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<p>Environment friendly CuInS<sub>2</sub> (CIS) quantum dots (QDs) are synthesized by the hydrothermal method using 3-mercaptopropionic acid (MPA) as a stabilizer. XRD studies of CIS QDs show chalcopyrite tetragonal structure, which is further confirmed by Raman spectroscopy. HRTEM analysis shows average particle size around 6.1&#xa0;nm and inter planar spacing of 0.31&#xa0;nm corresponding to (1 1 2) lattice plane of CIS QDs. XPS analysis provides insight into surface elemental analysis and oxidation states of CIS QDs. Optical properties are enhanced by varying parameters such as Cu: MPA concentration, Cu:In ratio, reaction time, pH, and reaction temperature. The bandgap determined from Tauc’s plot varied from 1.18 to 2.55&#xa0;eV, confirming the strong quantum confinement effect. Chromaticity coordinates for CIS QDs were calculated using CIE-1931, and the coordinate shows orange-red color emission of CIS QDs. Variation of Urbach energy and fluorescence quantum yield (FQY) of the material as a function of various reaction parameters is studied to obtain defect-free highly fluorescent QDs. The study revealed a strong correlation between Urbach energy and FQY. Maximum FQY of 19.68% is achieved for CIS QDs of molar ratio 1:8. Excitation wavelength independent and intensity-dependent emission behavior demonstrates stable and tunable radiative recombination. The material also showed excellent photostability under prolonged irradiation of visible light. These findings establish MPA-capped CIS QDs as promising, eco-friendly wavelength converters for potential application in next-generation light-emitting diodes (LEDs) and other optoelectronic devices.</p>

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Photostable CuInS2 quantum dots with excitation independent emission

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Sushma,
  • V. Ramaraja Varma,
  • Mohan Kumar,
  • K. N. Shruthi,
  • G. K. Sahana,
  • Ganesh Sanjeev

摘要

Environment friendly CuInS2 (CIS) quantum dots (QDs) are synthesized by the hydrothermal method using 3-mercaptopropionic acid (MPA) as a stabilizer. XRD studies of CIS QDs show chalcopyrite tetragonal structure, which is further confirmed by Raman spectroscopy. HRTEM analysis shows average particle size around 6.1 nm and inter planar spacing of 0.31 nm corresponding to (1 1 2) lattice plane of CIS QDs. XPS analysis provides insight into surface elemental analysis and oxidation states of CIS QDs. Optical properties are enhanced by varying parameters such as Cu: MPA concentration, Cu:In ratio, reaction time, pH, and reaction temperature. The bandgap determined from Tauc’s plot varied from 1.18 to 2.55 eV, confirming the strong quantum confinement effect. Chromaticity coordinates for CIS QDs were calculated using CIE-1931, and the coordinate shows orange-red color emission of CIS QDs. Variation of Urbach energy and fluorescence quantum yield (FQY) of the material as a function of various reaction parameters is studied to obtain defect-free highly fluorescent QDs. The study revealed a strong correlation between Urbach energy and FQY. Maximum FQY of 19.68% is achieved for CIS QDs of molar ratio 1:8. Excitation wavelength independent and intensity-dependent emission behavior demonstrates stable and tunable radiative recombination. The material also showed excellent photostability under prolonged irradiation of visible light. These findings establish MPA-capped CIS QDs as promising, eco-friendly wavelength converters for potential application in next-generation light-emitting diodes (LEDs) and other optoelectronic devices.