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Switching of BJT01:22

Switching of BJT

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Updated: Nov 9, 2025

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Modulating Charge Separation and Intersystem Crossing in Donor-Switch-Acceptor Systems: A Computational Study.

Yuanyuan Chong1, Xiaolong Zhang1, Biao Chen1

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.

The Journal of Physical Chemistry. A
|April 8, 2021
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Summary
This summary is machine-generated.

Organic photoswitches control charge separation and intersystem crossing in donor-switch-acceptor systems. This azobenzene switch design enhances organic long persistent luminescence for advanced electronic and biomedical applications.

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Area of Science:

  • Organic electronics
  • Photochemistry
  • Materials science

Background:

  • Charge separation and intersystem crossing are crucial for organic long persistent luminescence (OLPL) materials used in LEDs, sensors, and biomedical applications.
  • Tailoring molecular configurations is key to optimizing these processes for enhanced material performance.

Purpose of the Study:

  • To investigate the use of an azobenzene photoswitch within a donor-switch-acceptor (D-S-A) system to control charge separation and intersystem crossing.
  • To theoretically demonstrate how molecular configuration changes influence OLPL properties.

Main Methods:

  • First-principles calculations were employed to model the D-S-A molecular system.
  • The study focused on the photoisomerization of the azobenzene switch from trans to cis conformation.

Main Results:

  • Azobenzene photoisomerization creates an electron trap, stabilizing the charge-separated state.
  • The cis conformation of the azobenzene switch promotes singlet to triplet intersystem crossing in the excited state.
  • The D-S-A system's configuration directly impacts charge separation and intersystem crossing efficiency.

Conclusions:

  • Azobenzene photoswitches can effectively modulate charge separation and intersystem crossing in D-S-A systems.
  • This theoretical approach provides a pathway for designing advanced organic long persistent luminescent devices.
  • The findings offer insights into molecular engineering for optoelectronic and biomedical applications.