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Multimodal luminescence properties of surface-treated ZnSe quantum dots by Eu

Title
Multimodal luminescence properties of surface-treated ZnSe quantum dots by Eu
Author
좌용호
Keywords
ZnSe; Eu; Multimodal; Doping; Dangling bond; RAPID SYNTHESIS; ENERGY-TRANSFER; NANOPARTICLES; NANOCRYSTALS; COMPLEXES; ZNO
Issue Date
2017-09
Publisher
ELSEVIER SCIENCE BV
Citation
APPLIED SURFACE SCIENCE, v. 415, Page. 8-13
Abstract
ZnSe: Eu quantum dots (QDs) were synthesized using the heating-up method by adding a Eu precursor in Zn and Se precursors. The optical property was investigated based on the change in the multimodal emission caused by increasing the amount of the Eu precursor. The emission wavelength of ZnSe QDs increased from 398 nm to 405 nm when the reaction was carried out for 30-300s. The broad spectrum was attributed to the (F6D1)-F-4-D-5 -˃ F-4(7) transition when the Eu2+ emission was increased from 450 to 550 nm. Eu3+ shows characteristic red emission peaks at 579, 592, 615, 651, and 700 nm owing to the electronic transition of D-5(0)-˃ F-7(j) (j = 0, 1, 2, 3, 4). The expected structure of the ZnSe: Eu QDs was verified by XRD, TEM, and XPS. Compared to the diffraction peaks of pristine ZnSe, the corresponding peaks for the ZnSe: Eu QDs are shifted, by about 0.43 degrees, to larger angles, because the ionic radius of Eu3+ (0.95 angstrom) is larger than that of Zn2+ (0.74 angstrom). They also have Eu2+-O and Eu3+-O dangling bonds on the surface of Eu3+- doped ZnSe QDs, with an average size of about 3.15 nm. These semiconductor QDs with rare earth elements are promising candidates to fabricate light-converting materials. (C) 2017 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S016943321730377Xhttps://repository.hanyang.ac.kr/handle/20.500.11754/72380
ISSN
0169-4332; 1873-5584
DOI
10.1016/j.apsusc.2017.02.026
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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