White LEDs with CIS-ZnS quantum dots

Chen, Wu-Chi; Chen, Changan; Lin, Nan-Ming; Lyu, Jia-Huei; Liu, Yizhen; Li, Cheng-Sun; Wu, Bo-Yi; Shei, Shih–Chang

doi:10.1109/isne.2016.7543303

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…It can be concluded that the PL from the elongated anisotropic structures predominates the total emission of the whole batch of the sample. The gradually improved PL properties can be interpreted to be due to the surface passivation effect of the ZnS shell upon the surface defects which can act as a nonradiative pathway [39][40][41] . PL decay curve of the final Cu-In-(Zn)-S/ZnS "ice-cream cone" structure, which was biexponentially fitted is shown in Fig.…”

Section: Spectroscopic Characterizationmentioning

confidence: 99%

Photoluminescent, “ice-cream cone” like Cu–In–(Zn)–S/ZnS nanoheterostructures

Bai

Purcell-Milton

Kehoe

et al. 2022

Sci Rep

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Copper based ternary and quaternary quantum confined nanostructures have attracted huge attention over recent years due to their potential applications in photonics, photovoltaics, imaging, sensing and other areas. However, anisotropic nanoheterostructures of this type are still poorly explored to date, despite numerous predictions of the distinctive optical properties of these highly fluorescent heavy metal free nanostructures. Here, we report new fluorescent multicomponent Cu–In–(Zn)–S/ZnS nanoheterostructures with a unique anisotropic “ice-cream cone” like morphology. These nanostructures have been prepared with a seeded growth technique and exhibit distinct photophysical properties with maximum emission in the visible range (≈ 640 nm) and long photoluminescence lifetimes (τaverage ≥ 300 ns). In depth time interval studies have been carried out to better understand the step by step growth mechanism of this distinct “ice-cream cone” like geometry. We have demonstrated that the crystal structure evolution from the zinc blende Cu–In–S core to the wurtzite “ice cream cone” like Cu–In–(Zn)–S/ZnS nanocrystals plays a key role in the origin of this morphology. This research opens new possibilities to produce unique fluorescent Cu-based multicomponent anisotropic heteronanostructures, while also offering a distinctive insight into the design of bespoke nanostructures, which could find a range of potential applications.

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Section: Spectroscopic Characterizationmentioning

confidence: 99%

Photoluminescent, “ice-cream cone” like Cu–In–(Zn)–S/ZnS nanoheterostructures

Bai

Purcell-Milton

Kehoe

et al. 2022

Sci Rep

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“…Secondly, the absence of toxic heavy metals (Cd or Pb) in Cu-based ternary or quaternary QDs shows particular advantages due to reduced environmental impact and better suitability for biological applications. Thirdly, Cu-based multicomponent QDs possess enhanced stability against the external environment (oxygen, moisture, and photo-irradiation), especially after inorganic shell coating with large band gap semiconductors, such as ZnS [10,11,12]. Thus, Cu-based multicomponent QDs are very promising candidates to replace Cd-based QDs.…”

Section: Introductionmentioning

confidence: 99%

Optical Properties, Synthesis, and Potential Applications of Cu-Based Ternary or Quaternary Anisotropic Quantum Dots, Polytypic Nanocrystals, and Core/Shell Heterostructures

2019

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This review summaries the optical properties, recent progress in synthesis, and a range of applications of luminescent Cu-based ternary or quaternary quantum dots (QDs). We first present the unique optical properties of the Cu-based multicomponent QDs, regarding their emission mechanism, high photoluminescent quantum yields (PLQYs), size-dependent bandgap, composition-dependent bandgap, broad emission range, large Stokes’ shift, and long photoluminescent (PL) lifetimes. Huge progress has taken place in this area over the past years, via detailed experimenting and modelling, giving a much more complete understanding of these nanomaterials and enabling the means to control and therefore take full advantage of their important properties. We then fully explore the techniques to prepare the various types of Cu-based ternary or quaternary QDs (including anisotropic nanocrystals (NCs), polytypic NCs, and spherical, nanorod and tetrapod core/shell heterostructures) are introduced in subsequent sections. To date, various strategies have been employed to understand and control the QDs distinct and new morphologies, with the recent development of Cu-based nanorod and tetrapod structure synthesis highlighted. Next, we summarize a series of applications of these luminescent Cu-based anisotropic and core/shell heterostructures, covering luminescent solar concentrators (LSCs), bioimaging and light emitting diodes (LEDs). Finally, we provide perspectives on the overall current status, challenges, and future directions in this field. The confluence of advances in the synthesis, properties, and applications of these Cu-based QDs presents an important opportunity to a wide-range of fields and this piece gives the reader the knowledge to grasp these exciting developments.

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White LEDs with CIS-ZnS quantum dots

Cited by 2 publications

References 8 publications

Photoluminescent, “ice-cream cone” like Cu–In–(Zn)–S/ZnS nanoheterostructures

Photoluminescent, “ice-cream cone” like Cu–In–(Zn)–S/ZnS nanoheterostructures

Optical Properties, Synthesis, and Potential Applications of Cu-Based Ternary or Quaternary Anisotropic Quantum Dots, Polytypic Nanocrystals, and Core/Shell Heterostructures

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