Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/629041
Title: Tunable optical properties of ternary non-stoichiometric Cu&x2013;In&x2013;S nanocrystal emitters
Authors: Guangwei Feng;Jian Feng
subject: CuInS<sub>2</sub>|XRD|relative photoluminescence quantum yield|X-ray powder diffraction|single-crystal nature|high-resolution transmission electron microscopy|low toxic nonstoichiometric colloidal copper-indium-sulphur ternary quantum dots|tunable optical properties|ternary nonstoichiometric Cu-In-S nanocrystal emitters|bandgap engineering|HRTEM|octadecene|surface-related trap states|cationic agent|tunable photoluminescence emissions|hot-injection method|Cu-In precursor molar ratios|compositional homogeneity|average photoluminescence lifetime|capping agent|time 146.9 ns|photoluminescence decay curve
Year: 2016
Publisher: IEEE
Abstract: Low toxic, non-stoichiometric colloidal copper-indium-sulphur [Cu-In-S (CIS)] ternary quantum dots with different Cu:In molar ratios by a hot-injection method in octadecene was synthesised. The Cu:In precursor molar ratios were 1/10, 1/20 and 1/40. Varying the fraction of cationic and capping agents, the compositions of CIS nanocrystals were precisely controlled. The photoluminescence (PL) results reveal that, reducing the Cu:In ratio in the CIS is the feasible strategy for bandgap engineering. Tunable PL emissions have been observed. X-ray powder diffraction and high-resolution transmission electron microscopy results indicate that as-prepared CIS nanocrystals are compositional homogeneity. The single-crystal nature of CIS nanocrystals improves the relative PL quantum yield up to 12%, which exhibits substantial enhancement comparing with the stoichiometric CuInS<sub>2</sub> and CIS-based semiconductor core QDs. The PL decay curve of CIS has a triexponential feature. The value of <i>&#x03C4;</i>1, <i>&#x03C4;</i>2 and <i>&#x03C4;</i>3 of CIS sample agree well with CuInS<sub>2</sub> core QDs. The average PL lifetime of CIS is reduced to 146.9 ns, which can be attributed to the reduction of surface-related trap states.
Description: 
URI: http://localhost/handle/Hannan/181049
http://localhost/handle/Hannan/629041
ISSN: 1750-0443
volume: 11
issue: 9
Appears in Collections:2016

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Title: Tunable optical properties of ternary non-stoichiometric Cu&x2013;In&x2013;S nanocrystal emitters
Authors: Guangwei Feng;Jian Feng
subject: CuInS<sub>2</sub>|XRD|relative photoluminescence quantum yield|X-ray powder diffraction|single-crystal nature|high-resolution transmission electron microscopy|low toxic nonstoichiometric colloidal copper-indium-sulphur ternary quantum dots|tunable optical properties|ternary nonstoichiometric Cu-In-S nanocrystal emitters|bandgap engineering|HRTEM|octadecene|surface-related trap states|cationic agent|tunable photoluminescence emissions|hot-injection method|Cu-In precursor molar ratios|compositional homogeneity|average photoluminescence lifetime|capping agent|time 146.9 ns|photoluminescence decay curve
Year: 2016
Publisher: IEEE
Abstract: Low toxic, non-stoichiometric colloidal copper-indium-sulphur [Cu-In-S (CIS)] ternary quantum dots with different Cu:In molar ratios by a hot-injection method in octadecene was synthesised. The Cu:In precursor molar ratios were 1/10, 1/20 and 1/40. Varying the fraction of cationic and capping agents, the compositions of CIS nanocrystals were precisely controlled. The photoluminescence (PL) results reveal that, reducing the Cu:In ratio in the CIS is the feasible strategy for bandgap engineering. Tunable PL emissions have been observed. X-ray powder diffraction and high-resolution transmission electron microscopy results indicate that as-prepared CIS nanocrystals are compositional homogeneity. The single-crystal nature of CIS nanocrystals improves the relative PL quantum yield up to 12%, which exhibits substantial enhancement comparing with the stoichiometric CuInS<sub>2</sub> and CIS-based semiconductor core QDs. The PL decay curve of CIS has a triexponential feature. The value of <i>&#x03C4;</i>1, <i>&#x03C4;</i>2 and <i>&#x03C4;</i>3 of CIS sample agree well with CuInS<sub>2</sub> core QDs. The average PL lifetime of CIS is reduced to 146.9 ns, which can be attributed to the reduction of surface-related trap states.
Description: 
URI: http://localhost/handle/Hannan/181049
http://localhost/handle/Hannan/629041
ISSN: 1750-0443
volume: 11
issue: 9
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7560060.pdf269.29 kBAdobe PDFThumbnail
Preview File
Title: Tunable optical properties of ternary non-stoichiometric Cu&x2013;In&x2013;S nanocrystal emitters
Authors: Guangwei Feng;Jian Feng
subject: CuInS<sub>2</sub>|XRD|relative photoluminescence quantum yield|X-ray powder diffraction|single-crystal nature|high-resolution transmission electron microscopy|low toxic nonstoichiometric colloidal copper-indium-sulphur ternary quantum dots|tunable optical properties|ternary nonstoichiometric Cu-In-S nanocrystal emitters|bandgap engineering|HRTEM|octadecene|surface-related trap states|cationic agent|tunable photoluminescence emissions|hot-injection method|Cu-In precursor molar ratios|compositional homogeneity|average photoluminescence lifetime|capping agent|time 146.9 ns|photoluminescence decay curve
Year: 2016
Publisher: IEEE
Abstract: Low toxic, non-stoichiometric colloidal copper-indium-sulphur [Cu-In-S (CIS)] ternary quantum dots with different Cu:In molar ratios by a hot-injection method in octadecene was synthesised. The Cu:In precursor molar ratios were 1/10, 1/20 and 1/40. Varying the fraction of cationic and capping agents, the compositions of CIS nanocrystals were precisely controlled. The photoluminescence (PL) results reveal that, reducing the Cu:In ratio in the CIS is the feasible strategy for bandgap engineering. Tunable PL emissions have been observed. X-ray powder diffraction and high-resolution transmission electron microscopy results indicate that as-prepared CIS nanocrystals are compositional homogeneity. The single-crystal nature of CIS nanocrystals improves the relative PL quantum yield up to 12%, which exhibits substantial enhancement comparing with the stoichiometric CuInS<sub>2</sub> and CIS-based semiconductor core QDs. The PL decay curve of CIS has a triexponential feature. The value of <i>&#x03C4;</i>1, <i>&#x03C4;</i>2 and <i>&#x03C4;</i>3 of CIS sample agree well with CuInS<sub>2</sub> core QDs. The average PL lifetime of CIS is reduced to 146.9 ns, which can be attributed to the reduction of surface-related trap states.
Description: 
URI: http://localhost/handle/Hannan/181049
http://localhost/handle/Hannan/629041
ISSN: 1750-0443
volume: 11
issue: 9
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7560060.pdf269.29 kBAdobe PDFThumbnail
Preview File