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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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Organically tuned white-light emission from two zero-dimensional Cd-based hybrids.

Rawia Msalmi1, Slim Elleuch2, Besma Hamdi3

  • 1Laboratory of Physico Chemistry of the Solid State, Department of Chemistry, Faculty of Sciences of Sfax, Sfax University Sfax Tunisia houcine_naili@yahoo.com.

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|April 15, 2022
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Two novel cadmium-based hybrid compounds, CdACP and CdODA, exhibit wide-gap semiconductor properties and tunable white-light emission. CdACP shows both fluorescence and phosphorescence, while CdODA displays ultra-fast fluorescence via excited-state proton transfer.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Photophysics

Background:

  • Wide-gap semiconductors are crucial for optoelectronic devices.
  • Developing novel materials with tunable luminescence is an active research area.
  • Understanding structure-property relationships in hybrid compounds is key to designing advanced materials.

Purpose of the Study:

  • To synthesize and characterize two new zero-dimensional (0D) cadmium-based hybrid compounds, CdACP and CdODA.
  • To investigate their optical properties, including photoluminescence and white-light emission mechanisms.
  • To explore the correlation between their structural features and observed optoelectronic behavior.

Main Methods:

  • Synthesis of CdACP and CdODA via chemical methods.
  • Optical analysis including photoluminescence spectroscopy.
  • Structural characterization to understand bonding and geometry.
  • Investigation of heavy halide and proton transfer effects on luminescence.

Main Results:

  • CdACP and CdODA were synthesized, featuring tetrahedral Cd atoms.
  • Both compounds are wide-gap semiconductors with wavelength-dependent white-light emission.
  • CdACP exhibits fluorescence and room-temperature phosphorescence (RTP) due to the heavy halide effect and triplet state harvesting.
  • CdODA shows ultra-fast fluorescence via excited-state intramolecular proton transfer (ESIPT) facilitated by specific intermolecular interactions.
  • Under sub-gap excitation, distinct blue-green (inorganic) and red (organic) emissions were observed.

Conclusions:

  • The synthesized Cd-based hybrid compounds are promising for optoelectronic applications.
  • The distinct emission mechanisms in CdACP (phosphorescence) and CdODA (ESIPT fluorescence) offer pathways for tailored light-emitting materials.
  • Structural insights, including heavy halide effects and proton transfer, are critical for controlling photoluminescence properties.