TY - GEN
T1 - Fabrication of high quantum yield of CIS/ZnS quantum dots
AU - Chang, C. W.
AU - Wang, K. W.
AU - Chung, S. R.
N1 - Publisher Copyright:
© 2018 SPIE.
PY - 2018
Y1 - 2018
N2 - Semiconductor quantum dots (QDs) are emerging luminescent nanomaterials. It can be used in solid-state lighting (SSL), display, solar cells and biomedical imaging due to the exhibit excellent wavelength tunability, large excitation range, consistent particle size and high quantum efficiency. In solid state lighting, white light-emitting diodes (LEDs) are often made by using QDs such as CdSe or ZnCdSe. However, cadmium-based QDs have limited future applications owing to the well-known toxicity. Recently, cadmium-free luminescent materials-CuInS2/ZnS (CIS/ZnS) core/shell QDs are investigated. The CIS/ZnS QDs exhibit very broad emission spectrum, large Stoke's shift, and tunable emission wavelengths. Those properties make the CIS/ZnS QDs suitable for solid-state lighting application. In this study, CIS QDs with molar ratio of Cu:In is equal to 1:4, and the ZnS shell was produced by different shell sulfide precursors, such as dodecanethiol (DDT), octadecanethiol (ODT) and sulfur (S) powders. The optical properties, morphologies, and crystal structure are analysis by fluorescence spectrometer, UV-Vis spectrometer, transmission electron microscopy, and X-ray diffractometer, respectively. The results show that the emission wavelength and quantum yield (QY) of CIS/ZnSDDT, CIS/ZnSODT, and CIS/ZnSS are 549 nm, 76 %, 548 nm, 82 %, and 538 nm, 83 %, respectively. The structure of CIS/ZnS QD belongs to chalcopyrite phase and the average particle size is 3.2 nm. Moreover, the stability of CIS/ZnS QDs is excellent.
AB - Semiconductor quantum dots (QDs) are emerging luminescent nanomaterials. It can be used in solid-state lighting (SSL), display, solar cells and biomedical imaging due to the exhibit excellent wavelength tunability, large excitation range, consistent particle size and high quantum efficiency. In solid state lighting, white light-emitting diodes (LEDs) are often made by using QDs such as CdSe or ZnCdSe. However, cadmium-based QDs have limited future applications owing to the well-known toxicity. Recently, cadmium-free luminescent materials-CuInS2/ZnS (CIS/ZnS) core/shell QDs are investigated. The CIS/ZnS QDs exhibit very broad emission spectrum, large Stoke's shift, and tunable emission wavelengths. Those properties make the CIS/ZnS QDs suitable for solid-state lighting application. In this study, CIS QDs with molar ratio of Cu:In is equal to 1:4, and the ZnS shell was produced by different shell sulfide precursors, such as dodecanethiol (DDT), octadecanethiol (ODT) and sulfur (S) powders. The optical properties, morphologies, and crystal structure are analysis by fluorescence spectrometer, UV-Vis spectrometer, transmission electron microscopy, and X-ray diffractometer, respectively. The results show that the emission wavelength and quantum yield (QY) of CIS/ZnSDDT, CIS/ZnSODT, and CIS/ZnSS are 549 nm, 76 %, 548 nm, 82 %, and 538 nm, 83 %, respectively. The structure of CIS/ZnS QD belongs to chalcopyrite phase and the average particle size is 3.2 nm. Moreover, the stability of CIS/ZnS QDs is excellent.
KW - Cadmium-Free Material
KW - CuInS2/ZnS QDs
KW - Solid-State Lighting
KW - Stability
KW - Sulfide Precursors
UR - http://www.scopus.com/inward/record.url?scp=85055469817&partnerID=8YFLogxK
U2 - 10.1117/12.2320456
DO - 10.1117/12.2320456
M3 - 會議論文篇章
AN - SCOPUS:85055469817
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Physical Chemistry of Semiconductor Materials and Interfaces XVII
A2 - Bronstein, Hugo A.
A2 - Deschler, Felix
A2 - Kirchartz, Thomas
PB - SPIE
T2 - Physical Chemistry of Semiconductor Materials and Interfaces XVII 2018
Y2 - 20 August 2018 through 23 August 2018
ER -