACS Applied Electronic Materials
IS - 1
ER -